fix(49546): create computed property name for symbol props (#49554)

src/services/codefixes/fixAddMissingMember.ts

@@ -485,7 +485,7 @@ namespace ts.codefix {
         const checker = context.program.getTypeChecker();
         const props = map(info.properties, prop => {
             const initializer = tryGetValueFromType(context, checker, importAdder, quotePreference, checker.getTypeOfSymbol(prop), info.parentDeclaration);
-            return factory.createPropertyAssignment(createPropertyNameNodeForIdentifierOrLiteral(prop.name, target, quotePreference === QuotePreference.Single), initializer);
+            return factory.createPropertyAssignment(createPropertyNameFromSymbol(prop, target, quotePreference, checker), initializer);
         });
         const options = {
             leadingTriviaOption: textChanges.LeadingTriviaOption.Exclude,
@@ -608,4 +608,14 @@ namespace ts.codefix {
         const declaration = findAncestor(callExpression, n => isMethodDeclaration(n) || isConstructorDeclaration(n));
         return declaration && declaration.parent === node ? declaration : undefined;
     }
+
+    function createPropertyNameFromSymbol(symbol: Symbol, target: ScriptTarget, quotePreference: QuotePreference, checker: TypeChecker) {
+        if (isTransientSymbol(symbol) && symbol.nameType && symbol.nameType.flags & TypeFlags.UniqueESSymbol) {
+            const expression = checker.symbolToExpression((symbol.nameType as UniqueESSymbolType).symbol, SymbolFlags.Value, symbol.valueDeclaration, NodeBuilderFlags.AllowUniqueESSymbolType);
+            if (expression) {
+                return factory.createComputedPropertyName(expression);
+            }
+        }
+        return createPropertyNameNodeForIdentifierOrLiteral(symbol.name, target, quotePreference === QuotePreference.Single);
+    }
 }

tests/cases/fourslash/codeFixAddMissingProperties22.ts

@@ -0,0 +1,15 @@
+/// <reference path="fourslash.ts" />
+
+// @lib: es2020
+////const x: Iterable<number> = {}
+
+verify.codeFix({
+    index: 0,
+    description: ts.Diagnostics.Add_missing_properties.message,
+    newFileContent:
+`const x: Iterable<number> = {
+    [Symbol.iterator]: function(): Iterator<number, any, undefined> {
+        throw new Error("Function not implemented.");
+    }
+}`,
+});