diff --git a/lib/tsc.js b/lib/tsc.js
index 97db13aa62a50..ab79f9e91feec 100644
--- a/lib/tsc.js
+++ b/lib/tsc.js
@@ -69,7 +69,7 @@ var __generator = (this && this.__generator) || function (thisArg, body) {
 var ts;
 (function (ts) {
     ts.versionMajorMinor = "4.8";
-    ts.version = "4.8.2";
+    ts.version = "4.8.3";
     var NativeCollections;
     (function (NativeCollections) {
         var globals = typeof globalThis !== "undefined" ? globalThis :
@@ -6031,7 +6031,7 @@ var ts;
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_node_Try_npm_i_save_dev_types_Slashnode_and_then_add_node_to_the_types_field_in_your_tsconfig: diag(2591, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_node_Try_npm_i_save_dev_types_Slashno_2591", "Cannot find name '{0}'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node` and then add 'node' to the types field in your tsconfig."),
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_jQuery_Try_npm_i_save_dev_types_Slashjquery_and_then_add_jquery_to_the_types_field_in_your_tsconfig: diag(2592, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_jQuery_Try_npm_i_save_dev_types_Slash_2592", "Cannot find name '{0}'. Do you need to install type definitions for jQuery? Try `npm i --save-dev @types/jquery` and then add 'jquery' to the types field in your tsconfig."),
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_a_test_runner_Try_npm_i_save_dev_types_Slashjest_or_npm_i_save_dev_types_Slashmocha_and_then_add_jest_or_mocha_to_the_types_field_in_your_tsconfig: diag(2593, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_a_test_runner_Try_npm_i_save_dev_type_2593", "Cannot find name '{0}'. Do you need to install type definitions for a test runner? Try `npm i --save-dev @types/jest` or `npm i --save-dev @types/mocha` and then add 'jest' or 'mocha' to the types field in your tsconfig."),
-        This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag: diag(2594, ts.DiagnosticCategory.Error, "This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the__2594", "This module is declared with using 'export =', and can only be used with a default import when using the '{0}' flag."),
+        This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag: diag(2594, ts.DiagnosticCategory.Error, "This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag_2594", "This module is declared with 'export =', and can only be used with a default import when using the '{0}' flag."),
         _0_can_only_be_imported_by_using_a_default_import: diag(2595, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_using_a_default_import_2595", "'{0}' can only be imported by using a default import."),
         _0_can_only_be_imported_by_turning_on_the_esModuleInterop_flag_and_using_a_default_import: diag(2596, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_turning_on_the_esModuleInterop_flag_and_using_a_default_import_2596", "'{0}' can only be imported by turning on the 'esModuleInterop' flag and using a default import."),
         _0_can_only_be_imported_by_using_a_require_call_or_by_using_a_default_import: diag(2597, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_using_a_require_call_or_by_using_a_default_import_2597", "'{0}' can only be imported by using a 'require' call or by using a default import."),
@@ -36545,7 +36545,7 @@ var ts;
                 var _a, _b;
                 if (path === undefined)
                     return path;
-                return ts.hostGetCanonicalFileName({ useCaseSensitiveFileNames: useCaseSensitiveFileNames })(ts.getNormalizedAbsolutePath(path, (_b = (_a = state.host).getCurrentDirectory) === null || _b === void 0 ? void 0 : _b.call(_a)));
+                return ts.getNormalizedAbsolutePath(path, (_b = (_a = state.host).getCurrentDirectory) === null || _b === void 0 ? void 0 : _b.call(_a));
             }
             function combineDirectoryPath(root, dir) {
                 return ts.ensureTrailingDirectorySeparator(ts.combinePaths(root, dir));
@@ -36560,7 +36560,7 @@ var ts;
                 if ((extensions === Extensions.TypeScript || extensions === Extensions.JavaScript || extensions === Extensions.Json)
                     && (state.compilerOptions.declarationDir || state.compilerOptions.outDir)
                     && finalPath.indexOf("/node_modules/") === -1
-                    && (state.compilerOptions.configFile ? ts.startsWith(toAbsolutePath(state.compilerOptions.configFile.fileName), scope.packageDirectory) : true)) {
+                    && (state.compilerOptions.configFile ? ts.containsPath(scope.packageDirectory, toAbsolutePath(state.compilerOptions.configFile.fileName), !useCaseSensitiveFileNames()) : true)) {
                     var getCanonicalFileName = ts.hostGetCanonicalFileName({ useCaseSensitiveFileNames: useCaseSensitiveFileNames });
                     var commonSourceDirGuesses = [];
                     if (state.compilerOptions.rootDir || (state.compilerOptions.composite && state.compilerOptions.configFilePath)) {
@@ -36590,7 +36590,7 @@ var ts;
                         var candidateDirectories = getOutputDirectoriesForBaseDirectory(commonSourceDirGuess);
                         for (var _e = 0, candidateDirectories_1 = candidateDirectories; _e < candidateDirectories_1.length; _e++) {
                             var candidateDir = candidateDirectories_1[_e];
-                            if (ts.startsWith(finalPath, candidateDir)) {
+                            if (ts.containsPath(candidateDir, finalPath, !useCaseSensitiveFileNames())) {
                                 var pathFragment = finalPath.slice(candidateDir.length + 1);
                                 var possibleInputBase = ts.combinePaths(commonSourceDirGuess, pathFragment);
                                 var jsAndDtsExtensions = [".mjs", ".cjs", ".js", ".json", ".d.mts", ".d.cts", ".d.ts"];
@@ -41875,40 +41875,60 @@ var ts;
             return typeof file.externalModuleIndicator !== "object" && !resolveExportByName(moduleSymbol, ts.escapeLeadingUnderscores("__esModule"), undefined, dontResolveAlias);
         }
         function getTargetOfImportClause(node, dontResolveAlias) {
-            var _a;
             var moduleSymbol = resolveExternalModuleName(node, node.parent.moduleSpecifier);
             if (moduleSymbol) {
-                var exportDefaultSymbol = void 0;
-                if (ts.isShorthandAmbientModuleSymbol(moduleSymbol)) {
-                    exportDefaultSymbol = moduleSymbol;
-                }
-                else {
-                    exportDefaultSymbol = resolveExportByName(moduleSymbol, "default", node, dontResolveAlias);
-                }
-                var file = (_a = moduleSymbol.declarations) === null || _a === void 0 ? void 0 : _a.find(ts.isSourceFile);
-                var hasDefaultOnly = isOnlyImportedAsDefault(node.parent.moduleSpecifier);
-                var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias, node.parent.moduleSpecifier);
-                if (!exportDefaultSymbol && !hasSyntheticDefault && !hasDefaultOnly) {
-                    if (hasExportAssignmentSymbol(moduleSymbol)) {
-                        var compilerOptionName = moduleKind >= ts.ModuleKind.ES2015 ? "allowSyntheticDefaultImports" : "esModuleInterop";
-                        var exportEqualsSymbol = moduleSymbol.exports.get("export=");
-                        var exportAssignment = exportEqualsSymbol.valueDeclaration;
-                        var err = error(node.name, ts.Diagnostics.Module_0_can_only_be_default_imported_using_the_1_flag, symbolToString(moduleSymbol), compilerOptionName);
-                        if (exportAssignment) {
-                            ts.addRelatedInfo(err, ts.createDiagnosticForNode(exportAssignment, ts.Diagnostics.This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag, compilerOptionName));
-                        }
-                    }
-                    else {
-                        reportNonDefaultExport(moduleSymbol, node);
+                return getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias);
+            }
+        }
+        function getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias) {
+            var _a;
+            var exportDefaultSymbol;
+            if (ts.isShorthandAmbientModuleSymbol(moduleSymbol)) {
+                exportDefaultSymbol = moduleSymbol;
+            }
+            else {
+                exportDefaultSymbol = resolveExportByName(moduleSymbol, "default", node, dontResolveAlias);
+            }
+            var file = (_a = moduleSymbol.declarations) === null || _a === void 0 ? void 0 : _a.find(ts.isSourceFile);
+            var specifier = getModuleSpecifierForImportOrExport(node);
+            if (!specifier) {
+                return exportDefaultSymbol;
+            }
+            var hasDefaultOnly = isOnlyImportedAsDefault(specifier);
+            var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias, specifier);
+            if (!exportDefaultSymbol && !hasSyntheticDefault && !hasDefaultOnly) {
+                if (hasExportAssignmentSymbol(moduleSymbol)) {
+                    var compilerOptionName = moduleKind >= ts.ModuleKind.ES2015 ? "allowSyntheticDefaultImports" : "esModuleInterop";
+                    var exportEqualsSymbol = moduleSymbol.exports.get("export=");
+                    var exportAssignment = exportEqualsSymbol.valueDeclaration;
+                    var err = error(node.name, ts.Diagnostics.Module_0_can_only_be_default_imported_using_the_1_flag, symbolToString(moduleSymbol), compilerOptionName);
+                    if (exportAssignment) {
+                        ts.addRelatedInfo(err, ts.createDiagnosticForNode(exportAssignment, ts.Diagnostics.This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag, compilerOptionName));
                     }
                 }
-                else if (hasSyntheticDefault || hasDefaultOnly) {
-                    var resolved = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
-                    markSymbolOfAliasDeclarationIfTypeOnly(node, moduleSymbol, resolved, false);
-                    return resolved;
+                else if (ts.isImportClause(node)) {
+                    reportNonDefaultExport(moduleSymbol, node);
+                }
+                else {
+                    errorNoModuleMemberSymbol(moduleSymbol, moduleSymbol, node, ts.isImportOrExportSpecifier(node) && node.propertyName || node.name);
                 }
-                markSymbolOfAliasDeclarationIfTypeOnly(node, exportDefaultSymbol, undefined, false);
-                return exportDefaultSymbol;
+            }
+            else if (hasSyntheticDefault || hasDefaultOnly) {
+                var resolved = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
+                markSymbolOfAliasDeclarationIfTypeOnly(node, moduleSymbol, resolved, false);
+                return resolved;
+            }
+            markSymbolOfAliasDeclarationIfTypeOnly(node, exportDefaultSymbol, undefined, false);
+            return exportDefaultSymbol;
+        }
+        function getModuleSpecifierForImportOrExport(node) {
+            switch (node.kind) {
+                case 267: return node.parent.moduleSpecifier;
+                case 265: return ts.isExternalModuleReference(node.moduleReference) ? node.moduleReference.expression : undefined;
+                case 268: return node.parent.parent.moduleSpecifier;
+                case 270: return node.parent.parent.parent.moduleSpecifier;
+                case 275: return node.parent.parent.moduleSpecifier;
+                default: return ts.Debug.assertNever(node);
             }
         }
         function reportNonDefaultExport(moduleSymbol, node) {
@@ -41980,7 +42000,7 @@ var ts;
             }
         }
         function getExternalModuleMember(node, specifier, dontResolveAlias) {
-            var _a, _b;
+            var _a;
             if (dontResolveAlias === void 0) { dontResolveAlias = false; }
             var moduleSpecifier = ts.getExternalModuleRequireArgument(node) || node.moduleSpecifier;
             var moduleSymbol = resolveExternalModuleName(node, moduleSpecifier);
@@ -42014,29 +42034,33 @@ var ts;
                         combineValueAndTypeSymbols(symbolFromVariable, symbolFromModule) :
                         symbolFromModule || symbolFromVariable;
                     if (!symbol) {
-                        var moduleName = getFullyQualifiedName(moduleSymbol, node);
-                        var declarationName = ts.declarationNameToString(name);
-                        var suggestion = getSuggestedSymbolForNonexistentModule(name, targetSymbol);
-                        if (suggestion !== undefined) {
-                            var suggestionName = symbolToString(suggestion);
-                            var diagnostic = error(name, ts.Diagnostics._0_has_no_exported_member_named_1_Did_you_mean_2, moduleName, declarationName, suggestionName);
-                            if (suggestion.valueDeclaration) {
-                                ts.addRelatedInfo(diagnostic, ts.createDiagnosticForNode(suggestion.valueDeclaration, ts.Diagnostics._0_is_declared_here, suggestionName));
-                            }
-                        }
-                        else {
-                            if ((_b = moduleSymbol.exports) === null || _b === void 0 ? void 0 : _b.has("default")) {
-                                error(name, ts.Diagnostics.Module_0_has_no_exported_member_1_Did_you_mean_to_use_import_1_from_0_instead, moduleName, declarationName);
-                            }
-                            else {
-                                reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName);
-                            }
-                        }
+                        errorNoModuleMemberSymbol(moduleSymbol, targetSymbol, node, name);
                     }
                     return symbol;
                 }
             }
         }
+        function errorNoModuleMemberSymbol(moduleSymbol, targetSymbol, node, name) {
+            var _a;
+            var moduleName = getFullyQualifiedName(moduleSymbol, node);
+            var declarationName = ts.declarationNameToString(name);
+            var suggestion = getSuggestedSymbolForNonexistentModule(name, targetSymbol);
+            if (suggestion !== undefined) {
+                var suggestionName = symbolToString(suggestion);
+                var diagnostic = error(name, ts.Diagnostics._0_has_no_exported_member_named_1_Did_you_mean_2, moduleName, declarationName, suggestionName);
+                if (suggestion.valueDeclaration) {
+                    ts.addRelatedInfo(diagnostic, ts.createDiagnosticForNode(suggestion.valueDeclaration, ts.Diagnostics._0_is_declared_here, suggestionName));
+                }
+            }
+            else {
+                if ((_a = moduleSymbol.exports) === null || _a === void 0 ? void 0 : _a.has("default")) {
+                    error(name, ts.Diagnostics.Module_0_has_no_exported_member_1_Did_you_mean_to_use_import_1_from_0_instead, moduleName, declarationName);
+                }
+                else {
+                    reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName);
+                }
+            }
+        }
         function reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName) {
             var _a, _b;
             var localSymbol = (_b = (_a = moduleSymbol.valueDeclaration) === null || _a === void 0 ? void 0 : _a.locals) === null || _b === void 0 ? void 0 : _b.get(name.escapedText);
@@ -42082,6 +42106,13 @@ var ts;
             }
         }
         function getTargetOfImportSpecifier(node, dontResolveAlias) {
+            if (ts.isImportSpecifier(node) && ts.idText(node.propertyName || node.name) === "default") {
+                var specifier = getModuleSpecifierForImportOrExport(node);
+                var moduleSymbol = specifier && resolveExternalModuleName(node, specifier);
+                if (moduleSymbol) {
+                    return getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias);
+                }
+            }
             var root = ts.isBindingElement(node) ? ts.getRootDeclaration(node) : node.parent.parent.parent;
             var commonJSPropertyAccess = getCommonJSPropertyAccess(root);
             var resolved = getExternalModuleMember(root, commonJSPropertyAccess || node, dontResolveAlias);
@@ -42103,6 +42134,13 @@ var ts;
             return resolved;
         }
         function getTargetOfExportSpecifier(node, meaning, dontResolveAlias) {
+            if (ts.idText(node.propertyName || node.name) === "default") {
+                var specifier = getModuleSpecifierForImportOrExport(node);
+                var moduleSymbol = specifier && resolveExternalModuleName(node, specifier);
+                if (moduleSymbol) {
+                    return getTargetofModuleDefault(moduleSymbol, node, !!dontResolveAlias);
+                }
+            }
             var resolved = node.parent.parent.moduleSpecifier ?
                 getExternalModuleMember(node.parent.parent, node, dontResolveAlias) :
                 resolveEntityName(node.propertyName || node.name, meaning, false, dontResolveAlias);
@@ -51674,7 +51712,7 @@ var ts;
                 return includes & 8388608 ? wildcardType : anyType;
             }
             if (!strictNullChecks && includes & 98304) {
-                return includes & 32768 ? undefinedType : nullType;
+                return includes & 16777216 ? neverType : includes & 32768 ? undefinedType : nullType;
             }
             if (includes & 4 && includes & (128 | 134217728 | 268435456) ||
                 includes & 8 && includes & 256 ||
@@ -52309,7 +52347,7 @@ var ts;
                     type;
         }
         function distributeIndexOverObjectType(objectType, indexType, writing) {
-            if (objectType.flags & 3145728) {
+            if (objectType.flags & 1048576 || objectType.flags & 2097152 && !shouldDeferIndexType(objectType)) {
                 var types = ts.map(objectType.types, function (t) { return getSimplifiedType(getIndexedAccessType(t, indexType), writing); });
                 return objectType.flags & 2097152 || writing ? getIntersectionType(types) : getUnionType(types);
             }
@@ -54448,7 +54486,7 @@ var ts;
             if (reduced !== type) {
                 return reduced;
             }
-            if (type.flags & 2097152) {
+            if (type.flags & 2097152 && ts.some(type.types, isEmptyAnonymousObjectType)) {
                 var normalizedTypes = ts.sameMap(type.types, function (t) { return getNormalizedType(t, writing); });
                 if (normalizedTypes !== type.types) {
                     return getIntersectionType(normalizedTypes);
@@ -55432,7 +55470,7 @@ var ts;
                                 if (reportErrors && originalErrorInfo) {
                                     resetErrorInfo(saveErrorInfo);
                                 }
-                                if (result = isRelatedTo(source, constraint, 2, reportErrors)) {
+                                if (result = isRelatedTo(source, constraint, 2, reportErrors, undefined, intersectionState)) {
                                     return result;
                                 }
                                 if (reportErrors && originalErrorInfo && errorInfo) {
@@ -55495,8 +55533,8 @@ var ts;
                     if (!c.root.inferTypeParameters && !isDistributionDependent(c.root)) {
                         var skipTrue = !isTypeAssignableTo(getPermissiveInstantiation(c.checkType), getPermissiveInstantiation(c.extendsType));
                         var skipFalse = !skipTrue && isTypeAssignableTo(getRestrictiveInstantiation(c.checkType), getRestrictiveInstantiation(c.extendsType));
-                        if (result = skipTrue ? -1 : isRelatedTo(source, getTrueTypeFromConditionalType(c), 2, false)) {
-                            result &= skipFalse ? -1 : isRelatedTo(source, getFalseTypeFromConditionalType(c), 2, false);
+                        if (result = skipTrue ? -1 : isRelatedTo(source, getTrueTypeFromConditionalType(c), 2, false, undefined, intersectionState)) {
+                            result &= skipFalse ? -1 : isRelatedTo(source, getFalseTypeFromConditionalType(c), 2, false, undefined, intersectionState);
                             if (result) {
                                 return result;
                             }
@@ -59855,7 +59893,7 @@ var ts;
                 var narrowedPropType = narrowType(propType);
                 return filterType(type, function (t) {
                     var discriminantType = getTypeOfPropertyOrIndexSignature(t, propName);
-                    return !(narrowedPropType.flags & 131072) && isTypeComparableTo(narrowedPropType, discriminantType);
+                    return !(narrowedPropType.flags & 131072) && areTypesComparable(narrowedPropType, discriminantType);
                 });
             }
             function narrowTypeByDiscriminantProperty(type, access, operator, value, assumeTrue) {
@@ -59904,7 +59942,7 @@ var ts;
             }
             function narrowByInKeyword(type, name, assumeTrue) {
                 if (type.flags & 1048576
-                    || type.flags & 524288 && declaredType !== type
+                    || type.flags & 524288 && declaredType !== type && !(declaredType === unknownType && isEmptyAnonymousObjectType(type))
                     || ts.isThisTypeParameter(type)
                     || type.flags & 2097152 && ts.every(type.types, function (t) { return t.symbol !== globalThisSymbol; })) {
                     return filterType(type, function (t) { return isTypePresencePossible(t, name, assumeTrue); });
@@ -60024,14 +60062,18 @@ var ts;
                     assumeTrue = !assumeTrue;
                 }
                 var valueType = getTypeOfExpression(value);
-                if ((type.flags & 2) && assumeTrue && (operator === 36 || operator === 37)) {
+                if (((type.flags & 2) || isEmptyAnonymousObjectType(type) && !(valueType.flags & 98304)) &&
+                    assumeTrue &&
+                    (operator === 36 || operator === 37)) {
                     if (valueType.flags & (131068 | 67108864)) {
                         return valueType;
                     }
                     if (valueType.flags & 524288) {
                         return nonPrimitiveType;
                     }
-                    return type;
+                    if (type.flags & 2) {
+                        return type;
+                    }
                 }
                 if (valueType.flags & 98304) {
                     if (!strictNullChecks) {
@@ -60426,7 +60468,9 @@ var ts;
                 !!(type.flags & 465829888 && getBaseConstraintOrType(type).flags & (98304 | 1048576));
         }
         function isGenericTypeWithoutNullableConstraint(type) {
-            return !!(type.flags & 465829888 && !maybeTypeOfKind(getBaseConstraintOrType(type), 98304));
+            return type.flags & 2097152 ?
+                ts.some(type.types, isGenericTypeWithoutNullableConstraint) :
+                !!(type.flags & 465829888 && !maybeTypeOfKind(getBaseConstraintOrType(type), 98304));
         }
         function hasContextualTypeWithNoGenericTypes(node, checkMode) {
             var contextualType = (ts.isIdentifier(node) || ts.isPropertyAccessExpression(node) || ts.isElementAccessExpression(node)) &&
@@ -105437,9 +105481,7 @@ var ts;
                 }
             }
         }
-        var seenRefs = buildInfoPath ? new ts.Set() : undefined;
         var buildInfoCacheEntry = state.buildInfoCache.get(resolvedPath);
-        seenRefs === null || seenRefs === void 0 ? void 0 : seenRefs.add(resolvedPath);
         var pseudoUpToDate = false;
         var usesPrepend = false;
         var upstreamChangedProject;
@@ -105450,7 +105492,7 @@ var ts;
                 if (refStatus.newestInputFileTime && refStatus.newestInputFileTime <= oldestOutputFileTime) {
                     continue;
                 }
-                if (buildInfoCacheEntry && hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig, resolvedRefPath)) {
+                if (buildInfoCacheEntry && hasSameBuildInfo(state, buildInfoCacheEntry, resolvedRefPath)) {
                     return {
                         type: ts.UpToDateStatusType.OutOfDateWithUpstream,
                         outOfDateOutputFileName: buildInfoPath,
@@ -105501,24 +105543,9 @@ var ts;
             oldestOutputFileName: oldestOutputFileName
         };
     }
-    function hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig, resolvedRefPath) {
-        if (seenRefs.has(resolvedRefPath))
-            return false;
-        seenRefs.add(resolvedRefPath);
+    function hasSameBuildInfo(state, buildInfoCacheEntry, resolvedRefPath) {
         var refBuildInfo = state.buildInfoCache.get(resolvedRefPath);
-        if (refBuildInfo.path === buildInfoCacheEntry.path)
-            return true;
-        if (resolvedConfig.projectReferences) {
-            for (var _i = 0, _a = resolvedConfig.projectReferences; _i < _a.length; _i++) {
-                var ref = _a[_i];
-                var resolvedRef = ts.resolveProjectReferencePath(ref);
-                var resolvedRefPath_1 = toResolvedConfigFilePath(state, resolvedRef);
-                var resolvedConfig_1 = parseConfigFile(state, resolvedRef, resolvedRefPath_1);
-                if (hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig_1, resolvedRefPath_1))
-                    return true;
-            }
-        }
-        return false;
+        return refBuildInfo.path === buildInfoCacheEntry.path;
     }
     function getUpToDateStatus(state, project, resolvedPath) {
         if (project === undefined) {
diff --git a/lib/tsserver.js b/lib/tsserver.js
index 481cb5866634e..b696263504d68 100644
--- a/lib/tsserver.js
+++ b/lib/tsserver.js
@@ -109,7 +109,7 @@ var ts;
     // The following is baselined as a literal template type without intervention
     /** The version of the TypeScript compiler release */
     // eslint-disable-next-line @typescript-eslint/no-inferrable-types
-    ts.version = "4.8.2";
+    ts.version = "4.8.3";
     /* @internal */
     var Comparison;
     (function (Comparison) {
@@ -8875,7 +8875,7 @@ var ts;
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_node_Try_npm_i_save_dev_types_Slashnode_and_then_add_node_to_the_types_field_in_your_tsconfig: diag(2591, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_node_Try_npm_i_save_dev_types_Slashno_2591", "Cannot find name '{0}'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node` and then add 'node' to the types field in your tsconfig."),
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_jQuery_Try_npm_i_save_dev_types_Slashjquery_and_then_add_jquery_to_the_types_field_in_your_tsconfig: diag(2592, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_jQuery_Try_npm_i_save_dev_types_Slash_2592", "Cannot find name '{0}'. Do you need to install type definitions for jQuery? Try `npm i --save-dev @types/jquery` and then add 'jquery' to the types field in your tsconfig."),
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_a_test_runner_Try_npm_i_save_dev_types_Slashjest_or_npm_i_save_dev_types_Slashmocha_and_then_add_jest_or_mocha_to_the_types_field_in_your_tsconfig: diag(2593, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_a_test_runner_Try_npm_i_save_dev_type_2593", "Cannot find name '{0}'. Do you need to install type definitions for a test runner? Try `npm i --save-dev @types/jest` or `npm i --save-dev @types/mocha` and then add 'jest' or 'mocha' to the types field in your tsconfig."),
-        This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag: diag(2594, ts.DiagnosticCategory.Error, "This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the__2594", "This module is declared with using 'export =', and can only be used with a default import when using the '{0}' flag."),
+        This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag: diag(2594, ts.DiagnosticCategory.Error, "This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag_2594", "This module is declared with 'export =', and can only be used with a default import when using the '{0}' flag."),
         _0_can_only_be_imported_by_using_a_default_import: diag(2595, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_using_a_default_import_2595", "'{0}' can only be imported by using a default import."),
         _0_can_only_be_imported_by_turning_on_the_esModuleInterop_flag_and_using_a_default_import: diag(2596, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_turning_on_the_esModuleInterop_flag_and_using_a_default_import_2596", "'{0}' can only be imported by turning on the 'esModuleInterop' flag and using a default import."),
         _0_can_only_be_imported_by_using_a_require_call_or_by_using_a_default_import: diag(2597, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_using_a_require_call_or_by_using_a_default_import_2597", "'{0}' can only be imported by using a 'require' call or by using a default import."),
@@ -44636,7 +44636,7 @@ var ts;
                 var _a, _b;
                 if (path === undefined)
                     return path;
-                return ts.hostGetCanonicalFileName({ useCaseSensitiveFileNames: useCaseSensitiveFileNames })(ts.getNormalizedAbsolutePath(path, (_b = (_a = state.host).getCurrentDirectory) === null || _b === void 0 ? void 0 : _b.call(_a)));
+                return ts.getNormalizedAbsolutePath(path, (_b = (_a = state.host).getCurrentDirectory) === null || _b === void 0 ? void 0 : _b.call(_a));
             }
             function combineDirectoryPath(root, dir) {
                 return ts.ensureTrailingDirectorySeparator(ts.combinePaths(root, dir));
@@ -44656,7 +44656,7 @@ var ts;
                 if ((extensions === Extensions.TypeScript || extensions === Extensions.JavaScript || extensions === Extensions.Json)
                     && (state.compilerOptions.declarationDir || state.compilerOptions.outDir)
                     && finalPath.indexOf("/node_modules/") === -1
-                    && (state.compilerOptions.configFile ? ts.startsWith(toAbsolutePath(state.compilerOptions.configFile.fileName), scope.packageDirectory) : true)) {
+                    && (state.compilerOptions.configFile ? ts.containsPath(scope.packageDirectory, toAbsolutePath(state.compilerOptions.configFile.fileName), !useCaseSensitiveFileNames()) : true)) {
                     // So that all means we'll only try these guesses for files outside `node_modules` in a directory where the `package.json` and `tsconfig.json` are siblings.
                     // Even with all that, we still don't know if the root of the output file structure will be (relative to the package file)
                     // `.`, `./src` or any other deeper directory structure. (If project references are used, it's definitely `.` by fiat, so that should be pretty common.)
@@ -44712,7 +44712,7 @@ var ts;
                         var candidateDirectories = getOutputDirectoriesForBaseDirectory(commonSourceDirGuess);
                         for (var _e = 0, candidateDirectories_1 = candidateDirectories; _e < candidateDirectories_1.length; _e++) {
                             var candidateDir = candidateDirectories_1[_e];
-                            if (ts.startsWith(finalPath, candidateDir)) {
+                            if (ts.containsPath(candidateDir, finalPath, !useCaseSensitiveFileNames())) {
                                 // The matched export is looking up something in either the out declaration or js dir, now map the written path back into the source dir and source extension
                                 var pathFragment = finalPath.slice(candidateDir.length + 1); // +1 to also remove directory seperator
                                 var possibleInputBase = ts.combinePaths(commonSourceDirGuess, pathFragment);
@@ -50994,41 +50994,61 @@ var ts;
             return typeof file.externalModuleIndicator !== "object" && !resolveExportByName(moduleSymbol, ts.escapeLeadingUnderscores("__esModule"), /*sourceNode*/ undefined, dontResolveAlias);
         }
         function getTargetOfImportClause(node, dontResolveAlias) {
-            var _a;
             var moduleSymbol = resolveExternalModuleName(node, node.parent.moduleSpecifier);
             if (moduleSymbol) {
-                var exportDefaultSymbol = void 0;
-                if (ts.isShorthandAmbientModuleSymbol(moduleSymbol)) {
-                    exportDefaultSymbol = moduleSymbol;
-                }
-                else {
-                    exportDefaultSymbol = resolveExportByName(moduleSymbol, "default" /* InternalSymbolName.Default */, node, dontResolveAlias);
-                }
-                var file = (_a = moduleSymbol.declarations) === null || _a === void 0 ? void 0 : _a.find(ts.isSourceFile);
-                var hasDefaultOnly = isOnlyImportedAsDefault(node.parent.moduleSpecifier);
-                var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias, node.parent.moduleSpecifier);
-                if (!exportDefaultSymbol && !hasSyntheticDefault && !hasDefaultOnly) {
-                    if (hasExportAssignmentSymbol(moduleSymbol)) {
-                        var compilerOptionName = moduleKind >= ts.ModuleKind.ES2015 ? "allowSyntheticDefaultImports" : "esModuleInterop";
-                        var exportEqualsSymbol = moduleSymbol.exports.get("export=" /* InternalSymbolName.ExportEquals */);
-                        var exportAssignment = exportEqualsSymbol.valueDeclaration;
-                        var err = error(node.name, ts.Diagnostics.Module_0_can_only_be_default_imported_using_the_1_flag, symbolToString(moduleSymbol), compilerOptionName);
-                        if (exportAssignment) {
-                            ts.addRelatedInfo(err, ts.createDiagnosticForNode(exportAssignment, ts.Diagnostics.This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag, compilerOptionName));
-                        }
-                    }
-                    else {
-                        reportNonDefaultExport(moduleSymbol, node);
+                return getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias);
+            }
+        }
+        function getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias) {
+            var _a;
+            var exportDefaultSymbol;
+            if (ts.isShorthandAmbientModuleSymbol(moduleSymbol)) {
+                exportDefaultSymbol = moduleSymbol;
+            }
+            else {
+                exportDefaultSymbol = resolveExportByName(moduleSymbol, "default" /* InternalSymbolName.Default */, node, dontResolveAlias);
+            }
+            var file = (_a = moduleSymbol.declarations) === null || _a === void 0 ? void 0 : _a.find(ts.isSourceFile);
+            var specifier = getModuleSpecifierForImportOrExport(node);
+            if (!specifier) {
+                return exportDefaultSymbol;
+            }
+            var hasDefaultOnly = isOnlyImportedAsDefault(specifier);
+            var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias, specifier);
+            if (!exportDefaultSymbol && !hasSyntheticDefault && !hasDefaultOnly) {
+                if (hasExportAssignmentSymbol(moduleSymbol)) {
+                    var compilerOptionName = moduleKind >= ts.ModuleKind.ES2015 ? "allowSyntheticDefaultImports" : "esModuleInterop";
+                    var exportEqualsSymbol = moduleSymbol.exports.get("export=" /* InternalSymbolName.ExportEquals */);
+                    var exportAssignment = exportEqualsSymbol.valueDeclaration;
+                    var err = error(node.name, ts.Diagnostics.Module_0_can_only_be_default_imported_using_the_1_flag, symbolToString(moduleSymbol), compilerOptionName);
+                    if (exportAssignment) {
+                        ts.addRelatedInfo(err, ts.createDiagnosticForNode(exportAssignment, ts.Diagnostics.This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag, compilerOptionName));
                     }
                 }
-                else if (hasSyntheticDefault || hasDefaultOnly) {
-                    // per emit behavior, a synthetic default overrides a "real" .default member if `__esModule` is not present
-                    var resolved = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
-                    markSymbolOfAliasDeclarationIfTypeOnly(node, moduleSymbol, resolved, /*overwriteTypeOnly*/ false);
-                    return resolved;
+                else if (ts.isImportClause(node)) {
+                    reportNonDefaultExport(moduleSymbol, node);
                 }
-                markSymbolOfAliasDeclarationIfTypeOnly(node, exportDefaultSymbol, /*finalTarget*/ undefined, /*overwriteTypeOnly*/ false);
-                return exportDefaultSymbol;
+                else {
+                    errorNoModuleMemberSymbol(moduleSymbol, moduleSymbol, node, ts.isImportOrExportSpecifier(node) && node.propertyName || node.name);
+                }
+            }
+            else if (hasSyntheticDefault || hasDefaultOnly) {
+                // per emit behavior, a synthetic default overrides a "real" .default member if `__esModule` is not present
+                var resolved = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
+                markSymbolOfAliasDeclarationIfTypeOnly(node, moduleSymbol, resolved, /*overwriteTypeOnly*/ false);
+                return resolved;
+            }
+            markSymbolOfAliasDeclarationIfTypeOnly(node, exportDefaultSymbol, /*finalTarget*/ undefined, /*overwriteTypeOnly*/ false);
+            return exportDefaultSymbol;
+        }
+        function getModuleSpecifierForImportOrExport(node) {
+            switch (node.kind) {
+                case 267 /* SyntaxKind.ImportClause */: return node.parent.moduleSpecifier;
+                case 265 /* SyntaxKind.ImportEqualsDeclaration */: return ts.isExternalModuleReference(node.moduleReference) ? node.moduleReference.expression : undefined;
+                case 268 /* SyntaxKind.NamespaceImport */: return node.parent.parent.moduleSpecifier;
+                case 270 /* SyntaxKind.ImportSpecifier */: return node.parent.parent.parent.moduleSpecifier;
+                case 275 /* SyntaxKind.ExportSpecifier */: return node.parent.parent.moduleSpecifier;
+                default: return ts.Debug.assertNever(node);
             }
         }
         function reportNonDefaultExport(moduleSymbol, node) {
@@ -51118,7 +51138,7 @@ var ts;
             }
         }
         function getExternalModuleMember(node, specifier, dontResolveAlias) {
-            var _a, _b;
+            var _a;
             if (dontResolveAlias === void 0) { dontResolveAlias = false; }
             var moduleSpecifier = ts.getExternalModuleRequireArgument(node) || node.moduleSpecifier;
             var moduleSymbol = resolveExternalModuleName(node, moduleSpecifier); // TODO: GH#18217
@@ -51154,29 +51174,33 @@ var ts;
                         combineValueAndTypeSymbols(symbolFromVariable, symbolFromModule) :
                         symbolFromModule || symbolFromVariable;
                     if (!symbol) {
-                        var moduleName = getFullyQualifiedName(moduleSymbol, node);
-                        var declarationName = ts.declarationNameToString(name);
-                        var suggestion = getSuggestedSymbolForNonexistentModule(name, targetSymbol);
-                        if (suggestion !== undefined) {
-                            var suggestionName = symbolToString(suggestion);
-                            var diagnostic = error(name, ts.Diagnostics._0_has_no_exported_member_named_1_Did_you_mean_2, moduleName, declarationName, suggestionName);
-                            if (suggestion.valueDeclaration) {
-                                ts.addRelatedInfo(diagnostic, ts.createDiagnosticForNode(suggestion.valueDeclaration, ts.Diagnostics._0_is_declared_here, suggestionName));
-                            }
-                        }
-                        else {
-                            if ((_b = moduleSymbol.exports) === null || _b === void 0 ? void 0 : _b.has("default" /* InternalSymbolName.Default */)) {
-                                error(name, ts.Diagnostics.Module_0_has_no_exported_member_1_Did_you_mean_to_use_import_1_from_0_instead, moduleName, declarationName);
-                            }
-                            else {
-                                reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName);
-                            }
-                        }
+                        errorNoModuleMemberSymbol(moduleSymbol, targetSymbol, node, name);
                     }
                     return symbol;
                 }
             }
         }
+        function errorNoModuleMemberSymbol(moduleSymbol, targetSymbol, node, name) {
+            var _a;
+            var moduleName = getFullyQualifiedName(moduleSymbol, node);
+            var declarationName = ts.declarationNameToString(name);
+            var suggestion = getSuggestedSymbolForNonexistentModule(name, targetSymbol);
+            if (suggestion !== undefined) {
+                var suggestionName = symbolToString(suggestion);
+                var diagnostic = error(name, ts.Diagnostics._0_has_no_exported_member_named_1_Did_you_mean_2, moduleName, declarationName, suggestionName);
+                if (suggestion.valueDeclaration) {
+                    ts.addRelatedInfo(diagnostic, ts.createDiagnosticForNode(suggestion.valueDeclaration, ts.Diagnostics._0_is_declared_here, suggestionName));
+                }
+            }
+            else {
+                if ((_a = moduleSymbol.exports) === null || _a === void 0 ? void 0 : _a.has("default" /* InternalSymbolName.Default */)) {
+                    error(name, ts.Diagnostics.Module_0_has_no_exported_member_1_Did_you_mean_to_use_import_1_from_0_instead, moduleName, declarationName);
+                }
+                else {
+                    reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName);
+                }
+            }
+        }
         function reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName) {
             var _a, _b;
             var localSymbol = (_b = (_a = moduleSymbol.valueDeclaration) === null || _a === void 0 ? void 0 : _a.locals) === null || _b === void 0 ? void 0 : _b.get(name.escapedText);
@@ -51222,6 +51246,13 @@ var ts;
             }
         }
         function getTargetOfImportSpecifier(node, dontResolveAlias) {
+            if (ts.isImportSpecifier(node) && ts.idText(node.propertyName || node.name) === "default" /* InternalSymbolName.Default */) {
+                var specifier = getModuleSpecifierForImportOrExport(node);
+                var moduleSymbol = specifier && resolveExternalModuleName(node, specifier);
+                if (moduleSymbol) {
+                    return getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias);
+                }
+            }
             var root = ts.isBindingElement(node) ? ts.getRootDeclaration(node) : node.parent.parent.parent;
             var commonJSPropertyAccess = getCommonJSPropertyAccess(root);
             var resolved = getExternalModuleMember(root, commonJSPropertyAccess || node, dontResolveAlias);
@@ -51243,6 +51274,13 @@ var ts;
             return resolved;
         }
         function getTargetOfExportSpecifier(node, meaning, dontResolveAlias) {
+            if (ts.idText(node.propertyName || node.name) === "default" /* InternalSymbolName.Default */) {
+                var specifier = getModuleSpecifierForImportOrExport(node);
+                var moduleSymbol = specifier && resolveExternalModuleName(node, specifier);
+                if (moduleSymbol) {
+                    return getTargetofModuleDefault(moduleSymbol, node, !!dontResolveAlias);
+                }
+            }
             var resolved = node.parent.parent.moduleSpecifier ?
                 getExternalModuleMember(node.parent.parent, node, dontResolveAlias) :
                 resolveEntityName(node.propertyName || node.name, meaning, /*ignoreErrors*/ false, dontResolveAlias);
@@ -62193,7 +62231,7 @@ var ts;
                 return includes & 8388608 /* TypeFlags.IncludesWildcard */ ? wildcardType : anyType;
             }
             if (!strictNullChecks && includes & 98304 /* TypeFlags.Nullable */) {
-                return includes & 32768 /* TypeFlags.Undefined */ ? undefinedType : nullType;
+                return includes & 16777216 /* TypeFlags.IncludesEmptyObject */ ? neverType : includes & 32768 /* TypeFlags.Undefined */ ? undefinedType : nullType;
             }
             if (includes & 4 /* TypeFlags.String */ && includes & (128 /* TypeFlags.StringLiteral */ | 134217728 /* TypeFlags.TemplateLiteral */ | 268435456 /* TypeFlags.StringMapping */) ||
                 includes & 8 /* TypeFlags.Number */ && includes & 256 /* TypeFlags.NumberLiteral */ ||
@@ -62883,7 +62921,7 @@ var ts;
             // (T | U)[K] -> T[K] | U[K] (reading)
             // (T | U)[K] -> T[K] & U[K] (writing)
             // (T & U)[K] -> T[K] & U[K]
-            if (objectType.flags & 3145728 /* TypeFlags.UnionOrIntersection */) {
+            if (objectType.flags & 1048576 /* TypeFlags.Union */ || objectType.flags & 2097152 /* TypeFlags.Intersection */ && !shouldDeferIndexType(objectType)) {
                 var types = ts.map(objectType.types, function (t) { return getSimplifiedType(getIndexedAccessType(t, indexType), writing); });
                 return objectType.flags & 2097152 /* TypeFlags.Intersection */ || writing ? getIntersectionType(types) : getUnionType(types);
             }
@@ -65291,7 +65329,7 @@ var ts;
             if (reduced !== type) {
                 return reduced;
             }
-            if (type.flags & 2097152 /* TypeFlags.Intersection */) {
+            if (type.flags & 2097152 /* TypeFlags.Intersection */ && ts.some(type.types, isEmptyAnonymousObjectType)) {
                 var normalizedTypes = ts.sameMap(type.types, function (t) { return getNormalizedType(t, writing); });
                 if (normalizedTypes !== type.types) {
                     return getIntersectionType(normalizedTypes);
@@ -66462,7 +66500,7 @@ var ts;
                                     // create a new chain for the constraint error
                                     resetErrorInfo(saveErrorInfo);
                                 }
-                                if (result = isRelatedTo(source, constraint, 2 /* RecursionFlags.Target */, reportErrors)) {
+                                if (result = isRelatedTo(source, constraint, 2 /* RecursionFlags.Target */, reportErrors, /* headMessage */ undefined, intersectionState)) {
                                     return result;
                                 }
                                 // prefer the shorter chain of the constraint comparison chain, and the direct comparison chain
@@ -66554,8 +66592,8 @@ var ts;
                         var skipTrue = !isTypeAssignableTo(getPermissiveInstantiation(c.checkType), getPermissiveInstantiation(c.extendsType));
                         var skipFalse = !skipTrue && isTypeAssignableTo(getRestrictiveInstantiation(c.checkType), getRestrictiveInstantiation(c.extendsType));
                         // TODO: Find a nice way to include potential conditional type breakdowns in error output, if they seem good (they usually don't)
-                        if (result = skipTrue ? -1 /* Ternary.True */ : isRelatedTo(source, getTrueTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false)) {
-                            result &= skipFalse ? -1 /* Ternary.True */ : isRelatedTo(source, getFalseTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false);
+                        if (result = skipTrue ? -1 /* Ternary.True */ : isRelatedTo(source, getTrueTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false, /*headMessage*/ undefined, intersectionState)) {
+                            result &= skipFalse ? -1 /* Ternary.True */ : isRelatedTo(source, getFalseTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false, /*headMessage*/ undefined, intersectionState);
                             if (result) {
                                 return result;
                             }
@@ -71584,7 +71622,7 @@ var ts;
                 var narrowedPropType = narrowType(propType);
                 return filterType(type, function (t) {
                     var discriminantType = getTypeOfPropertyOrIndexSignature(t, propName);
-                    return !(narrowedPropType.flags & 131072 /* TypeFlags.Never */) && isTypeComparableTo(narrowedPropType, discriminantType);
+                    return !(narrowedPropType.flags & 131072 /* TypeFlags.Never */) && areTypesComparable(narrowedPropType, discriminantType);
                 });
             }
             function narrowTypeByDiscriminantProperty(type, access, operator, value, assumeTrue) {
@@ -71633,7 +71671,7 @@ var ts;
             }
             function narrowByInKeyword(type, name, assumeTrue) {
                 if (type.flags & 1048576 /* TypeFlags.Union */
-                    || type.flags & 524288 /* TypeFlags.Object */ && declaredType !== type
+                    || type.flags & 524288 /* TypeFlags.Object */ && declaredType !== type && !(declaredType === unknownType && isEmptyAnonymousObjectType(type))
                     || ts.isThisTypeParameter(type)
                     || type.flags & 2097152 /* TypeFlags.Intersection */ && ts.every(type.types, function (t) { return t.symbol !== globalThisSymbol; })) {
                     return filterType(type, function (t) { return isTypePresencePossible(t, name, assumeTrue); });
@@ -71766,14 +71804,18 @@ var ts;
                     assumeTrue = !assumeTrue;
                 }
                 var valueType = getTypeOfExpression(value);
-                if ((type.flags & 2 /* TypeFlags.Unknown */) && assumeTrue && (operator === 36 /* SyntaxKind.EqualsEqualsEqualsToken */ || operator === 37 /* SyntaxKind.ExclamationEqualsEqualsToken */)) {
+                if (((type.flags & 2 /* TypeFlags.Unknown */) || isEmptyAnonymousObjectType(type) && !(valueType.flags & 98304 /* TypeFlags.Nullable */)) &&
+                    assumeTrue &&
+                    (operator === 36 /* SyntaxKind.EqualsEqualsEqualsToken */ || operator === 37 /* SyntaxKind.ExclamationEqualsEqualsToken */)) {
                     if (valueType.flags & (131068 /* TypeFlags.Primitive */ | 67108864 /* TypeFlags.NonPrimitive */)) {
                         return valueType;
                     }
                     if (valueType.flags & 524288 /* TypeFlags.Object */) {
                         return nonPrimitiveType;
                     }
-                    return type;
+                    if (type.flags & 2 /* TypeFlags.Unknown */) {
+                        return type;
+                    }
                 }
                 if (valueType.flags & 98304 /* TypeFlags.Nullable */) {
                     if (!strictNullChecks) {
@@ -72232,7 +72274,9 @@ var ts;
                 !!(type.flags & 465829888 /* TypeFlags.Instantiable */ && getBaseConstraintOrType(type).flags & (98304 /* TypeFlags.Nullable */ | 1048576 /* TypeFlags.Union */));
         }
         function isGenericTypeWithoutNullableConstraint(type) {
-            return !!(type.flags & 465829888 /* TypeFlags.Instantiable */ && !maybeTypeOfKind(getBaseConstraintOrType(type), 98304 /* TypeFlags.Nullable */));
+            return type.flags & 2097152 /* TypeFlags.Intersection */ ?
+                ts.some(type.types, isGenericTypeWithoutNullableConstraint) :
+                !!(type.flags & 465829888 /* TypeFlags.Instantiable */ && !maybeTypeOfKind(getBaseConstraintOrType(type), 98304 /* TypeFlags.Nullable */));
         }
         function hasContextualTypeWithNoGenericTypes(node, checkMode) {
             // Computing the contextual type for a child of a JSX element involves resolving the type of the
@@ -126929,9 +126973,7 @@ var ts;
                 }
             }
         }
-        var seenRefs = buildInfoPath ? new ts.Set() : undefined;
         var buildInfoCacheEntry = state.buildInfoCache.get(resolvedPath);
-        seenRefs === null || seenRefs === void 0 ? void 0 : seenRefs.add(resolvedPath);
         /** Inputs are up-to-date, just need either timestamp update or bundle prepend manipulation to make it look up-to-date */
         var pseudoUpToDate = false;
         var usesPrepend = false;
@@ -126946,7 +126988,7 @@ var ts;
                     continue;
                 }
                 // Check if tsbuildinfo path is shared, then we need to rebuild
-                if (buildInfoCacheEntry && hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig, resolvedRefPath)) {
+                if (buildInfoCacheEntry && hasSameBuildInfo(state, buildInfoCacheEntry, resolvedRefPath)) {
                     return {
                         type: ts.UpToDateStatusType.OutOfDateWithUpstream,
                         outOfDateOutputFileName: buildInfoPath,
@@ -127004,25 +127046,9 @@ var ts;
             oldestOutputFileName: oldestOutputFileName
         };
     }
-    function hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig, resolvedRefPath) {
-        if (seenRefs.has(resolvedRefPath))
-            return false;
-        seenRefs.add(resolvedRefPath);
+    function hasSameBuildInfo(state, buildInfoCacheEntry, resolvedRefPath) {
         var refBuildInfo = state.buildInfoCache.get(resolvedRefPath);
-        if (refBuildInfo.path === buildInfoCacheEntry.path)
-            return true;
-        if (resolvedConfig.projectReferences) {
-            // Check references
-            for (var _i = 0, _a = resolvedConfig.projectReferences; _i < _a.length; _i++) {
-                var ref = _a[_i];
-                var resolvedRef = ts.resolveProjectReferencePath(ref);
-                var resolvedRefPath_1 = toResolvedConfigFilePath(state, resolvedRef);
-                var resolvedConfig_1 = parseConfigFile(state, resolvedRef, resolvedRefPath_1);
-                if (hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig_1, resolvedRefPath_1))
-                    return true;
-            }
-        }
-        return false;
+        return refBuildInfo.path === buildInfoCacheEntry.path;
     }
     function getUpToDateStatus(state, project, resolvedPath) {
         if (project === undefined) {
@@ -171614,13 +171640,13 @@ var ts;
                     return __generator(this, function (_a) {
                         switch (_a.label) {
                             case 0:
-                                ts.Debug.assertIsDefined(host.importServicePlugin);
+                                ts.Debug.assertIsDefined(host.importPlugin);
                                 resolvedPath = ts.combinePaths(initialDir, "node_modules");
                                 log("Dynamically importing ".concat(moduleName, " from ").concat(initialDir, " (resolved to ").concat(resolvedPath, ")"));
                                 _a.label = 1;
                             case 1:
                                 _a.trys.push([1, 3, , 4]);
-                                return [4 /*yield*/, host.importServicePlugin(resolvedPath, moduleName)];
+                                return [4 /*yield*/, host.importPlugin(resolvedPath, moduleName)];
                             case 2:
                                 result = _a.sent();
                                 return [3 /*break*/, 4];
@@ -172699,7 +172725,7 @@ var ts;
             };
             Project.prototype.enableGlobalPlugins = function (options, pluginConfigOverrides) {
                 var host = this.projectService.host;
-                if (!host.require && !host.importServicePlugin) {
+                if (!host.require && !host.importPlugin) {
                     this.projectService.logger.info("Plugins were requested but not running in environment that supports 'require'. Nothing will be loaded");
                     return;
                 }
@@ -172756,7 +172782,7 @@ var ts;
                     return __generator(this, function (_a) {
                         switch (_a.label) {
                             case 0:
-                                ts.Debug.assertIsDefined(this.projectService.host.importServicePlugin);
+                                ts.Debug.assertIsDefined(this.projectService.host.importPlugin);
                                 log = function (message) { return _this.projectService.logger.info(message); };
                                 logError = function (message) {
                                     (errorLogs !== null && errorLogs !== void 0 ? errorLogs : (errorLogs = [])).push(message);
@@ -173457,7 +173483,7 @@ var ts;
             /*@internal*/
             ConfiguredProject.prototype.enablePluginsWithOptions = function (options, pluginConfigOverrides) {
                 var host = this.projectService.host;
-                if (!host.require && !host.importServicePlugin) {
+                if (!host.require && !host.importPlugin) {
                     this.projectService.logger.info("Plugins were requested but not running in environment that supports 'require'. Nothing will be loaded");
                     return;
                 }
@@ -176901,7 +176927,7 @@ var ts;
             /*@internal*/
             ProjectService.prototype.requestEnablePlugin = function (project, pluginConfigEntry, searchPaths, pluginConfigOverrides) {
                 var _a;
-                if (!this.host.importServicePlugin && !this.host.require) {
+                if (!this.host.importPlugin && !this.host.require) {
                     this.logger.info("Plugins were requested but not running in environment that supports 'require'. Nothing will be loaded");
                     return;
                 }
@@ -176911,7 +176937,7 @@ var ts;
                     return;
                 }
                 // If the host supports dynamic import, begin enabling the plugin asynchronously.
-                if (this.host.importServicePlugin) {
+                if (this.host.importPlugin) {
                     var importPromise = project.beginEnablePluginAsync(pluginConfigEntry, searchPaths, pluginConfigOverrides);
                     (_a = this.pendingPluginEnablements) !== null && _a !== void 0 ? _a : (this.pendingPluginEnablements = new ts.Map());
                     var promises = this.pendingPluginEnablements.get(project);
@@ -181210,7 +181236,7 @@ var ts;
                 setImmediate: function (x) { return setTimeout(x, 0); },
                 clearImmediate: function (handle) { return clearTimeout(handle); },
                 /* eslint-enable no-restricted-globals */
-                importServicePlugin: function (initialDir, moduleName) { return __awaiter(_this, void 0, void 0, function () {
+                importPlugin: function (initialDir, moduleName) { return __awaiter(_this, void 0, void 0, function () {
                     var packageRoot, packageJson, packageJsonResponse, e_1, browser, scriptPath, module_1, e_2;
                     return __generator(this, function (_a) {
                         switch (_a.label) {
diff --git a/lib/tsserverlibrary.d.ts b/lib/tsserverlibrary.d.ts
index 4744d065a38ac..8003ac00a3c64 100644
--- a/lib/tsserverlibrary.d.ts
+++ b/lib/tsserverlibrary.d.ts
@@ -7033,7 +7033,6 @@ declare namespace ts.server {
         gc?(): void;
         trace?(s: string): void;
         require?(initialPath: string, moduleName: string): ModuleImportResult;
-        importServicePlugin?(root: string, moduleName: string): Promise<ModuleImportResult>;
     }
 }
 declare namespace ts.server {
diff --git a/lib/tsserverlibrary.js b/lib/tsserverlibrary.js
index 57276bce88f5a..53b8c929ba8f1 100644
--- a/lib/tsserverlibrary.js
+++ b/lib/tsserverlibrary.js
@@ -303,7 +303,7 @@ var ts;
     // The following is baselined as a literal template type without intervention
     /** The version of the TypeScript compiler release */
     // eslint-disable-next-line @typescript-eslint/no-inferrable-types
-    ts.version = "4.8.2";
+    ts.version = "4.8.3";
     /* @internal */
     var Comparison;
     (function (Comparison) {
@@ -9069,7 +9069,7 @@ var ts;
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_node_Try_npm_i_save_dev_types_Slashnode_and_then_add_node_to_the_types_field_in_your_tsconfig: diag(2591, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_node_Try_npm_i_save_dev_types_Slashno_2591", "Cannot find name '{0}'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node` and then add 'node' to the types field in your tsconfig."),
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_jQuery_Try_npm_i_save_dev_types_Slashjquery_and_then_add_jquery_to_the_types_field_in_your_tsconfig: diag(2592, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_jQuery_Try_npm_i_save_dev_types_Slash_2592", "Cannot find name '{0}'. Do you need to install type definitions for jQuery? Try `npm i --save-dev @types/jquery` and then add 'jquery' to the types field in your tsconfig."),
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_a_test_runner_Try_npm_i_save_dev_types_Slashjest_or_npm_i_save_dev_types_Slashmocha_and_then_add_jest_or_mocha_to_the_types_field_in_your_tsconfig: diag(2593, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_a_test_runner_Try_npm_i_save_dev_type_2593", "Cannot find name '{0}'. Do you need to install type definitions for a test runner? Try `npm i --save-dev @types/jest` or `npm i --save-dev @types/mocha` and then add 'jest' or 'mocha' to the types field in your tsconfig."),
-        This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag: diag(2594, ts.DiagnosticCategory.Error, "This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the__2594", "This module is declared with using 'export =', and can only be used with a default import when using the '{0}' flag."),
+        This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag: diag(2594, ts.DiagnosticCategory.Error, "This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag_2594", "This module is declared with 'export =', and can only be used with a default import when using the '{0}' flag."),
         _0_can_only_be_imported_by_using_a_default_import: diag(2595, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_using_a_default_import_2595", "'{0}' can only be imported by using a default import."),
         _0_can_only_be_imported_by_turning_on_the_esModuleInterop_flag_and_using_a_default_import: diag(2596, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_turning_on_the_esModuleInterop_flag_and_using_a_default_import_2596", "'{0}' can only be imported by turning on the 'esModuleInterop' flag and using a default import."),
         _0_can_only_be_imported_by_using_a_require_call_or_by_using_a_default_import: diag(2597, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_using_a_require_call_or_by_using_a_default_import_2597", "'{0}' can only be imported by using a 'require' call or by using a default import."),
@@ -44830,7 +44830,7 @@ var ts;
                 var _a, _b;
                 if (path === undefined)
                     return path;
-                return ts.hostGetCanonicalFileName({ useCaseSensitiveFileNames: useCaseSensitiveFileNames })(ts.getNormalizedAbsolutePath(path, (_b = (_a = state.host).getCurrentDirectory) === null || _b === void 0 ? void 0 : _b.call(_a)));
+                return ts.getNormalizedAbsolutePath(path, (_b = (_a = state.host).getCurrentDirectory) === null || _b === void 0 ? void 0 : _b.call(_a));
             }
             function combineDirectoryPath(root, dir) {
                 return ts.ensureTrailingDirectorySeparator(ts.combinePaths(root, dir));
@@ -44850,7 +44850,7 @@ var ts;
                 if ((extensions === Extensions.TypeScript || extensions === Extensions.JavaScript || extensions === Extensions.Json)
                     && (state.compilerOptions.declarationDir || state.compilerOptions.outDir)
                     && finalPath.indexOf("/node_modules/") === -1
-                    && (state.compilerOptions.configFile ? ts.startsWith(toAbsolutePath(state.compilerOptions.configFile.fileName), scope.packageDirectory) : true)) {
+                    && (state.compilerOptions.configFile ? ts.containsPath(scope.packageDirectory, toAbsolutePath(state.compilerOptions.configFile.fileName), !useCaseSensitiveFileNames()) : true)) {
                     // So that all means we'll only try these guesses for files outside `node_modules` in a directory where the `package.json` and `tsconfig.json` are siblings.
                     // Even with all that, we still don't know if the root of the output file structure will be (relative to the package file)
                     // `.`, `./src` or any other deeper directory structure. (If project references are used, it's definitely `.` by fiat, so that should be pretty common.)
@@ -44906,7 +44906,7 @@ var ts;
                         var candidateDirectories = getOutputDirectoriesForBaseDirectory(commonSourceDirGuess);
                         for (var _e = 0, candidateDirectories_1 = candidateDirectories; _e < candidateDirectories_1.length; _e++) {
                             var candidateDir = candidateDirectories_1[_e];
-                            if (ts.startsWith(finalPath, candidateDir)) {
+                            if (ts.containsPath(candidateDir, finalPath, !useCaseSensitiveFileNames())) {
                                 // The matched export is looking up something in either the out declaration or js dir, now map the written path back into the source dir and source extension
                                 var pathFragment = finalPath.slice(candidateDir.length + 1); // +1 to also remove directory seperator
                                 var possibleInputBase = ts.combinePaths(commonSourceDirGuess, pathFragment);
@@ -51188,41 +51188,61 @@ var ts;
             return typeof file.externalModuleIndicator !== "object" && !resolveExportByName(moduleSymbol, ts.escapeLeadingUnderscores("__esModule"), /*sourceNode*/ undefined, dontResolveAlias);
         }
         function getTargetOfImportClause(node, dontResolveAlias) {
-            var _a;
             var moduleSymbol = resolveExternalModuleName(node, node.parent.moduleSpecifier);
             if (moduleSymbol) {
-                var exportDefaultSymbol = void 0;
-                if (ts.isShorthandAmbientModuleSymbol(moduleSymbol)) {
-                    exportDefaultSymbol = moduleSymbol;
-                }
-                else {
-                    exportDefaultSymbol = resolveExportByName(moduleSymbol, "default" /* InternalSymbolName.Default */, node, dontResolveAlias);
-                }
-                var file = (_a = moduleSymbol.declarations) === null || _a === void 0 ? void 0 : _a.find(ts.isSourceFile);
-                var hasDefaultOnly = isOnlyImportedAsDefault(node.parent.moduleSpecifier);
-                var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias, node.parent.moduleSpecifier);
-                if (!exportDefaultSymbol && !hasSyntheticDefault && !hasDefaultOnly) {
-                    if (hasExportAssignmentSymbol(moduleSymbol)) {
-                        var compilerOptionName = moduleKind >= ts.ModuleKind.ES2015 ? "allowSyntheticDefaultImports" : "esModuleInterop";
-                        var exportEqualsSymbol = moduleSymbol.exports.get("export=" /* InternalSymbolName.ExportEquals */);
-                        var exportAssignment = exportEqualsSymbol.valueDeclaration;
-                        var err = error(node.name, ts.Diagnostics.Module_0_can_only_be_default_imported_using_the_1_flag, symbolToString(moduleSymbol), compilerOptionName);
-                        if (exportAssignment) {
-                            ts.addRelatedInfo(err, ts.createDiagnosticForNode(exportAssignment, ts.Diagnostics.This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag, compilerOptionName));
-                        }
-                    }
-                    else {
-                        reportNonDefaultExport(moduleSymbol, node);
+                return getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias);
+            }
+        }
+        function getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias) {
+            var _a;
+            var exportDefaultSymbol;
+            if (ts.isShorthandAmbientModuleSymbol(moduleSymbol)) {
+                exportDefaultSymbol = moduleSymbol;
+            }
+            else {
+                exportDefaultSymbol = resolveExportByName(moduleSymbol, "default" /* InternalSymbolName.Default */, node, dontResolveAlias);
+            }
+            var file = (_a = moduleSymbol.declarations) === null || _a === void 0 ? void 0 : _a.find(ts.isSourceFile);
+            var specifier = getModuleSpecifierForImportOrExport(node);
+            if (!specifier) {
+                return exportDefaultSymbol;
+            }
+            var hasDefaultOnly = isOnlyImportedAsDefault(specifier);
+            var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias, specifier);
+            if (!exportDefaultSymbol && !hasSyntheticDefault && !hasDefaultOnly) {
+                if (hasExportAssignmentSymbol(moduleSymbol)) {
+                    var compilerOptionName = moduleKind >= ts.ModuleKind.ES2015 ? "allowSyntheticDefaultImports" : "esModuleInterop";
+                    var exportEqualsSymbol = moduleSymbol.exports.get("export=" /* InternalSymbolName.ExportEquals */);
+                    var exportAssignment = exportEqualsSymbol.valueDeclaration;
+                    var err = error(node.name, ts.Diagnostics.Module_0_can_only_be_default_imported_using_the_1_flag, symbolToString(moduleSymbol), compilerOptionName);
+                    if (exportAssignment) {
+                        ts.addRelatedInfo(err, ts.createDiagnosticForNode(exportAssignment, ts.Diagnostics.This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag, compilerOptionName));
                     }
                 }
-                else if (hasSyntheticDefault || hasDefaultOnly) {
-                    // per emit behavior, a synthetic default overrides a "real" .default member if `__esModule` is not present
-                    var resolved = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
-                    markSymbolOfAliasDeclarationIfTypeOnly(node, moduleSymbol, resolved, /*overwriteTypeOnly*/ false);
-                    return resolved;
+                else if (ts.isImportClause(node)) {
+                    reportNonDefaultExport(moduleSymbol, node);
                 }
-                markSymbolOfAliasDeclarationIfTypeOnly(node, exportDefaultSymbol, /*finalTarget*/ undefined, /*overwriteTypeOnly*/ false);
-                return exportDefaultSymbol;
+                else {
+                    errorNoModuleMemberSymbol(moduleSymbol, moduleSymbol, node, ts.isImportOrExportSpecifier(node) && node.propertyName || node.name);
+                }
+            }
+            else if (hasSyntheticDefault || hasDefaultOnly) {
+                // per emit behavior, a synthetic default overrides a "real" .default member if `__esModule` is not present
+                var resolved = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
+                markSymbolOfAliasDeclarationIfTypeOnly(node, moduleSymbol, resolved, /*overwriteTypeOnly*/ false);
+                return resolved;
+            }
+            markSymbolOfAliasDeclarationIfTypeOnly(node, exportDefaultSymbol, /*finalTarget*/ undefined, /*overwriteTypeOnly*/ false);
+            return exportDefaultSymbol;
+        }
+        function getModuleSpecifierForImportOrExport(node) {
+            switch (node.kind) {
+                case 267 /* SyntaxKind.ImportClause */: return node.parent.moduleSpecifier;
+                case 265 /* SyntaxKind.ImportEqualsDeclaration */: return ts.isExternalModuleReference(node.moduleReference) ? node.moduleReference.expression : undefined;
+                case 268 /* SyntaxKind.NamespaceImport */: return node.parent.parent.moduleSpecifier;
+                case 270 /* SyntaxKind.ImportSpecifier */: return node.parent.parent.parent.moduleSpecifier;
+                case 275 /* SyntaxKind.ExportSpecifier */: return node.parent.parent.moduleSpecifier;
+                default: return ts.Debug.assertNever(node);
             }
         }
         function reportNonDefaultExport(moduleSymbol, node) {
@@ -51312,7 +51332,7 @@ var ts;
             }
         }
         function getExternalModuleMember(node, specifier, dontResolveAlias) {
-            var _a, _b;
+            var _a;
             if (dontResolveAlias === void 0) { dontResolveAlias = false; }
             var moduleSpecifier = ts.getExternalModuleRequireArgument(node) || node.moduleSpecifier;
             var moduleSymbol = resolveExternalModuleName(node, moduleSpecifier); // TODO: GH#18217
@@ -51348,29 +51368,33 @@ var ts;
                         combineValueAndTypeSymbols(symbolFromVariable, symbolFromModule) :
                         symbolFromModule || symbolFromVariable;
                     if (!symbol) {
-                        var moduleName = getFullyQualifiedName(moduleSymbol, node);
-                        var declarationName = ts.declarationNameToString(name);
-                        var suggestion = getSuggestedSymbolForNonexistentModule(name, targetSymbol);
-                        if (suggestion !== undefined) {
-                            var suggestionName = symbolToString(suggestion);
-                            var diagnostic = error(name, ts.Diagnostics._0_has_no_exported_member_named_1_Did_you_mean_2, moduleName, declarationName, suggestionName);
-                            if (suggestion.valueDeclaration) {
-                                ts.addRelatedInfo(diagnostic, ts.createDiagnosticForNode(suggestion.valueDeclaration, ts.Diagnostics._0_is_declared_here, suggestionName));
-                            }
-                        }
-                        else {
-                            if ((_b = moduleSymbol.exports) === null || _b === void 0 ? void 0 : _b.has("default" /* InternalSymbolName.Default */)) {
-                                error(name, ts.Diagnostics.Module_0_has_no_exported_member_1_Did_you_mean_to_use_import_1_from_0_instead, moduleName, declarationName);
-                            }
-                            else {
-                                reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName);
-                            }
-                        }
+                        errorNoModuleMemberSymbol(moduleSymbol, targetSymbol, node, name);
                     }
                     return symbol;
                 }
             }
         }
+        function errorNoModuleMemberSymbol(moduleSymbol, targetSymbol, node, name) {
+            var _a;
+            var moduleName = getFullyQualifiedName(moduleSymbol, node);
+            var declarationName = ts.declarationNameToString(name);
+            var suggestion = getSuggestedSymbolForNonexistentModule(name, targetSymbol);
+            if (suggestion !== undefined) {
+                var suggestionName = symbolToString(suggestion);
+                var diagnostic = error(name, ts.Diagnostics._0_has_no_exported_member_named_1_Did_you_mean_2, moduleName, declarationName, suggestionName);
+                if (suggestion.valueDeclaration) {
+                    ts.addRelatedInfo(diagnostic, ts.createDiagnosticForNode(suggestion.valueDeclaration, ts.Diagnostics._0_is_declared_here, suggestionName));
+                }
+            }
+            else {
+                if ((_a = moduleSymbol.exports) === null || _a === void 0 ? void 0 : _a.has("default" /* InternalSymbolName.Default */)) {
+                    error(name, ts.Diagnostics.Module_0_has_no_exported_member_1_Did_you_mean_to_use_import_1_from_0_instead, moduleName, declarationName);
+                }
+                else {
+                    reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName);
+                }
+            }
+        }
         function reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName) {
             var _a, _b;
             var localSymbol = (_b = (_a = moduleSymbol.valueDeclaration) === null || _a === void 0 ? void 0 : _a.locals) === null || _b === void 0 ? void 0 : _b.get(name.escapedText);
@@ -51416,6 +51440,13 @@ var ts;
             }
         }
         function getTargetOfImportSpecifier(node, dontResolveAlias) {
+            if (ts.isImportSpecifier(node) && ts.idText(node.propertyName || node.name) === "default" /* InternalSymbolName.Default */) {
+                var specifier = getModuleSpecifierForImportOrExport(node);
+                var moduleSymbol = specifier && resolveExternalModuleName(node, specifier);
+                if (moduleSymbol) {
+                    return getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias);
+                }
+            }
             var root = ts.isBindingElement(node) ? ts.getRootDeclaration(node) : node.parent.parent.parent;
             var commonJSPropertyAccess = getCommonJSPropertyAccess(root);
             var resolved = getExternalModuleMember(root, commonJSPropertyAccess || node, dontResolveAlias);
@@ -51437,6 +51468,13 @@ var ts;
             return resolved;
         }
         function getTargetOfExportSpecifier(node, meaning, dontResolveAlias) {
+            if (ts.idText(node.propertyName || node.name) === "default" /* InternalSymbolName.Default */) {
+                var specifier = getModuleSpecifierForImportOrExport(node);
+                var moduleSymbol = specifier && resolveExternalModuleName(node, specifier);
+                if (moduleSymbol) {
+                    return getTargetofModuleDefault(moduleSymbol, node, !!dontResolveAlias);
+                }
+            }
             var resolved = node.parent.parent.moduleSpecifier ?
                 getExternalModuleMember(node.parent.parent, node, dontResolveAlias) :
                 resolveEntityName(node.propertyName || node.name, meaning, /*ignoreErrors*/ false, dontResolveAlias);
@@ -62387,7 +62425,7 @@ var ts;
                 return includes & 8388608 /* TypeFlags.IncludesWildcard */ ? wildcardType : anyType;
             }
             if (!strictNullChecks && includes & 98304 /* TypeFlags.Nullable */) {
-                return includes & 32768 /* TypeFlags.Undefined */ ? undefinedType : nullType;
+                return includes & 16777216 /* TypeFlags.IncludesEmptyObject */ ? neverType : includes & 32768 /* TypeFlags.Undefined */ ? undefinedType : nullType;
             }
             if (includes & 4 /* TypeFlags.String */ && includes & (128 /* TypeFlags.StringLiteral */ | 134217728 /* TypeFlags.TemplateLiteral */ | 268435456 /* TypeFlags.StringMapping */) ||
                 includes & 8 /* TypeFlags.Number */ && includes & 256 /* TypeFlags.NumberLiteral */ ||
@@ -63077,7 +63115,7 @@ var ts;
             // (T | U)[K] -> T[K] | U[K] (reading)
             // (T | U)[K] -> T[K] & U[K] (writing)
             // (T & U)[K] -> T[K] & U[K]
-            if (objectType.flags & 3145728 /* TypeFlags.UnionOrIntersection */) {
+            if (objectType.flags & 1048576 /* TypeFlags.Union */ || objectType.flags & 2097152 /* TypeFlags.Intersection */ && !shouldDeferIndexType(objectType)) {
                 var types = ts.map(objectType.types, function (t) { return getSimplifiedType(getIndexedAccessType(t, indexType), writing); });
                 return objectType.flags & 2097152 /* TypeFlags.Intersection */ || writing ? getIntersectionType(types) : getUnionType(types);
             }
@@ -65485,7 +65523,7 @@ var ts;
             if (reduced !== type) {
                 return reduced;
             }
-            if (type.flags & 2097152 /* TypeFlags.Intersection */) {
+            if (type.flags & 2097152 /* TypeFlags.Intersection */ && ts.some(type.types, isEmptyAnonymousObjectType)) {
                 var normalizedTypes = ts.sameMap(type.types, function (t) { return getNormalizedType(t, writing); });
                 if (normalizedTypes !== type.types) {
                     return getIntersectionType(normalizedTypes);
@@ -66656,7 +66694,7 @@ var ts;
                                     // create a new chain for the constraint error
                                     resetErrorInfo(saveErrorInfo);
                                 }
-                                if (result = isRelatedTo(source, constraint, 2 /* RecursionFlags.Target */, reportErrors)) {
+                                if (result = isRelatedTo(source, constraint, 2 /* RecursionFlags.Target */, reportErrors, /* headMessage */ undefined, intersectionState)) {
                                     return result;
                                 }
                                 // prefer the shorter chain of the constraint comparison chain, and the direct comparison chain
@@ -66748,8 +66786,8 @@ var ts;
                         var skipTrue = !isTypeAssignableTo(getPermissiveInstantiation(c.checkType), getPermissiveInstantiation(c.extendsType));
                         var skipFalse = !skipTrue && isTypeAssignableTo(getRestrictiveInstantiation(c.checkType), getRestrictiveInstantiation(c.extendsType));
                         // TODO: Find a nice way to include potential conditional type breakdowns in error output, if they seem good (they usually don't)
-                        if (result = skipTrue ? -1 /* Ternary.True */ : isRelatedTo(source, getTrueTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false)) {
-                            result &= skipFalse ? -1 /* Ternary.True */ : isRelatedTo(source, getFalseTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false);
+                        if (result = skipTrue ? -1 /* Ternary.True */ : isRelatedTo(source, getTrueTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false, /*headMessage*/ undefined, intersectionState)) {
+                            result &= skipFalse ? -1 /* Ternary.True */ : isRelatedTo(source, getFalseTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false, /*headMessage*/ undefined, intersectionState);
                             if (result) {
                                 return result;
                             }
@@ -71778,7 +71816,7 @@ var ts;
                 var narrowedPropType = narrowType(propType);
                 return filterType(type, function (t) {
                     var discriminantType = getTypeOfPropertyOrIndexSignature(t, propName);
-                    return !(narrowedPropType.flags & 131072 /* TypeFlags.Never */) && isTypeComparableTo(narrowedPropType, discriminantType);
+                    return !(narrowedPropType.flags & 131072 /* TypeFlags.Never */) && areTypesComparable(narrowedPropType, discriminantType);
                 });
             }
             function narrowTypeByDiscriminantProperty(type, access, operator, value, assumeTrue) {
@@ -71827,7 +71865,7 @@ var ts;
             }
             function narrowByInKeyword(type, name, assumeTrue) {
                 if (type.flags & 1048576 /* TypeFlags.Union */
-                    || type.flags & 524288 /* TypeFlags.Object */ && declaredType !== type
+                    || type.flags & 524288 /* TypeFlags.Object */ && declaredType !== type && !(declaredType === unknownType && isEmptyAnonymousObjectType(type))
                     || ts.isThisTypeParameter(type)
                     || type.flags & 2097152 /* TypeFlags.Intersection */ && ts.every(type.types, function (t) { return t.symbol !== globalThisSymbol; })) {
                     return filterType(type, function (t) { return isTypePresencePossible(t, name, assumeTrue); });
@@ -71960,14 +71998,18 @@ var ts;
                     assumeTrue = !assumeTrue;
                 }
                 var valueType = getTypeOfExpression(value);
-                if ((type.flags & 2 /* TypeFlags.Unknown */) && assumeTrue && (operator === 36 /* SyntaxKind.EqualsEqualsEqualsToken */ || operator === 37 /* SyntaxKind.ExclamationEqualsEqualsToken */)) {
+                if (((type.flags & 2 /* TypeFlags.Unknown */) || isEmptyAnonymousObjectType(type) && !(valueType.flags & 98304 /* TypeFlags.Nullable */)) &&
+                    assumeTrue &&
+                    (operator === 36 /* SyntaxKind.EqualsEqualsEqualsToken */ || operator === 37 /* SyntaxKind.ExclamationEqualsEqualsToken */)) {
                     if (valueType.flags & (131068 /* TypeFlags.Primitive */ | 67108864 /* TypeFlags.NonPrimitive */)) {
                         return valueType;
                     }
                     if (valueType.flags & 524288 /* TypeFlags.Object */) {
                         return nonPrimitiveType;
                     }
-                    return type;
+                    if (type.flags & 2 /* TypeFlags.Unknown */) {
+                        return type;
+                    }
                 }
                 if (valueType.flags & 98304 /* TypeFlags.Nullable */) {
                     if (!strictNullChecks) {
@@ -72426,7 +72468,9 @@ var ts;
                 !!(type.flags & 465829888 /* TypeFlags.Instantiable */ && getBaseConstraintOrType(type).flags & (98304 /* TypeFlags.Nullable */ | 1048576 /* TypeFlags.Union */));
         }
         function isGenericTypeWithoutNullableConstraint(type) {
-            return !!(type.flags & 465829888 /* TypeFlags.Instantiable */ && !maybeTypeOfKind(getBaseConstraintOrType(type), 98304 /* TypeFlags.Nullable */));
+            return type.flags & 2097152 /* TypeFlags.Intersection */ ?
+                ts.some(type.types, isGenericTypeWithoutNullableConstraint) :
+                !!(type.flags & 465829888 /* TypeFlags.Instantiable */ && !maybeTypeOfKind(getBaseConstraintOrType(type), 98304 /* TypeFlags.Nullable */));
         }
         function hasContextualTypeWithNoGenericTypes(node, checkMode) {
             // Computing the contextual type for a child of a JSX element involves resolving the type of the
@@ -127123,9 +127167,7 @@ var ts;
                 }
             }
         }
-        var seenRefs = buildInfoPath ? new ts.Set() : undefined;
         var buildInfoCacheEntry = state.buildInfoCache.get(resolvedPath);
-        seenRefs === null || seenRefs === void 0 ? void 0 : seenRefs.add(resolvedPath);
         /** Inputs are up-to-date, just need either timestamp update or bundle prepend manipulation to make it look up-to-date */
         var pseudoUpToDate = false;
         var usesPrepend = false;
@@ -127140,7 +127182,7 @@ var ts;
                     continue;
                 }
                 // Check if tsbuildinfo path is shared, then we need to rebuild
-                if (buildInfoCacheEntry && hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig, resolvedRefPath)) {
+                if (buildInfoCacheEntry && hasSameBuildInfo(state, buildInfoCacheEntry, resolvedRefPath)) {
                     return {
                         type: ts.UpToDateStatusType.OutOfDateWithUpstream,
                         outOfDateOutputFileName: buildInfoPath,
@@ -127198,25 +127240,9 @@ var ts;
             oldestOutputFileName: oldestOutputFileName
         };
     }
-    function hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig, resolvedRefPath) {
-        if (seenRefs.has(resolvedRefPath))
-            return false;
-        seenRefs.add(resolvedRefPath);
+    function hasSameBuildInfo(state, buildInfoCacheEntry, resolvedRefPath) {
         var refBuildInfo = state.buildInfoCache.get(resolvedRefPath);
-        if (refBuildInfo.path === buildInfoCacheEntry.path)
-            return true;
-        if (resolvedConfig.projectReferences) {
-            // Check references
-            for (var _i = 0, _a = resolvedConfig.projectReferences; _i < _a.length; _i++) {
-                var ref = _a[_i];
-                var resolvedRef = ts.resolveProjectReferencePath(ref);
-                var resolvedRefPath_1 = toResolvedConfigFilePath(state, resolvedRef);
-                var resolvedConfig_1 = parseConfigFile(state, resolvedRef, resolvedRefPath_1);
-                if (hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig_1, resolvedRefPath_1))
-                    return true;
-            }
-        }
-        return false;
+        return refBuildInfo.path === buildInfoCacheEntry.path;
     }
     function getUpToDateStatus(state, project, resolvedPath) {
         if (project === undefined) {
@@ -171808,13 +171834,13 @@ var ts;
                     return __generator(this, function (_a) {
                         switch (_a.label) {
                             case 0:
-                                ts.Debug.assertIsDefined(host.importServicePlugin);
+                                ts.Debug.assertIsDefined(host.importPlugin);
                                 resolvedPath = ts.combinePaths(initialDir, "node_modules");
                                 log("Dynamically importing ".concat(moduleName, " from ").concat(initialDir, " (resolved to ").concat(resolvedPath, ")"));
                                 _a.label = 1;
                             case 1:
                                 _a.trys.push([1, 3, , 4]);
-                                return [4 /*yield*/, host.importServicePlugin(resolvedPath, moduleName)];
+                                return [4 /*yield*/, host.importPlugin(resolvedPath, moduleName)];
                             case 2:
                                 result = _a.sent();
                                 return [3 /*break*/, 4];
@@ -172893,7 +172919,7 @@ var ts;
             };
             Project.prototype.enableGlobalPlugins = function (options, pluginConfigOverrides) {
                 var host = this.projectService.host;
-                if (!host.require && !host.importServicePlugin) {
+                if (!host.require && !host.importPlugin) {
                     this.projectService.logger.info("Plugins were requested but not running in environment that supports 'require'. Nothing will be loaded");
                     return;
                 }
@@ -172950,7 +172976,7 @@ var ts;
                     return __generator(this, function (_a) {
                         switch (_a.label) {
                             case 0:
-                                ts.Debug.assertIsDefined(this.projectService.host.importServicePlugin);
+                                ts.Debug.assertIsDefined(this.projectService.host.importPlugin);
                                 log = function (message) { return _this.projectService.logger.info(message); };
                                 logError = function (message) {
                                     (errorLogs !== null && errorLogs !== void 0 ? errorLogs : (errorLogs = [])).push(message);
@@ -173651,7 +173677,7 @@ var ts;
             /*@internal*/
             ConfiguredProject.prototype.enablePluginsWithOptions = function (options, pluginConfigOverrides) {
                 var host = this.projectService.host;
-                if (!host.require && !host.importServicePlugin) {
+                if (!host.require && !host.importPlugin) {
                     this.projectService.logger.info("Plugins were requested but not running in environment that supports 'require'. Nothing will be loaded");
                     return;
                 }
@@ -177095,7 +177121,7 @@ var ts;
             /*@internal*/
             ProjectService.prototype.requestEnablePlugin = function (project, pluginConfigEntry, searchPaths, pluginConfigOverrides) {
                 var _a;
-                if (!this.host.importServicePlugin && !this.host.require) {
+                if (!this.host.importPlugin && !this.host.require) {
                     this.logger.info("Plugins were requested but not running in environment that supports 'require'. Nothing will be loaded");
                     return;
                 }
@@ -177105,7 +177131,7 @@ var ts;
                     return;
                 }
                 // If the host supports dynamic import, begin enabling the plugin asynchronously.
-                if (this.host.importServicePlugin) {
+                if (this.host.importPlugin) {
                     var importPromise = project.beginEnablePluginAsync(pluginConfigEntry, searchPaths, pluginConfigOverrides);
                     (_a = this.pendingPluginEnablements) !== null && _a !== void 0 ? _a : (this.pendingPluginEnablements = new ts.Map());
                     var promises = this.pendingPluginEnablements.get(project);
diff --git a/lib/typescript.js b/lib/typescript.js
index 49899ec44b380..3c93c04e0e47a 100644
--- a/lib/typescript.js
+++ b/lib/typescript.js
@@ -294,7 +294,7 @@ var ts;
     // The following is baselined as a literal template type without intervention
     /** The version of the TypeScript compiler release */
     // eslint-disable-next-line @typescript-eslint/no-inferrable-types
-    ts.version = "4.8.2";
+    ts.version = "4.8.3";
     /* @internal */
     var Comparison;
     (function (Comparison) {
@@ -9060,7 +9060,7 @@ var ts;
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_node_Try_npm_i_save_dev_types_Slashnode_and_then_add_node_to_the_types_field_in_your_tsconfig: diag(2591, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_node_Try_npm_i_save_dev_types_Slashno_2591", "Cannot find name '{0}'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node` and then add 'node' to the types field in your tsconfig."),
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_jQuery_Try_npm_i_save_dev_types_Slashjquery_and_then_add_jquery_to_the_types_field_in_your_tsconfig: diag(2592, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_jQuery_Try_npm_i_save_dev_types_Slash_2592", "Cannot find name '{0}'. Do you need to install type definitions for jQuery? Try `npm i --save-dev @types/jquery` and then add 'jquery' to the types field in your tsconfig."),
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_a_test_runner_Try_npm_i_save_dev_types_Slashjest_or_npm_i_save_dev_types_Slashmocha_and_then_add_jest_or_mocha_to_the_types_field_in_your_tsconfig: diag(2593, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_a_test_runner_Try_npm_i_save_dev_type_2593", "Cannot find name '{0}'. Do you need to install type definitions for a test runner? Try `npm i --save-dev @types/jest` or `npm i --save-dev @types/mocha` and then add 'jest' or 'mocha' to the types field in your tsconfig."),
-        This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag: diag(2594, ts.DiagnosticCategory.Error, "This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the__2594", "This module is declared with using 'export =', and can only be used with a default import when using the '{0}' flag."),
+        This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag: diag(2594, ts.DiagnosticCategory.Error, "This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag_2594", "This module is declared with 'export =', and can only be used with a default import when using the '{0}' flag."),
         _0_can_only_be_imported_by_using_a_default_import: diag(2595, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_using_a_default_import_2595", "'{0}' can only be imported by using a default import."),
         _0_can_only_be_imported_by_turning_on_the_esModuleInterop_flag_and_using_a_default_import: diag(2596, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_turning_on_the_esModuleInterop_flag_and_using_a_default_import_2596", "'{0}' can only be imported by turning on the 'esModuleInterop' flag and using a default import."),
         _0_can_only_be_imported_by_using_a_require_call_or_by_using_a_default_import: diag(2597, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_using_a_require_call_or_by_using_a_default_import_2597", "'{0}' can only be imported by using a 'require' call or by using a default import."),
@@ -44821,7 +44821,7 @@ var ts;
                 var _a, _b;
                 if (path === undefined)
                     return path;
-                return ts.hostGetCanonicalFileName({ useCaseSensitiveFileNames: useCaseSensitiveFileNames })(ts.getNormalizedAbsolutePath(path, (_b = (_a = state.host).getCurrentDirectory) === null || _b === void 0 ? void 0 : _b.call(_a)));
+                return ts.getNormalizedAbsolutePath(path, (_b = (_a = state.host).getCurrentDirectory) === null || _b === void 0 ? void 0 : _b.call(_a));
             }
             function combineDirectoryPath(root, dir) {
                 return ts.ensureTrailingDirectorySeparator(ts.combinePaths(root, dir));
@@ -44841,7 +44841,7 @@ var ts;
                 if ((extensions === Extensions.TypeScript || extensions === Extensions.JavaScript || extensions === Extensions.Json)
                     && (state.compilerOptions.declarationDir || state.compilerOptions.outDir)
                     && finalPath.indexOf("/node_modules/") === -1
-                    && (state.compilerOptions.configFile ? ts.startsWith(toAbsolutePath(state.compilerOptions.configFile.fileName), scope.packageDirectory) : true)) {
+                    && (state.compilerOptions.configFile ? ts.containsPath(scope.packageDirectory, toAbsolutePath(state.compilerOptions.configFile.fileName), !useCaseSensitiveFileNames()) : true)) {
                     // So that all means we'll only try these guesses for files outside `node_modules` in a directory where the `package.json` and `tsconfig.json` are siblings.
                     // Even with all that, we still don't know if the root of the output file structure will be (relative to the package file)
                     // `.`, `./src` or any other deeper directory structure. (If project references are used, it's definitely `.` by fiat, so that should be pretty common.)
@@ -44897,7 +44897,7 @@ var ts;
                         var candidateDirectories = getOutputDirectoriesForBaseDirectory(commonSourceDirGuess);
                         for (var _e = 0, candidateDirectories_1 = candidateDirectories; _e < candidateDirectories_1.length; _e++) {
                             var candidateDir = candidateDirectories_1[_e];
-                            if (ts.startsWith(finalPath, candidateDir)) {
+                            if (ts.containsPath(candidateDir, finalPath, !useCaseSensitiveFileNames())) {
                                 // The matched export is looking up something in either the out declaration or js dir, now map the written path back into the source dir and source extension
                                 var pathFragment = finalPath.slice(candidateDir.length + 1); // +1 to also remove directory seperator
                                 var possibleInputBase = ts.combinePaths(commonSourceDirGuess, pathFragment);
@@ -51179,41 +51179,61 @@ var ts;
             return typeof file.externalModuleIndicator !== "object" && !resolveExportByName(moduleSymbol, ts.escapeLeadingUnderscores("__esModule"), /*sourceNode*/ undefined, dontResolveAlias);
         }
         function getTargetOfImportClause(node, dontResolveAlias) {
-            var _a;
             var moduleSymbol = resolveExternalModuleName(node, node.parent.moduleSpecifier);
             if (moduleSymbol) {
-                var exportDefaultSymbol = void 0;
-                if (ts.isShorthandAmbientModuleSymbol(moduleSymbol)) {
-                    exportDefaultSymbol = moduleSymbol;
-                }
-                else {
-                    exportDefaultSymbol = resolveExportByName(moduleSymbol, "default" /* InternalSymbolName.Default */, node, dontResolveAlias);
-                }
-                var file = (_a = moduleSymbol.declarations) === null || _a === void 0 ? void 0 : _a.find(ts.isSourceFile);
-                var hasDefaultOnly = isOnlyImportedAsDefault(node.parent.moduleSpecifier);
-                var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias, node.parent.moduleSpecifier);
-                if (!exportDefaultSymbol && !hasSyntheticDefault && !hasDefaultOnly) {
-                    if (hasExportAssignmentSymbol(moduleSymbol)) {
-                        var compilerOptionName = moduleKind >= ts.ModuleKind.ES2015 ? "allowSyntheticDefaultImports" : "esModuleInterop";
-                        var exportEqualsSymbol = moduleSymbol.exports.get("export=" /* InternalSymbolName.ExportEquals */);
-                        var exportAssignment = exportEqualsSymbol.valueDeclaration;
-                        var err = error(node.name, ts.Diagnostics.Module_0_can_only_be_default_imported_using_the_1_flag, symbolToString(moduleSymbol), compilerOptionName);
-                        if (exportAssignment) {
-                            ts.addRelatedInfo(err, ts.createDiagnosticForNode(exportAssignment, ts.Diagnostics.This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag, compilerOptionName));
-                        }
-                    }
-                    else {
-                        reportNonDefaultExport(moduleSymbol, node);
+                return getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias);
+            }
+        }
+        function getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias) {
+            var _a;
+            var exportDefaultSymbol;
+            if (ts.isShorthandAmbientModuleSymbol(moduleSymbol)) {
+                exportDefaultSymbol = moduleSymbol;
+            }
+            else {
+                exportDefaultSymbol = resolveExportByName(moduleSymbol, "default" /* InternalSymbolName.Default */, node, dontResolveAlias);
+            }
+            var file = (_a = moduleSymbol.declarations) === null || _a === void 0 ? void 0 : _a.find(ts.isSourceFile);
+            var specifier = getModuleSpecifierForImportOrExport(node);
+            if (!specifier) {
+                return exportDefaultSymbol;
+            }
+            var hasDefaultOnly = isOnlyImportedAsDefault(specifier);
+            var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias, specifier);
+            if (!exportDefaultSymbol && !hasSyntheticDefault && !hasDefaultOnly) {
+                if (hasExportAssignmentSymbol(moduleSymbol)) {
+                    var compilerOptionName = moduleKind >= ts.ModuleKind.ES2015 ? "allowSyntheticDefaultImports" : "esModuleInterop";
+                    var exportEqualsSymbol = moduleSymbol.exports.get("export=" /* InternalSymbolName.ExportEquals */);
+                    var exportAssignment = exportEqualsSymbol.valueDeclaration;
+                    var err = error(node.name, ts.Diagnostics.Module_0_can_only_be_default_imported_using_the_1_flag, symbolToString(moduleSymbol), compilerOptionName);
+                    if (exportAssignment) {
+                        ts.addRelatedInfo(err, ts.createDiagnosticForNode(exportAssignment, ts.Diagnostics.This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag, compilerOptionName));
                     }
                 }
-                else if (hasSyntheticDefault || hasDefaultOnly) {
-                    // per emit behavior, a synthetic default overrides a "real" .default member if `__esModule` is not present
-                    var resolved = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
-                    markSymbolOfAliasDeclarationIfTypeOnly(node, moduleSymbol, resolved, /*overwriteTypeOnly*/ false);
-                    return resolved;
+                else if (ts.isImportClause(node)) {
+                    reportNonDefaultExport(moduleSymbol, node);
                 }
-                markSymbolOfAliasDeclarationIfTypeOnly(node, exportDefaultSymbol, /*finalTarget*/ undefined, /*overwriteTypeOnly*/ false);
-                return exportDefaultSymbol;
+                else {
+                    errorNoModuleMemberSymbol(moduleSymbol, moduleSymbol, node, ts.isImportOrExportSpecifier(node) && node.propertyName || node.name);
+                }
+            }
+            else if (hasSyntheticDefault || hasDefaultOnly) {
+                // per emit behavior, a synthetic default overrides a "real" .default member if `__esModule` is not present
+                var resolved = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
+                markSymbolOfAliasDeclarationIfTypeOnly(node, moduleSymbol, resolved, /*overwriteTypeOnly*/ false);
+                return resolved;
+            }
+            markSymbolOfAliasDeclarationIfTypeOnly(node, exportDefaultSymbol, /*finalTarget*/ undefined, /*overwriteTypeOnly*/ false);
+            return exportDefaultSymbol;
+        }
+        function getModuleSpecifierForImportOrExport(node) {
+            switch (node.kind) {
+                case 267 /* SyntaxKind.ImportClause */: return node.parent.moduleSpecifier;
+                case 265 /* SyntaxKind.ImportEqualsDeclaration */: return ts.isExternalModuleReference(node.moduleReference) ? node.moduleReference.expression : undefined;
+                case 268 /* SyntaxKind.NamespaceImport */: return node.parent.parent.moduleSpecifier;
+                case 270 /* SyntaxKind.ImportSpecifier */: return node.parent.parent.parent.moduleSpecifier;
+                case 275 /* SyntaxKind.ExportSpecifier */: return node.parent.parent.moduleSpecifier;
+                default: return ts.Debug.assertNever(node);
             }
         }
         function reportNonDefaultExport(moduleSymbol, node) {
@@ -51303,7 +51323,7 @@ var ts;
             }
         }
         function getExternalModuleMember(node, specifier, dontResolveAlias) {
-            var _a, _b;
+            var _a;
             if (dontResolveAlias === void 0) { dontResolveAlias = false; }
             var moduleSpecifier = ts.getExternalModuleRequireArgument(node) || node.moduleSpecifier;
             var moduleSymbol = resolveExternalModuleName(node, moduleSpecifier); // TODO: GH#18217
@@ -51339,29 +51359,33 @@ var ts;
                         combineValueAndTypeSymbols(symbolFromVariable, symbolFromModule) :
                         symbolFromModule || symbolFromVariable;
                     if (!symbol) {
-                        var moduleName = getFullyQualifiedName(moduleSymbol, node);
-                        var declarationName = ts.declarationNameToString(name);
-                        var suggestion = getSuggestedSymbolForNonexistentModule(name, targetSymbol);
-                        if (suggestion !== undefined) {
-                            var suggestionName = symbolToString(suggestion);
-                            var diagnostic = error(name, ts.Diagnostics._0_has_no_exported_member_named_1_Did_you_mean_2, moduleName, declarationName, suggestionName);
-                            if (suggestion.valueDeclaration) {
-                                ts.addRelatedInfo(diagnostic, ts.createDiagnosticForNode(suggestion.valueDeclaration, ts.Diagnostics._0_is_declared_here, suggestionName));
-                            }
-                        }
-                        else {
-                            if ((_b = moduleSymbol.exports) === null || _b === void 0 ? void 0 : _b.has("default" /* InternalSymbolName.Default */)) {
-                                error(name, ts.Diagnostics.Module_0_has_no_exported_member_1_Did_you_mean_to_use_import_1_from_0_instead, moduleName, declarationName);
-                            }
-                            else {
-                                reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName);
-                            }
-                        }
+                        errorNoModuleMemberSymbol(moduleSymbol, targetSymbol, node, name);
                     }
                     return symbol;
                 }
             }
         }
+        function errorNoModuleMemberSymbol(moduleSymbol, targetSymbol, node, name) {
+            var _a;
+            var moduleName = getFullyQualifiedName(moduleSymbol, node);
+            var declarationName = ts.declarationNameToString(name);
+            var suggestion = getSuggestedSymbolForNonexistentModule(name, targetSymbol);
+            if (suggestion !== undefined) {
+                var suggestionName = symbolToString(suggestion);
+                var diagnostic = error(name, ts.Diagnostics._0_has_no_exported_member_named_1_Did_you_mean_2, moduleName, declarationName, suggestionName);
+                if (suggestion.valueDeclaration) {
+                    ts.addRelatedInfo(diagnostic, ts.createDiagnosticForNode(suggestion.valueDeclaration, ts.Diagnostics._0_is_declared_here, suggestionName));
+                }
+            }
+            else {
+                if ((_a = moduleSymbol.exports) === null || _a === void 0 ? void 0 : _a.has("default" /* InternalSymbolName.Default */)) {
+                    error(name, ts.Diagnostics.Module_0_has_no_exported_member_1_Did_you_mean_to_use_import_1_from_0_instead, moduleName, declarationName);
+                }
+                else {
+                    reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName);
+                }
+            }
+        }
         function reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName) {
             var _a, _b;
             var localSymbol = (_b = (_a = moduleSymbol.valueDeclaration) === null || _a === void 0 ? void 0 : _a.locals) === null || _b === void 0 ? void 0 : _b.get(name.escapedText);
@@ -51407,6 +51431,13 @@ var ts;
             }
         }
         function getTargetOfImportSpecifier(node, dontResolveAlias) {
+            if (ts.isImportSpecifier(node) && ts.idText(node.propertyName || node.name) === "default" /* InternalSymbolName.Default */) {
+                var specifier = getModuleSpecifierForImportOrExport(node);
+                var moduleSymbol = specifier && resolveExternalModuleName(node, specifier);
+                if (moduleSymbol) {
+                    return getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias);
+                }
+            }
             var root = ts.isBindingElement(node) ? ts.getRootDeclaration(node) : node.parent.parent.parent;
             var commonJSPropertyAccess = getCommonJSPropertyAccess(root);
             var resolved = getExternalModuleMember(root, commonJSPropertyAccess || node, dontResolveAlias);
@@ -51428,6 +51459,13 @@ var ts;
             return resolved;
         }
         function getTargetOfExportSpecifier(node, meaning, dontResolveAlias) {
+            if (ts.idText(node.propertyName || node.name) === "default" /* InternalSymbolName.Default */) {
+                var specifier = getModuleSpecifierForImportOrExport(node);
+                var moduleSymbol = specifier && resolveExternalModuleName(node, specifier);
+                if (moduleSymbol) {
+                    return getTargetofModuleDefault(moduleSymbol, node, !!dontResolveAlias);
+                }
+            }
             var resolved = node.parent.parent.moduleSpecifier ?
                 getExternalModuleMember(node.parent.parent, node, dontResolveAlias) :
                 resolveEntityName(node.propertyName || node.name, meaning, /*ignoreErrors*/ false, dontResolveAlias);
@@ -62378,7 +62416,7 @@ var ts;
                 return includes & 8388608 /* TypeFlags.IncludesWildcard */ ? wildcardType : anyType;
             }
             if (!strictNullChecks && includes & 98304 /* TypeFlags.Nullable */) {
-                return includes & 32768 /* TypeFlags.Undefined */ ? undefinedType : nullType;
+                return includes & 16777216 /* TypeFlags.IncludesEmptyObject */ ? neverType : includes & 32768 /* TypeFlags.Undefined */ ? undefinedType : nullType;
             }
             if (includes & 4 /* TypeFlags.String */ && includes & (128 /* TypeFlags.StringLiteral */ | 134217728 /* TypeFlags.TemplateLiteral */ | 268435456 /* TypeFlags.StringMapping */) ||
                 includes & 8 /* TypeFlags.Number */ && includes & 256 /* TypeFlags.NumberLiteral */ ||
@@ -63068,7 +63106,7 @@ var ts;
             // (T | U)[K] -> T[K] | U[K] (reading)
             // (T | U)[K] -> T[K] & U[K] (writing)
             // (T & U)[K] -> T[K] & U[K]
-            if (objectType.flags & 3145728 /* TypeFlags.UnionOrIntersection */) {
+            if (objectType.flags & 1048576 /* TypeFlags.Union */ || objectType.flags & 2097152 /* TypeFlags.Intersection */ && !shouldDeferIndexType(objectType)) {
                 var types = ts.map(objectType.types, function (t) { return getSimplifiedType(getIndexedAccessType(t, indexType), writing); });
                 return objectType.flags & 2097152 /* TypeFlags.Intersection */ || writing ? getIntersectionType(types) : getUnionType(types);
             }
@@ -65476,7 +65514,7 @@ var ts;
             if (reduced !== type) {
                 return reduced;
             }
-            if (type.flags & 2097152 /* TypeFlags.Intersection */) {
+            if (type.flags & 2097152 /* TypeFlags.Intersection */ && ts.some(type.types, isEmptyAnonymousObjectType)) {
                 var normalizedTypes = ts.sameMap(type.types, function (t) { return getNormalizedType(t, writing); });
                 if (normalizedTypes !== type.types) {
                     return getIntersectionType(normalizedTypes);
@@ -66647,7 +66685,7 @@ var ts;
                                     // create a new chain for the constraint error
                                     resetErrorInfo(saveErrorInfo);
                                 }
-                                if (result = isRelatedTo(source, constraint, 2 /* RecursionFlags.Target */, reportErrors)) {
+                                if (result = isRelatedTo(source, constraint, 2 /* RecursionFlags.Target */, reportErrors, /* headMessage */ undefined, intersectionState)) {
                                     return result;
                                 }
                                 // prefer the shorter chain of the constraint comparison chain, and the direct comparison chain
@@ -66739,8 +66777,8 @@ var ts;
                         var skipTrue = !isTypeAssignableTo(getPermissiveInstantiation(c.checkType), getPermissiveInstantiation(c.extendsType));
                         var skipFalse = !skipTrue && isTypeAssignableTo(getRestrictiveInstantiation(c.checkType), getRestrictiveInstantiation(c.extendsType));
                         // TODO: Find a nice way to include potential conditional type breakdowns in error output, if they seem good (they usually don't)
-                        if (result = skipTrue ? -1 /* Ternary.True */ : isRelatedTo(source, getTrueTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false)) {
-                            result &= skipFalse ? -1 /* Ternary.True */ : isRelatedTo(source, getFalseTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false);
+                        if (result = skipTrue ? -1 /* Ternary.True */ : isRelatedTo(source, getTrueTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false, /*headMessage*/ undefined, intersectionState)) {
+                            result &= skipFalse ? -1 /* Ternary.True */ : isRelatedTo(source, getFalseTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false, /*headMessage*/ undefined, intersectionState);
                             if (result) {
                                 return result;
                             }
@@ -71769,7 +71807,7 @@ var ts;
                 var narrowedPropType = narrowType(propType);
                 return filterType(type, function (t) {
                     var discriminantType = getTypeOfPropertyOrIndexSignature(t, propName);
-                    return !(narrowedPropType.flags & 131072 /* TypeFlags.Never */) && isTypeComparableTo(narrowedPropType, discriminantType);
+                    return !(narrowedPropType.flags & 131072 /* TypeFlags.Never */) && areTypesComparable(narrowedPropType, discriminantType);
                 });
             }
             function narrowTypeByDiscriminantProperty(type, access, operator, value, assumeTrue) {
@@ -71818,7 +71856,7 @@ var ts;
             }
             function narrowByInKeyword(type, name, assumeTrue) {
                 if (type.flags & 1048576 /* TypeFlags.Union */
-                    || type.flags & 524288 /* TypeFlags.Object */ && declaredType !== type
+                    || type.flags & 524288 /* TypeFlags.Object */ && declaredType !== type && !(declaredType === unknownType && isEmptyAnonymousObjectType(type))
                     || ts.isThisTypeParameter(type)
                     || type.flags & 2097152 /* TypeFlags.Intersection */ && ts.every(type.types, function (t) { return t.symbol !== globalThisSymbol; })) {
                     return filterType(type, function (t) { return isTypePresencePossible(t, name, assumeTrue); });
@@ -71951,14 +71989,18 @@ var ts;
                     assumeTrue = !assumeTrue;
                 }
                 var valueType = getTypeOfExpression(value);
-                if ((type.flags & 2 /* TypeFlags.Unknown */) && assumeTrue && (operator === 36 /* SyntaxKind.EqualsEqualsEqualsToken */ || operator === 37 /* SyntaxKind.ExclamationEqualsEqualsToken */)) {
+                if (((type.flags & 2 /* TypeFlags.Unknown */) || isEmptyAnonymousObjectType(type) && !(valueType.flags & 98304 /* TypeFlags.Nullable */)) &&
+                    assumeTrue &&
+                    (operator === 36 /* SyntaxKind.EqualsEqualsEqualsToken */ || operator === 37 /* SyntaxKind.ExclamationEqualsEqualsToken */)) {
                     if (valueType.flags & (131068 /* TypeFlags.Primitive */ | 67108864 /* TypeFlags.NonPrimitive */)) {
                         return valueType;
                     }
                     if (valueType.flags & 524288 /* TypeFlags.Object */) {
                         return nonPrimitiveType;
                     }
-                    return type;
+                    if (type.flags & 2 /* TypeFlags.Unknown */) {
+                        return type;
+                    }
                 }
                 if (valueType.flags & 98304 /* TypeFlags.Nullable */) {
                     if (!strictNullChecks) {
@@ -72417,7 +72459,9 @@ var ts;
                 !!(type.flags & 465829888 /* TypeFlags.Instantiable */ && getBaseConstraintOrType(type).flags & (98304 /* TypeFlags.Nullable */ | 1048576 /* TypeFlags.Union */));
         }
         function isGenericTypeWithoutNullableConstraint(type) {
-            return !!(type.flags & 465829888 /* TypeFlags.Instantiable */ && !maybeTypeOfKind(getBaseConstraintOrType(type), 98304 /* TypeFlags.Nullable */));
+            return type.flags & 2097152 /* TypeFlags.Intersection */ ?
+                ts.some(type.types, isGenericTypeWithoutNullableConstraint) :
+                !!(type.flags & 465829888 /* TypeFlags.Instantiable */ && !maybeTypeOfKind(getBaseConstraintOrType(type), 98304 /* TypeFlags.Nullable */));
         }
         function hasContextualTypeWithNoGenericTypes(node, checkMode) {
             // Computing the contextual type for a child of a JSX element involves resolving the type of the
@@ -127114,9 +127158,7 @@ var ts;
                 }
             }
         }
-        var seenRefs = buildInfoPath ? new ts.Set() : undefined;
         var buildInfoCacheEntry = state.buildInfoCache.get(resolvedPath);
-        seenRefs === null || seenRefs === void 0 ? void 0 : seenRefs.add(resolvedPath);
         /** Inputs are up-to-date, just need either timestamp update or bundle prepend manipulation to make it look up-to-date */
         var pseudoUpToDate = false;
         var usesPrepend = false;
@@ -127131,7 +127173,7 @@ var ts;
                     continue;
                 }
                 // Check if tsbuildinfo path is shared, then we need to rebuild
-                if (buildInfoCacheEntry && hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig, resolvedRefPath)) {
+                if (buildInfoCacheEntry && hasSameBuildInfo(state, buildInfoCacheEntry, resolvedRefPath)) {
                     return {
                         type: ts.UpToDateStatusType.OutOfDateWithUpstream,
                         outOfDateOutputFileName: buildInfoPath,
@@ -127189,25 +127231,9 @@ var ts;
             oldestOutputFileName: oldestOutputFileName
         };
     }
-    function hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig, resolvedRefPath) {
-        if (seenRefs.has(resolvedRefPath))
-            return false;
-        seenRefs.add(resolvedRefPath);
+    function hasSameBuildInfo(state, buildInfoCacheEntry, resolvedRefPath) {
         var refBuildInfo = state.buildInfoCache.get(resolvedRefPath);
-        if (refBuildInfo.path === buildInfoCacheEntry.path)
-            return true;
-        if (resolvedConfig.projectReferences) {
-            // Check references
-            for (var _i = 0, _a = resolvedConfig.projectReferences; _i < _a.length; _i++) {
-                var ref = _a[_i];
-                var resolvedRef = ts.resolveProjectReferencePath(ref);
-                var resolvedRefPath_1 = toResolvedConfigFilePath(state, resolvedRef);
-                var resolvedConfig_1 = parseConfigFile(state, resolvedRef, resolvedRefPath_1);
-                if (hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig_1, resolvedRefPath_1))
-                    return true;
-            }
-        }
-        return false;
+        return refBuildInfo.path === buildInfoCacheEntry.path;
     }
     function getUpToDateStatus(state, project, resolvedPath) {
         if (project === undefined) {
diff --git a/lib/typescriptServices.js b/lib/typescriptServices.js
index 9e45164b7c4c9..61b1259b561f8 100644
--- a/lib/typescriptServices.js
+++ b/lib/typescriptServices.js
@@ -294,7 +294,7 @@ var ts;
     // The following is baselined as a literal template type without intervention
     /** The version of the TypeScript compiler release */
     // eslint-disable-next-line @typescript-eslint/no-inferrable-types
-    ts.version = "4.8.2";
+    ts.version = "4.8.3";
     /* @internal */
     var Comparison;
     (function (Comparison) {
@@ -9060,7 +9060,7 @@ var ts;
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_node_Try_npm_i_save_dev_types_Slashnode_and_then_add_node_to_the_types_field_in_your_tsconfig: diag(2591, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_node_Try_npm_i_save_dev_types_Slashno_2591", "Cannot find name '{0}'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node` and then add 'node' to the types field in your tsconfig."),
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_jQuery_Try_npm_i_save_dev_types_Slashjquery_and_then_add_jquery_to_the_types_field_in_your_tsconfig: diag(2592, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_jQuery_Try_npm_i_save_dev_types_Slash_2592", "Cannot find name '{0}'. Do you need to install type definitions for jQuery? Try `npm i --save-dev @types/jquery` and then add 'jquery' to the types field in your tsconfig."),
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_a_test_runner_Try_npm_i_save_dev_types_Slashjest_or_npm_i_save_dev_types_Slashmocha_and_then_add_jest_or_mocha_to_the_types_field_in_your_tsconfig: diag(2593, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_a_test_runner_Try_npm_i_save_dev_type_2593", "Cannot find name '{0}'. Do you need to install type definitions for a test runner? Try `npm i --save-dev @types/jest` or `npm i --save-dev @types/mocha` and then add 'jest' or 'mocha' to the types field in your tsconfig."),
-        This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag: diag(2594, ts.DiagnosticCategory.Error, "This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the__2594", "This module is declared with using 'export =', and can only be used with a default import when using the '{0}' flag."),
+        This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag: diag(2594, ts.DiagnosticCategory.Error, "This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag_2594", "This module is declared with 'export =', and can only be used with a default import when using the '{0}' flag."),
         _0_can_only_be_imported_by_using_a_default_import: diag(2595, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_using_a_default_import_2595", "'{0}' can only be imported by using a default import."),
         _0_can_only_be_imported_by_turning_on_the_esModuleInterop_flag_and_using_a_default_import: diag(2596, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_turning_on_the_esModuleInterop_flag_and_using_a_default_import_2596", "'{0}' can only be imported by turning on the 'esModuleInterop' flag and using a default import."),
         _0_can_only_be_imported_by_using_a_require_call_or_by_using_a_default_import: diag(2597, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_using_a_require_call_or_by_using_a_default_import_2597", "'{0}' can only be imported by using a 'require' call or by using a default import."),
@@ -44821,7 +44821,7 @@ var ts;
                 var _a, _b;
                 if (path === undefined)
                     return path;
-                return ts.hostGetCanonicalFileName({ useCaseSensitiveFileNames: useCaseSensitiveFileNames })(ts.getNormalizedAbsolutePath(path, (_b = (_a = state.host).getCurrentDirectory) === null || _b === void 0 ? void 0 : _b.call(_a)));
+                return ts.getNormalizedAbsolutePath(path, (_b = (_a = state.host).getCurrentDirectory) === null || _b === void 0 ? void 0 : _b.call(_a));
             }
             function combineDirectoryPath(root, dir) {
                 return ts.ensureTrailingDirectorySeparator(ts.combinePaths(root, dir));
@@ -44841,7 +44841,7 @@ var ts;
                 if ((extensions === Extensions.TypeScript || extensions === Extensions.JavaScript || extensions === Extensions.Json)
                     && (state.compilerOptions.declarationDir || state.compilerOptions.outDir)
                     && finalPath.indexOf("/node_modules/") === -1
-                    && (state.compilerOptions.configFile ? ts.startsWith(toAbsolutePath(state.compilerOptions.configFile.fileName), scope.packageDirectory) : true)) {
+                    && (state.compilerOptions.configFile ? ts.containsPath(scope.packageDirectory, toAbsolutePath(state.compilerOptions.configFile.fileName), !useCaseSensitiveFileNames()) : true)) {
                     // So that all means we'll only try these guesses for files outside `node_modules` in a directory where the `package.json` and `tsconfig.json` are siblings.
                     // Even with all that, we still don't know if the root of the output file structure will be (relative to the package file)
                     // `.`, `./src` or any other deeper directory structure. (If project references are used, it's definitely `.` by fiat, so that should be pretty common.)
@@ -44897,7 +44897,7 @@ var ts;
                         var candidateDirectories = getOutputDirectoriesForBaseDirectory(commonSourceDirGuess);
                         for (var _e = 0, candidateDirectories_1 = candidateDirectories; _e < candidateDirectories_1.length; _e++) {
                             var candidateDir = candidateDirectories_1[_e];
-                            if (ts.startsWith(finalPath, candidateDir)) {
+                            if (ts.containsPath(candidateDir, finalPath, !useCaseSensitiveFileNames())) {
                                 // The matched export is looking up something in either the out declaration or js dir, now map the written path back into the source dir and source extension
                                 var pathFragment = finalPath.slice(candidateDir.length + 1); // +1 to also remove directory seperator
                                 var possibleInputBase = ts.combinePaths(commonSourceDirGuess, pathFragment);
@@ -51179,41 +51179,61 @@ var ts;
             return typeof file.externalModuleIndicator !== "object" && !resolveExportByName(moduleSymbol, ts.escapeLeadingUnderscores("__esModule"), /*sourceNode*/ undefined, dontResolveAlias);
         }
         function getTargetOfImportClause(node, dontResolveAlias) {
-            var _a;
             var moduleSymbol = resolveExternalModuleName(node, node.parent.moduleSpecifier);
             if (moduleSymbol) {
-                var exportDefaultSymbol = void 0;
-                if (ts.isShorthandAmbientModuleSymbol(moduleSymbol)) {
-                    exportDefaultSymbol = moduleSymbol;
-                }
-                else {
-                    exportDefaultSymbol = resolveExportByName(moduleSymbol, "default" /* InternalSymbolName.Default */, node, dontResolveAlias);
-                }
-                var file = (_a = moduleSymbol.declarations) === null || _a === void 0 ? void 0 : _a.find(ts.isSourceFile);
-                var hasDefaultOnly = isOnlyImportedAsDefault(node.parent.moduleSpecifier);
-                var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias, node.parent.moduleSpecifier);
-                if (!exportDefaultSymbol && !hasSyntheticDefault && !hasDefaultOnly) {
-                    if (hasExportAssignmentSymbol(moduleSymbol)) {
-                        var compilerOptionName = moduleKind >= ts.ModuleKind.ES2015 ? "allowSyntheticDefaultImports" : "esModuleInterop";
-                        var exportEqualsSymbol = moduleSymbol.exports.get("export=" /* InternalSymbolName.ExportEquals */);
-                        var exportAssignment = exportEqualsSymbol.valueDeclaration;
-                        var err = error(node.name, ts.Diagnostics.Module_0_can_only_be_default_imported_using_the_1_flag, symbolToString(moduleSymbol), compilerOptionName);
-                        if (exportAssignment) {
-                            ts.addRelatedInfo(err, ts.createDiagnosticForNode(exportAssignment, ts.Diagnostics.This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag, compilerOptionName));
-                        }
-                    }
-                    else {
-                        reportNonDefaultExport(moduleSymbol, node);
+                return getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias);
+            }
+        }
+        function getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias) {
+            var _a;
+            var exportDefaultSymbol;
+            if (ts.isShorthandAmbientModuleSymbol(moduleSymbol)) {
+                exportDefaultSymbol = moduleSymbol;
+            }
+            else {
+                exportDefaultSymbol = resolveExportByName(moduleSymbol, "default" /* InternalSymbolName.Default */, node, dontResolveAlias);
+            }
+            var file = (_a = moduleSymbol.declarations) === null || _a === void 0 ? void 0 : _a.find(ts.isSourceFile);
+            var specifier = getModuleSpecifierForImportOrExport(node);
+            if (!specifier) {
+                return exportDefaultSymbol;
+            }
+            var hasDefaultOnly = isOnlyImportedAsDefault(specifier);
+            var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias, specifier);
+            if (!exportDefaultSymbol && !hasSyntheticDefault && !hasDefaultOnly) {
+                if (hasExportAssignmentSymbol(moduleSymbol)) {
+                    var compilerOptionName = moduleKind >= ts.ModuleKind.ES2015 ? "allowSyntheticDefaultImports" : "esModuleInterop";
+                    var exportEqualsSymbol = moduleSymbol.exports.get("export=" /* InternalSymbolName.ExportEquals */);
+                    var exportAssignment = exportEqualsSymbol.valueDeclaration;
+                    var err = error(node.name, ts.Diagnostics.Module_0_can_only_be_default_imported_using_the_1_flag, symbolToString(moduleSymbol), compilerOptionName);
+                    if (exportAssignment) {
+                        ts.addRelatedInfo(err, ts.createDiagnosticForNode(exportAssignment, ts.Diagnostics.This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag, compilerOptionName));
                     }
                 }
-                else if (hasSyntheticDefault || hasDefaultOnly) {
-                    // per emit behavior, a synthetic default overrides a "real" .default member if `__esModule` is not present
-                    var resolved = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
-                    markSymbolOfAliasDeclarationIfTypeOnly(node, moduleSymbol, resolved, /*overwriteTypeOnly*/ false);
-                    return resolved;
+                else if (ts.isImportClause(node)) {
+                    reportNonDefaultExport(moduleSymbol, node);
                 }
-                markSymbolOfAliasDeclarationIfTypeOnly(node, exportDefaultSymbol, /*finalTarget*/ undefined, /*overwriteTypeOnly*/ false);
-                return exportDefaultSymbol;
+                else {
+                    errorNoModuleMemberSymbol(moduleSymbol, moduleSymbol, node, ts.isImportOrExportSpecifier(node) && node.propertyName || node.name);
+                }
+            }
+            else if (hasSyntheticDefault || hasDefaultOnly) {
+                // per emit behavior, a synthetic default overrides a "real" .default member if `__esModule` is not present
+                var resolved = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
+                markSymbolOfAliasDeclarationIfTypeOnly(node, moduleSymbol, resolved, /*overwriteTypeOnly*/ false);
+                return resolved;
+            }
+            markSymbolOfAliasDeclarationIfTypeOnly(node, exportDefaultSymbol, /*finalTarget*/ undefined, /*overwriteTypeOnly*/ false);
+            return exportDefaultSymbol;
+        }
+        function getModuleSpecifierForImportOrExport(node) {
+            switch (node.kind) {
+                case 267 /* SyntaxKind.ImportClause */: return node.parent.moduleSpecifier;
+                case 265 /* SyntaxKind.ImportEqualsDeclaration */: return ts.isExternalModuleReference(node.moduleReference) ? node.moduleReference.expression : undefined;
+                case 268 /* SyntaxKind.NamespaceImport */: return node.parent.parent.moduleSpecifier;
+                case 270 /* SyntaxKind.ImportSpecifier */: return node.parent.parent.parent.moduleSpecifier;
+                case 275 /* SyntaxKind.ExportSpecifier */: return node.parent.parent.moduleSpecifier;
+                default: return ts.Debug.assertNever(node);
             }
         }
         function reportNonDefaultExport(moduleSymbol, node) {
@@ -51303,7 +51323,7 @@ var ts;
             }
         }
         function getExternalModuleMember(node, specifier, dontResolveAlias) {
-            var _a, _b;
+            var _a;
             if (dontResolveAlias === void 0) { dontResolveAlias = false; }
             var moduleSpecifier = ts.getExternalModuleRequireArgument(node) || node.moduleSpecifier;
             var moduleSymbol = resolveExternalModuleName(node, moduleSpecifier); // TODO: GH#18217
@@ -51339,29 +51359,33 @@ var ts;
                         combineValueAndTypeSymbols(symbolFromVariable, symbolFromModule) :
                         symbolFromModule || symbolFromVariable;
                     if (!symbol) {
-                        var moduleName = getFullyQualifiedName(moduleSymbol, node);
-                        var declarationName = ts.declarationNameToString(name);
-                        var suggestion = getSuggestedSymbolForNonexistentModule(name, targetSymbol);
-                        if (suggestion !== undefined) {
-                            var suggestionName = symbolToString(suggestion);
-                            var diagnostic = error(name, ts.Diagnostics._0_has_no_exported_member_named_1_Did_you_mean_2, moduleName, declarationName, suggestionName);
-                            if (suggestion.valueDeclaration) {
-                                ts.addRelatedInfo(diagnostic, ts.createDiagnosticForNode(suggestion.valueDeclaration, ts.Diagnostics._0_is_declared_here, suggestionName));
-                            }
-                        }
-                        else {
-                            if ((_b = moduleSymbol.exports) === null || _b === void 0 ? void 0 : _b.has("default" /* InternalSymbolName.Default */)) {
-                                error(name, ts.Diagnostics.Module_0_has_no_exported_member_1_Did_you_mean_to_use_import_1_from_0_instead, moduleName, declarationName);
-                            }
-                            else {
-                                reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName);
-                            }
-                        }
+                        errorNoModuleMemberSymbol(moduleSymbol, targetSymbol, node, name);
                     }
                     return symbol;
                 }
             }
         }
+        function errorNoModuleMemberSymbol(moduleSymbol, targetSymbol, node, name) {
+            var _a;
+            var moduleName = getFullyQualifiedName(moduleSymbol, node);
+            var declarationName = ts.declarationNameToString(name);
+            var suggestion = getSuggestedSymbolForNonexistentModule(name, targetSymbol);
+            if (suggestion !== undefined) {
+                var suggestionName = symbolToString(suggestion);
+                var diagnostic = error(name, ts.Diagnostics._0_has_no_exported_member_named_1_Did_you_mean_2, moduleName, declarationName, suggestionName);
+                if (suggestion.valueDeclaration) {
+                    ts.addRelatedInfo(diagnostic, ts.createDiagnosticForNode(suggestion.valueDeclaration, ts.Diagnostics._0_is_declared_here, suggestionName));
+                }
+            }
+            else {
+                if ((_a = moduleSymbol.exports) === null || _a === void 0 ? void 0 : _a.has("default" /* InternalSymbolName.Default */)) {
+                    error(name, ts.Diagnostics.Module_0_has_no_exported_member_1_Did_you_mean_to_use_import_1_from_0_instead, moduleName, declarationName);
+                }
+                else {
+                    reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName);
+                }
+            }
+        }
         function reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName) {
             var _a, _b;
             var localSymbol = (_b = (_a = moduleSymbol.valueDeclaration) === null || _a === void 0 ? void 0 : _a.locals) === null || _b === void 0 ? void 0 : _b.get(name.escapedText);
@@ -51407,6 +51431,13 @@ var ts;
             }
         }
         function getTargetOfImportSpecifier(node, dontResolveAlias) {
+            if (ts.isImportSpecifier(node) && ts.idText(node.propertyName || node.name) === "default" /* InternalSymbolName.Default */) {
+                var specifier = getModuleSpecifierForImportOrExport(node);
+                var moduleSymbol = specifier && resolveExternalModuleName(node, specifier);
+                if (moduleSymbol) {
+                    return getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias);
+                }
+            }
             var root = ts.isBindingElement(node) ? ts.getRootDeclaration(node) : node.parent.parent.parent;
             var commonJSPropertyAccess = getCommonJSPropertyAccess(root);
             var resolved = getExternalModuleMember(root, commonJSPropertyAccess || node, dontResolveAlias);
@@ -51428,6 +51459,13 @@ var ts;
             return resolved;
         }
         function getTargetOfExportSpecifier(node, meaning, dontResolveAlias) {
+            if (ts.idText(node.propertyName || node.name) === "default" /* InternalSymbolName.Default */) {
+                var specifier = getModuleSpecifierForImportOrExport(node);
+                var moduleSymbol = specifier && resolveExternalModuleName(node, specifier);
+                if (moduleSymbol) {
+                    return getTargetofModuleDefault(moduleSymbol, node, !!dontResolveAlias);
+                }
+            }
             var resolved = node.parent.parent.moduleSpecifier ?
                 getExternalModuleMember(node.parent.parent, node, dontResolveAlias) :
                 resolveEntityName(node.propertyName || node.name, meaning, /*ignoreErrors*/ false, dontResolveAlias);
@@ -62378,7 +62416,7 @@ var ts;
                 return includes & 8388608 /* TypeFlags.IncludesWildcard */ ? wildcardType : anyType;
             }
             if (!strictNullChecks && includes & 98304 /* TypeFlags.Nullable */) {
-                return includes & 32768 /* TypeFlags.Undefined */ ? undefinedType : nullType;
+                return includes & 16777216 /* TypeFlags.IncludesEmptyObject */ ? neverType : includes & 32768 /* TypeFlags.Undefined */ ? undefinedType : nullType;
             }
             if (includes & 4 /* TypeFlags.String */ && includes & (128 /* TypeFlags.StringLiteral */ | 134217728 /* TypeFlags.TemplateLiteral */ | 268435456 /* TypeFlags.StringMapping */) ||
                 includes & 8 /* TypeFlags.Number */ && includes & 256 /* TypeFlags.NumberLiteral */ ||
@@ -63068,7 +63106,7 @@ var ts;
             // (T | U)[K] -> T[K] | U[K] (reading)
             // (T | U)[K] -> T[K] & U[K] (writing)
             // (T & U)[K] -> T[K] & U[K]
-            if (objectType.flags & 3145728 /* TypeFlags.UnionOrIntersection */) {
+            if (objectType.flags & 1048576 /* TypeFlags.Union */ || objectType.flags & 2097152 /* TypeFlags.Intersection */ && !shouldDeferIndexType(objectType)) {
                 var types = ts.map(objectType.types, function (t) { return getSimplifiedType(getIndexedAccessType(t, indexType), writing); });
                 return objectType.flags & 2097152 /* TypeFlags.Intersection */ || writing ? getIntersectionType(types) : getUnionType(types);
             }
@@ -65476,7 +65514,7 @@ var ts;
             if (reduced !== type) {
                 return reduced;
             }
-            if (type.flags & 2097152 /* TypeFlags.Intersection */) {
+            if (type.flags & 2097152 /* TypeFlags.Intersection */ && ts.some(type.types, isEmptyAnonymousObjectType)) {
                 var normalizedTypes = ts.sameMap(type.types, function (t) { return getNormalizedType(t, writing); });
                 if (normalizedTypes !== type.types) {
                     return getIntersectionType(normalizedTypes);
@@ -66647,7 +66685,7 @@ var ts;
                                     // create a new chain for the constraint error
                                     resetErrorInfo(saveErrorInfo);
                                 }
-                                if (result = isRelatedTo(source, constraint, 2 /* RecursionFlags.Target */, reportErrors)) {
+                                if (result = isRelatedTo(source, constraint, 2 /* RecursionFlags.Target */, reportErrors, /* headMessage */ undefined, intersectionState)) {
                                     return result;
                                 }
                                 // prefer the shorter chain of the constraint comparison chain, and the direct comparison chain
@@ -66739,8 +66777,8 @@ var ts;
                         var skipTrue = !isTypeAssignableTo(getPermissiveInstantiation(c.checkType), getPermissiveInstantiation(c.extendsType));
                         var skipFalse = !skipTrue && isTypeAssignableTo(getRestrictiveInstantiation(c.checkType), getRestrictiveInstantiation(c.extendsType));
                         // TODO: Find a nice way to include potential conditional type breakdowns in error output, if they seem good (they usually don't)
-                        if (result = skipTrue ? -1 /* Ternary.True */ : isRelatedTo(source, getTrueTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false)) {
-                            result &= skipFalse ? -1 /* Ternary.True */ : isRelatedTo(source, getFalseTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false);
+                        if (result = skipTrue ? -1 /* Ternary.True */ : isRelatedTo(source, getTrueTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false, /*headMessage*/ undefined, intersectionState)) {
+                            result &= skipFalse ? -1 /* Ternary.True */ : isRelatedTo(source, getFalseTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false, /*headMessage*/ undefined, intersectionState);
                             if (result) {
                                 return result;
                             }
@@ -71769,7 +71807,7 @@ var ts;
                 var narrowedPropType = narrowType(propType);
                 return filterType(type, function (t) {
                     var discriminantType = getTypeOfPropertyOrIndexSignature(t, propName);
-                    return !(narrowedPropType.flags & 131072 /* TypeFlags.Never */) && isTypeComparableTo(narrowedPropType, discriminantType);
+                    return !(narrowedPropType.flags & 131072 /* TypeFlags.Never */) && areTypesComparable(narrowedPropType, discriminantType);
                 });
             }
             function narrowTypeByDiscriminantProperty(type, access, operator, value, assumeTrue) {
@@ -71818,7 +71856,7 @@ var ts;
             }
             function narrowByInKeyword(type, name, assumeTrue) {
                 if (type.flags & 1048576 /* TypeFlags.Union */
-                    || type.flags & 524288 /* TypeFlags.Object */ && declaredType !== type
+                    || type.flags & 524288 /* TypeFlags.Object */ && declaredType !== type && !(declaredType === unknownType && isEmptyAnonymousObjectType(type))
                     || ts.isThisTypeParameter(type)
                     || type.flags & 2097152 /* TypeFlags.Intersection */ && ts.every(type.types, function (t) { return t.symbol !== globalThisSymbol; })) {
                     return filterType(type, function (t) { return isTypePresencePossible(t, name, assumeTrue); });
@@ -71951,14 +71989,18 @@ var ts;
                     assumeTrue = !assumeTrue;
                 }
                 var valueType = getTypeOfExpression(value);
-                if ((type.flags & 2 /* TypeFlags.Unknown */) && assumeTrue && (operator === 36 /* SyntaxKind.EqualsEqualsEqualsToken */ || operator === 37 /* SyntaxKind.ExclamationEqualsEqualsToken */)) {
+                if (((type.flags & 2 /* TypeFlags.Unknown */) || isEmptyAnonymousObjectType(type) && !(valueType.flags & 98304 /* TypeFlags.Nullable */)) &&
+                    assumeTrue &&
+                    (operator === 36 /* SyntaxKind.EqualsEqualsEqualsToken */ || operator === 37 /* SyntaxKind.ExclamationEqualsEqualsToken */)) {
                     if (valueType.flags & (131068 /* TypeFlags.Primitive */ | 67108864 /* TypeFlags.NonPrimitive */)) {
                         return valueType;
                     }
                     if (valueType.flags & 524288 /* TypeFlags.Object */) {
                         return nonPrimitiveType;
                     }
-                    return type;
+                    if (type.flags & 2 /* TypeFlags.Unknown */) {
+                        return type;
+                    }
                 }
                 if (valueType.flags & 98304 /* TypeFlags.Nullable */) {
                     if (!strictNullChecks) {
@@ -72417,7 +72459,9 @@ var ts;
                 !!(type.flags & 465829888 /* TypeFlags.Instantiable */ && getBaseConstraintOrType(type).flags & (98304 /* TypeFlags.Nullable */ | 1048576 /* TypeFlags.Union */));
         }
         function isGenericTypeWithoutNullableConstraint(type) {
-            return !!(type.flags & 465829888 /* TypeFlags.Instantiable */ && !maybeTypeOfKind(getBaseConstraintOrType(type), 98304 /* TypeFlags.Nullable */));
+            return type.flags & 2097152 /* TypeFlags.Intersection */ ?
+                ts.some(type.types, isGenericTypeWithoutNullableConstraint) :
+                !!(type.flags & 465829888 /* TypeFlags.Instantiable */ && !maybeTypeOfKind(getBaseConstraintOrType(type), 98304 /* TypeFlags.Nullable */));
         }
         function hasContextualTypeWithNoGenericTypes(node, checkMode) {
             // Computing the contextual type for a child of a JSX element involves resolving the type of the
@@ -127114,9 +127158,7 @@ var ts;
                 }
             }
         }
-        var seenRefs = buildInfoPath ? new ts.Set() : undefined;
         var buildInfoCacheEntry = state.buildInfoCache.get(resolvedPath);
-        seenRefs === null || seenRefs === void 0 ? void 0 : seenRefs.add(resolvedPath);
         /** Inputs are up-to-date, just need either timestamp update or bundle prepend manipulation to make it look up-to-date */
         var pseudoUpToDate = false;
         var usesPrepend = false;
@@ -127131,7 +127173,7 @@ var ts;
                     continue;
                 }
                 // Check if tsbuildinfo path is shared, then we need to rebuild
-                if (buildInfoCacheEntry && hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig, resolvedRefPath)) {
+                if (buildInfoCacheEntry && hasSameBuildInfo(state, buildInfoCacheEntry, resolvedRefPath)) {
                     return {
                         type: ts.UpToDateStatusType.OutOfDateWithUpstream,
                         outOfDateOutputFileName: buildInfoPath,
@@ -127189,25 +127231,9 @@ var ts;
             oldestOutputFileName: oldestOutputFileName
         };
     }
-    function hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig, resolvedRefPath) {
-        if (seenRefs.has(resolvedRefPath))
-            return false;
-        seenRefs.add(resolvedRefPath);
+    function hasSameBuildInfo(state, buildInfoCacheEntry, resolvedRefPath) {
         var refBuildInfo = state.buildInfoCache.get(resolvedRefPath);
-        if (refBuildInfo.path === buildInfoCacheEntry.path)
-            return true;
-        if (resolvedConfig.projectReferences) {
-            // Check references
-            for (var _i = 0, _a = resolvedConfig.projectReferences; _i < _a.length; _i++) {
-                var ref = _a[_i];
-                var resolvedRef = ts.resolveProjectReferencePath(ref);
-                var resolvedRefPath_1 = toResolvedConfigFilePath(state, resolvedRef);
-                var resolvedConfig_1 = parseConfigFile(state, resolvedRef, resolvedRefPath_1);
-                if (hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig_1, resolvedRefPath_1))
-                    return true;
-            }
-        }
-        return false;
+        return refBuildInfo.path === buildInfoCacheEntry.path;
     }
     function getUpToDateStatus(state, project, resolvedPath) {
         if (project === undefined) {
diff --git a/lib/typingsInstaller.js b/lib/typingsInstaller.js
index 8ab14c8266cf2..9303e787c1ef4 100644
--- a/lib/typingsInstaller.js
+++ b/lib/typingsInstaller.js
@@ -89,7 +89,7 @@ var ts;
     // The following is baselined as a literal template type without intervention
     /** The version of the TypeScript compiler release */
     // eslint-disable-next-line @typescript-eslint/no-inferrable-types
-    ts.version = "4.8.2";
+    ts.version = "4.8.3";
     /* @internal */
     var Comparison;
     (function (Comparison) {
@@ -8855,7 +8855,7 @@ var ts;
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_node_Try_npm_i_save_dev_types_Slashnode_and_then_add_node_to_the_types_field_in_your_tsconfig: diag(2591, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_node_Try_npm_i_save_dev_types_Slashno_2591", "Cannot find name '{0}'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node` and then add 'node' to the types field in your tsconfig."),
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_jQuery_Try_npm_i_save_dev_types_Slashjquery_and_then_add_jquery_to_the_types_field_in_your_tsconfig: diag(2592, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_jQuery_Try_npm_i_save_dev_types_Slash_2592", "Cannot find name '{0}'. Do you need to install type definitions for jQuery? Try `npm i --save-dev @types/jquery` and then add 'jquery' to the types field in your tsconfig."),
         Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_a_test_runner_Try_npm_i_save_dev_types_Slashjest_or_npm_i_save_dev_types_Slashmocha_and_then_add_jest_or_mocha_to_the_types_field_in_your_tsconfig: diag(2593, ts.DiagnosticCategory.Error, "Cannot_find_name_0_Do_you_need_to_install_type_definitions_for_a_test_runner_Try_npm_i_save_dev_type_2593", "Cannot find name '{0}'. Do you need to install type definitions for a test runner? Try `npm i --save-dev @types/jest` or `npm i --save-dev @types/mocha` and then add 'jest' or 'mocha' to the types field in your tsconfig."),
-        This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag: diag(2594, ts.DiagnosticCategory.Error, "This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the__2594", "This module is declared with using 'export =', and can only be used with a default import when using the '{0}' flag."),
+        This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag: diag(2594, ts.DiagnosticCategory.Error, "This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag_2594", "This module is declared with 'export =', and can only be used with a default import when using the '{0}' flag."),
         _0_can_only_be_imported_by_using_a_default_import: diag(2595, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_using_a_default_import_2595", "'{0}' can only be imported by using a default import."),
         _0_can_only_be_imported_by_turning_on_the_esModuleInterop_flag_and_using_a_default_import: diag(2596, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_turning_on_the_esModuleInterop_flag_and_using_a_default_import_2596", "'{0}' can only be imported by turning on the 'esModuleInterop' flag and using a default import."),
         _0_can_only_be_imported_by_using_a_require_call_or_by_using_a_default_import: diag(2597, ts.DiagnosticCategory.Error, "_0_can_only_be_imported_by_using_a_require_call_or_by_using_a_default_import_2597", "'{0}' can only be imported by using a 'require' call or by using a default import."),
@@ -44616,7 +44616,7 @@ var ts;
                 var _a, _b;
                 if (path === undefined)
                     return path;
-                return ts.hostGetCanonicalFileName({ useCaseSensitiveFileNames: useCaseSensitiveFileNames })(ts.getNormalizedAbsolutePath(path, (_b = (_a = state.host).getCurrentDirectory) === null || _b === void 0 ? void 0 : _b.call(_a)));
+                return ts.getNormalizedAbsolutePath(path, (_b = (_a = state.host).getCurrentDirectory) === null || _b === void 0 ? void 0 : _b.call(_a));
             }
             function combineDirectoryPath(root, dir) {
                 return ts.ensureTrailingDirectorySeparator(ts.combinePaths(root, dir));
@@ -44636,7 +44636,7 @@ var ts;
                 if ((extensions === Extensions.TypeScript || extensions === Extensions.JavaScript || extensions === Extensions.Json)
                     && (state.compilerOptions.declarationDir || state.compilerOptions.outDir)
                     && finalPath.indexOf("/node_modules/") === -1
-                    && (state.compilerOptions.configFile ? ts.startsWith(toAbsolutePath(state.compilerOptions.configFile.fileName), scope.packageDirectory) : true)) {
+                    && (state.compilerOptions.configFile ? ts.containsPath(scope.packageDirectory, toAbsolutePath(state.compilerOptions.configFile.fileName), !useCaseSensitiveFileNames()) : true)) {
                     // So that all means we'll only try these guesses for files outside `node_modules` in a directory where the `package.json` and `tsconfig.json` are siblings.
                     // Even with all that, we still don't know if the root of the output file structure will be (relative to the package file)
                     // `.`, `./src` or any other deeper directory structure. (If project references are used, it's definitely `.` by fiat, so that should be pretty common.)
@@ -44692,7 +44692,7 @@ var ts;
                         var candidateDirectories = getOutputDirectoriesForBaseDirectory(commonSourceDirGuess);
                         for (var _e = 0, candidateDirectories_1 = candidateDirectories; _e < candidateDirectories_1.length; _e++) {
                             var candidateDir = candidateDirectories_1[_e];
-                            if (ts.startsWith(finalPath, candidateDir)) {
+                            if (ts.containsPath(candidateDir, finalPath, !useCaseSensitiveFileNames())) {
                                 // The matched export is looking up something in either the out declaration or js dir, now map the written path back into the source dir and source extension
                                 var pathFragment = finalPath.slice(candidateDir.length + 1); // +1 to also remove directory seperator
                                 var possibleInputBase = ts.combinePaths(commonSourceDirGuess, pathFragment);
@@ -50974,41 +50974,61 @@ var ts;
             return typeof file.externalModuleIndicator !== "object" && !resolveExportByName(moduleSymbol, ts.escapeLeadingUnderscores("__esModule"), /*sourceNode*/ undefined, dontResolveAlias);
         }
         function getTargetOfImportClause(node, dontResolveAlias) {
-            var _a;
             var moduleSymbol = resolveExternalModuleName(node, node.parent.moduleSpecifier);
             if (moduleSymbol) {
-                var exportDefaultSymbol = void 0;
-                if (ts.isShorthandAmbientModuleSymbol(moduleSymbol)) {
-                    exportDefaultSymbol = moduleSymbol;
-                }
-                else {
-                    exportDefaultSymbol = resolveExportByName(moduleSymbol, "default" /* InternalSymbolName.Default */, node, dontResolveAlias);
-                }
-                var file = (_a = moduleSymbol.declarations) === null || _a === void 0 ? void 0 : _a.find(ts.isSourceFile);
-                var hasDefaultOnly = isOnlyImportedAsDefault(node.parent.moduleSpecifier);
-                var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias, node.parent.moduleSpecifier);
-                if (!exportDefaultSymbol && !hasSyntheticDefault && !hasDefaultOnly) {
-                    if (hasExportAssignmentSymbol(moduleSymbol)) {
-                        var compilerOptionName = moduleKind >= ts.ModuleKind.ES2015 ? "allowSyntheticDefaultImports" : "esModuleInterop";
-                        var exportEqualsSymbol = moduleSymbol.exports.get("export=" /* InternalSymbolName.ExportEquals */);
-                        var exportAssignment = exportEqualsSymbol.valueDeclaration;
-                        var err = error(node.name, ts.Diagnostics.Module_0_can_only_be_default_imported_using_the_1_flag, symbolToString(moduleSymbol), compilerOptionName);
-                        if (exportAssignment) {
-                            ts.addRelatedInfo(err, ts.createDiagnosticForNode(exportAssignment, ts.Diagnostics.This_module_is_declared_with_using_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag, compilerOptionName));
-                        }
-                    }
-                    else {
-                        reportNonDefaultExport(moduleSymbol, node);
+                return getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias);
+            }
+        }
+        function getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias) {
+            var _a;
+            var exportDefaultSymbol;
+            if (ts.isShorthandAmbientModuleSymbol(moduleSymbol)) {
+                exportDefaultSymbol = moduleSymbol;
+            }
+            else {
+                exportDefaultSymbol = resolveExportByName(moduleSymbol, "default" /* InternalSymbolName.Default */, node, dontResolveAlias);
+            }
+            var file = (_a = moduleSymbol.declarations) === null || _a === void 0 ? void 0 : _a.find(ts.isSourceFile);
+            var specifier = getModuleSpecifierForImportOrExport(node);
+            if (!specifier) {
+                return exportDefaultSymbol;
+            }
+            var hasDefaultOnly = isOnlyImportedAsDefault(specifier);
+            var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias, specifier);
+            if (!exportDefaultSymbol && !hasSyntheticDefault && !hasDefaultOnly) {
+                if (hasExportAssignmentSymbol(moduleSymbol)) {
+                    var compilerOptionName = moduleKind >= ts.ModuleKind.ES2015 ? "allowSyntheticDefaultImports" : "esModuleInterop";
+                    var exportEqualsSymbol = moduleSymbol.exports.get("export=" /* InternalSymbolName.ExportEquals */);
+                    var exportAssignment = exportEqualsSymbol.valueDeclaration;
+                    var err = error(node.name, ts.Diagnostics.Module_0_can_only_be_default_imported_using_the_1_flag, symbolToString(moduleSymbol), compilerOptionName);
+                    if (exportAssignment) {
+                        ts.addRelatedInfo(err, ts.createDiagnosticForNode(exportAssignment, ts.Diagnostics.This_module_is_declared_with_export_and_can_only_be_used_with_a_default_import_when_using_the_0_flag, compilerOptionName));
                     }
                 }
-                else if (hasSyntheticDefault || hasDefaultOnly) {
-                    // per emit behavior, a synthetic default overrides a "real" .default member if `__esModule` is not present
-                    var resolved = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
-                    markSymbolOfAliasDeclarationIfTypeOnly(node, moduleSymbol, resolved, /*overwriteTypeOnly*/ false);
-                    return resolved;
+                else if (ts.isImportClause(node)) {
+                    reportNonDefaultExport(moduleSymbol, node);
+                }
+                else {
+                    errorNoModuleMemberSymbol(moduleSymbol, moduleSymbol, node, ts.isImportOrExportSpecifier(node) && node.propertyName || node.name);
                 }
-                markSymbolOfAliasDeclarationIfTypeOnly(node, exportDefaultSymbol, /*finalTarget*/ undefined, /*overwriteTypeOnly*/ false);
-                return exportDefaultSymbol;
+            }
+            else if (hasSyntheticDefault || hasDefaultOnly) {
+                // per emit behavior, a synthetic default overrides a "real" .default member if `__esModule` is not present
+                var resolved = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
+                markSymbolOfAliasDeclarationIfTypeOnly(node, moduleSymbol, resolved, /*overwriteTypeOnly*/ false);
+                return resolved;
+            }
+            markSymbolOfAliasDeclarationIfTypeOnly(node, exportDefaultSymbol, /*finalTarget*/ undefined, /*overwriteTypeOnly*/ false);
+            return exportDefaultSymbol;
+        }
+        function getModuleSpecifierForImportOrExport(node) {
+            switch (node.kind) {
+                case 267 /* SyntaxKind.ImportClause */: return node.parent.moduleSpecifier;
+                case 265 /* SyntaxKind.ImportEqualsDeclaration */: return ts.isExternalModuleReference(node.moduleReference) ? node.moduleReference.expression : undefined;
+                case 268 /* SyntaxKind.NamespaceImport */: return node.parent.parent.moduleSpecifier;
+                case 270 /* SyntaxKind.ImportSpecifier */: return node.parent.parent.parent.moduleSpecifier;
+                case 275 /* SyntaxKind.ExportSpecifier */: return node.parent.parent.moduleSpecifier;
+                default: return ts.Debug.assertNever(node);
             }
         }
         function reportNonDefaultExport(moduleSymbol, node) {
@@ -51098,7 +51118,7 @@ var ts;
             }
         }
         function getExternalModuleMember(node, specifier, dontResolveAlias) {
-            var _a, _b;
+            var _a;
             if (dontResolveAlias === void 0) { dontResolveAlias = false; }
             var moduleSpecifier = ts.getExternalModuleRequireArgument(node) || node.moduleSpecifier;
             var moduleSymbol = resolveExternalModuleName(node, moduleSpecifier); // TODO: GH#18217
@@ -51134,29 +51154,33 @@ var ts;
                         combineValueAndTypeSymbols(symbolFromVariable, symbolFromModule) :
                         symbolFromModule || symbolFromVariable;
                     if (!symbol) {
-                        var moduleName = getFullyQualifiedName(moduleSymbol, node);
-                        var declarationName = ts.declarationNameToString(name);
-                        var suggestion = getSuggestedSymbolForNonexistentModule(name, targetSymbol);
-                        if (suggestion !== undefined) {
-                            var suggestionName = symbolToString(suggestion);
-                            var diagnostic = error(name, ts.Diagnostics._0_has_no_exported_member_named_1_Did_you_mean_2, moduleName, declarationName, suggestionName);
-                            if (suggestion.valueDeclaration) {
-                                ts.addRelatedInfo(diagnostic, ts.createDiagnosticForNode(suggestion.valueDeclaration, ts.Diagnostics._0_is_declared_here, suggestionName));
-                            }
-                        }
-                        else {
-                            if ((_b = moduleSymbol.exports) === null || _b === void 0 ? void 0 : _b.has("default" /* InternalSymbolName.Default */)) {
-                                error(name, ts.Diagnostics.Module_0_has_no_exported_member_1_Did_you_mean_to_use_import_1_from_0_instead, moduleName, declarationName);
-                            }
-                            else {
-                                reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName);
-                            }
-                        }
+                        errorNoModuleMemberSymbol(moduleSymbol, targetSymbol, node, name);
                     }
                     return symbol;
                 }
             }
         }
+        function errorNoModuleMemberSymbol(moduleSymbol, targetSymbol, node, name) {
+            var _a;
+            var moduleName = getFullyQualifiedName(moduleSymbol, node);
+            var declarationName = ts.declarationNameToString(name);
+            var suggestion = getSuggestedSymbolForNonexistentModule(name, targetSymbol);
+            if (suggestion !== undefined) {
+                var suggestionName = symbolToString(suggestion);
+                var diagnostic = error(name, ts.Diagnostics._0_has_no_exported_member_named_1_Did_you_mean_2, moduleName, declarationName, suggestionName);
+                if (suggestion.valueDeclaration) {
+                    ts.addRelatedInfo(diagnostic, ts.createDiagnosticForNode(suggestion.valueDeclaration, ts.Diagnostics._0_is_declared_here, suggestionName));
+                }
+            }
+            else {
+                if ((_a = moduleSymbol.exports) === null || _a === void 0 ? void 0 : _a.has("default" /* InternalSymbolName.Default */)) {
+                    error(name, ts.Diagnostics.Module_0_has_no_exported_member_1_Did_you_mean_to_use_import_1_from_0_instead, moduleName, declarationName);
+                }
+                else {
+                    reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName);
+                }
+            }
+        }
         function reportNonExportedMember(node, name, declarationName, moduleSymbol, moduleName) {
             var _a, _b;
             var localSymbol = (_b = (_a = moduleSymbol.valueDeclaration) === null || _a === void 0 ? void 0 : _a.locals) === null || _b === void 0 ? void 0 : _b.get(name.escapedText);
@@ -51202,6 +51226,13 @@ var ts;
             }
         }
         function getTargetOfImportSpecifier(node, dontResolveAlias) {
+            if (ts.isImportSpecifier(node) && ts.idText(node.propertyName || node.name) === "default" /* InternalSymbolName.Default */) {
+                var specifier = getModuleSpecifierForImportOrExport(node);
+                var moduleSymbol = specifier && resolveExternalModuleName(node, specifier);
+                if (moduleSymbol) {
+                    return getTargetofModuleDefault(moduleSymbol, node, dontResolveAlias);
+                }
+            }
             var root = ts.isBindingElement(node) ? ts.getRootDeclaration(node) : node.parent.parent.parent;
             var commonJSPropertyAccess = getCommonJSPropertyAccess(root);
             var resolved = getExternalModuleMember(root, commonJSPropertyAccess || node, dontResolveAlias);
@@ -51223,6 +51254,13 @@ var ts;
             return resolved;
         }
         function getTargetOfExportSpecifier(node, meaning, dontResolveAlias) {
+            if (ts.idText(node.propertyName || node.name) === "default" /* InternalSymbolName.Default */) {
+                var specifier = getModuleSpecifierForImportOrExport(node);
+                var moduleSymbol = specifier && resolveExternalModuleName(node, specifier);
+                if (moduleSymbol) {
+                    return getTargetofModuleDefault(moduleSymbol, node, !!dontResolveAlias);
+                }
+            }
             var resolved = node.parent.parent.moduleSpecifier ?
                 getExternalModuleMember(node.parent.parent, node, dontResolveAlias) :
                 resolveEntityName(node.propertyName || node.name, meaning, /*ignoreErrors*/ false, dontResolveAlias);
@@ -62173,7 +62211,7 @@ var ts;
                 return includes & 8388608 /* TypeFlags.IncludesWildcard */ ? wildcardType : anyType;
             }
             if (!strictNullChecks && includes & 98304 /* TypeFlags.Nullable */) {
-                return includes & 32768 /* TypeFlags.Undefined */ ? undefinedType : nullType;
+                return includes & 16777216 /* TypeFlags.IncludesEmptyObject */ ? neverType : includes & 32768 /* TypeFlags.Undefined */ ? undefinedType : nullType;
             }
             if (includes & 4 /* TypeFlags.String */ && includes & (128 /* TypeFlags.StringLiteral */ | 134217728 /* TypeFlags.TemplateLiteral */ | 268435456 /* TypeFlags.StringMapping */) ||
                 includes & 8 /* TypeFlags.Number */ && includes & 256 /* TypeFlags.NumberLiteral */ ||
@@ -62863,7 +62901,7 @@ var ts;
             // (T | U)[K] -> T[K] | U[K] (reading)
             // (T | U)[K] -> T[K] & U[K] (writing)
             // (T & U)[K] -> T[K] & U[K]
-            if (objectType.flags & 3145728 /* TypeFlags.UnionOrIntersection */) {
+            if (objectType.flags & 1048576 /* TypeFlags.Union */ || objectType.flags & 2097152 /* TypeFlags.Intersection */ && !shouldDeferIndexType(objectType)) {
                 var types = ts.map(objectType.types, function (t) { return getSimplifiedType(getIndexedAccessType(t, indexType), writing); });
                 return objectType.flags & 2097152 /* TypeFlags.Intersection */ || writing ? getIntersectionType(types) : getUnionType(types);
             }
@@ -65271,7 +65309,7 @@ var ts;
             if (reduced !== type) {
                 return reduced;
             }
-            if (type.flags & 2097152 /* TypeFlags.Intersection */) {
+            if (type.flags & 2097152 /* TypeFlags.Intersection */ && ts.some(type.types, isEmptyAnonymousObjectType)) {
                 var normalizedTypes = ts.sameMap(type.types, function (t) { return getNormalizedType(t, writing); });
                 if (normalizedTypes !== type.types) {
                     return getIntersectionType(normalizedTypes);
@@ -66442,7 +66480,7 @@ var ts;
                                     // create a new chain for the constraint error
                                     resetErrorInfo(saveErrorInfo);
                                 }
-                                if (result = isRelatedTo(source, constraint, 2 /* RecursionFlags.Target */, reportErrors)) {
+                                if (result = isRelatedTo(source, constraint, 2 /* RecursionFlags.Target */, reportErrors, /* headMessage */ undefined, intersectionState)) {
                                     return result;
                                 }
                                 // prefer the shorter chain of the constraint comparison chain, and the direct comparison chain
@@ -66534,8 +66572,8 @@ var ts;
                         var skipTrue = !isTypeAssignableTo(getPermissiveInstantiation(c.checkType), getPermissiveInstantiation(c.extendsType));
                         var skipFalse = !skipTrue && isTypeAssignableTo(getRestrictiveInstantiation(c.checkType), getRestrictiveInstantiation(c.extendsType));
                         // TODO: Find a nice way to include potential conditional type breakdowns in error output, if they seem good (they usually don't)
-                        if (result = skipTrue ? -1 /* Ternary.True */ : isRelatedTo(source, getTrueTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false)) {
-                            result &= skipFalse ? -1 /* Ternary.True */ : isRelatedTo(source, getFalseTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false);
+                        if (result = skipTrue ? -1 /* Ternary.True */ : isRelatedTo(source, getTrueTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false, /*headMessage*/ undefined, intersectionState)) {
+                            result &= skipFalse ? -1 /* Ternary.True */ : isRelatedTo(source, getFalseTypeFromConditionalType(c), 2 /* RecursionFlags.Target */, /*reportErrors*/ false, /*headMessage*/ undefined, intersectionState);
                             if (result) {
                                 return result;
                             }
@@ -71564,7 +71602,7 @@ var ts;
                 var narrowedPropType = narrowType(propType);
                 return filterType(type, function (t) {
                     var discriminantType = getTypeOfPropertyOrIndexSignature(t, propName);
-                    return !(narrowedPropType.flags & 131072 /* TypeFlags.Never */) && isTypeComparableTo(narrowedPropType, discriminantType);
+                    return !(narrowedPropType.flags & 131072 /* TypeFlags.Never */) && areTypesComparable(narrowedPropType, discriminantType);
                 });
             }
             function narrowTypeByDiscriminantProperty(type, access, operator, value, assumeTrue) {
@@ -71613,7 +71651,7 @@ var ts;
             }
             function narrowByInKeyword(type, name, assumeTrue) {
                 if (type.flags & 1048576 /* TypeFlags.Union */
-                    || type.flags & 524288 /* TypeFlags.Object */ && declaredType !== type
+                    || type.flags & 524288 /* TypeFlags.Object */ && declaredType !== type && !(declaredType === unknownType && isEmptyAnonymousObjectType(type))
                     || ts.isThisTypeParameter(type)
                     || type.flags & 2097152 /* TypeFlags.Intersection */ && ts.every(type.types, function (t) { return t.symbol !== globalThisSymbol; })) {
                     return filterType(type, function (t) { return isTypePresencePossible(t, name, assumeTrue); });
@@ -71746,14 +71784,18 @@ var ts;
                     assumeTrue = !assumeTrue;
                 }
                 var valueType = getTypeOfExpression(value);
-                if ((type.flags & 2 /* TypeFlags.Unknown */) && assumeTrue && (operator === 36 /* SyntaxKind.EqualsEqualsEqualsToken */ || operator === 37 /* SyntaxKind.ExclamationEqualsEqualsToken */)) {
+                if (((type.flags & 2 /* TypeFlags.Unknown */) || isEmptyAnonymousObjectType(type) && !(valueType.flags & 98304 /* TypeFlags.Nullable */)) &&
+                    assumeTrue &&
+                    (operator === 36 /* SyntaxKind.EqualsEqualsEqualsToken */ || operator === 37 /* SyntaxKind.ExclamationEqualsEqualsToken */)) {
                     if (valueType.flags & (131068 /* TypeFlags.Primitive */ | 67108864 /* TypeFlags.NonPrimitive */)) {
                         return valueType;
                     }
                     if (valueType.flags & 524288 /* TypeFlags.Object */) {
                         return nonPrimitiveType;
                     }
-                    return type;
+                    if (type.flags & 2 /* TypeFlags.Unknown */) {
+                        return type;
+                    }
                 }
                 if (valueType.flags & 98304 /* TypeFlags.Nullable */) {
                     if (!strictNullChecks) {
@@ -72212,7 +72254,9 @@ var ts;
                 !!(type.flags & 465829888 /* TypeFlags.Instantiable */ && getBaseConstraintOrType(type).flags & (98304 /* TypeFlags.Nullable */ | 1048576 /* TypeFlags.Union */));
         }
         function isGenericTypeWithoutNullableConstraint(type) {
-            return !!(type.flags & 465829888 /* TypeFlags.Instantiable */ && !maybeTypeOfKind(getBaseConstraintOrType(type), 98304 /* TypeFlags.Nullable */));
+            return type.flags & 2097152 /* TypeFlags.Intersection */ ?
+                ts.some(type.types, isGenericTypeWithoutNullableConstraint) :
+                !!(type.flags & 465829888 /* TypeFlags.Instantiable */ && !maybeTypeOfKind(getBaseConstraintOrType(type), 98304 /* TypeFlags.Nullable */));
         }
         function hasContextualTypeWithNoGenericTypes(node, checkMode) {
             // Computing the contextual type for a child of a JSX element involves resolving the type of the
@@ -126909,9 +126953,7 @@ var ts;
                 }
             }
         }
-        var seenRefs = buildInfoPath ? new ts.Set() : undefined;
         var buildInfoCacheEntry = state.buildInfoCache.get(resolvedPath);
-        seenRefs === null || seenRefs === void 0 ? void 0 : seenRefs.add(resolvedPath);
         /** Inputs are up-to-date, just need either timestamp update or bundle prepend manipulation to make it look up-to-date */
         var pseudoUpToDate = false;
         var usesPrepend = false;
@@ -126926,7 +126968,7 @@ var ts;
                     continue;
                 }
                 // Check if tsbuildinfo path is shared, then we need to rebuild
-                if (buildInfoCacheEntry && hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig, resolvedRefPath)) {
+                if (buildInfoCacheEntry && hasSameBuildInfo(state, buildInfoCacheEntry, resolvedRefPath)) {
                     return {
                         type: ts.UpToDateStatusType.OutOfDateWithUpstream,
                         outOfDateOutputFileName: buildInfoPath,
@@ -126984,25 +127026,9 @@ var ts;
             oldestOutputFileName: oldestOutputFileName
         };
     }
-    function hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig, resolvedRefPath) {
-        if (seenRefs.has(resolvedRefPath))
-            return false;
-        seenRefs.add(resolvedRefPath);
+    function hasSameBuildInfo(state, buildInfoCacheEntry, resolvedRefPath) {
         var refBuildInfo = state.buildInfoCache.get(resolvedRefPath);
-        if (refBuildInfo.path === buildInfoCacheEntry.path)
-            return true;
-        if (resolvedConfig.projectReferences) {
-            // Check references
-            for (var _i = 0, _a = resolvedConfig.projectReferences; _i < _a.length; _i++) {
-                var ref = _a[_i];
-                var resolvedRef = ts.resolveProjectReferencePath(ref);
-                var resolvedRefPath_1 = toResolvedConfigFilePath(state, resolvedRef);
-                var resolvedConfig_1 = parseConfigFile(state, resolvedRef, resolvedRefPath_1);
-                if (hasSameBuildInfo(state, buildInfoCacheEntry, seenRefs, resolvedConfig_1, resolvedRefPath_1))
-                    return true;
-            }
-        }
-        return false;
+        return refBuildInfo.path === buildInfoCacheEntry.path;
     }
     function getUpToDateStatus(state, project, resolvedPath) {
         if (project === undefined) {
diff --git a/package-lock.json b/package-lock.json
index 0a3476c8534f2..338dfdda3caf7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -65,7 +65,7 @@
                 "ms": "^2.1.3",
                 "node-fetch": "^2.6.7",
                 "source-map-support": "latest",
-                "typescript": "^4.8.2",
+                "typescript": "^4.8.3",
                 "vinyl": "latest",
                 "which": "^2.0.2",
                 "xml2js": "^0.4.23"
@@ -7960,9 +7960,9 @@
             "dev": true
         },
         "node_modules/typescript": {
-            "version": "4.8.2",
-            "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.8.2.tgz",
-            "integrity": "sha512-C0I1UsrrDHo2fYI5oaCGbSejwX4ch+9Y5jTQELvovfmFkK3HHSZJB8MSJcWLmCUBzQBchCrZ9rMRV6GuNrvGtw==",
+            "version": "4.8.3",
+            "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.8.3.tgz",
+            "integrity": "sha512-goMHfm00nWPa8UvR/CPSvykqf6dVV8x/dp0c5mFTMTIu0u0FlGWRioyy7Nn0PGAdHxpJZnuO/ut+PpQ8UiHAig==",
             "dev": true,
             "bin": {
                 "tsc": "bin/tsc",
@@ -14723,9 +14723,9 @@
             "dev": true
         },
         "typescript": {
-            "version": "4.8.2",
-            "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.8.2.tgz",
-            "integrity": "sha512-C0I1UsrrDHo2fYI5oaCGbSejwX4ch+9Y5jTQELvovfmFkK3HHSZJB8MSJcWLmCUBzQBchCrZ9rMRV6GuNrvGtw==",
+            "version": "4.8.3",
+            "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.8.3.tgz",
+            "integrity": "sha512-goMHfm00nWPa8UvR/CPSvykqf6dVV8x/dp0c5mFTMTIu0u0FlGWRioyy7Nn0PGAdHxpJZnuO/ut+PpQ8UiHAig==",
             "dev": true
         },
         "unbox-primitive": {
diff --git a/package.json b/package.json
index d21e3030d1b01..0d80542b7fab5 100644
--- a/package.json
+++ b/package.json
@@ -91,7 +91,7 @@
         "ms": "^2.1.3",
         "node-fetch": "^2.6.7",
         "source-map-support": "latest",
-        "typescript": "^4.8.2",
+        "typescript": "^4.8.3",
         "vinyl": "latest",
         "which": "^2.0.2",
         "xml2js": "^0.4.23"