Ignore type-only entries in paths (#2075)

internal/bundler/bundler_tsconfig_test.go

@@ -491,6 +491,44 @@ NOTE: You can mark the path "#/test" as external to exclude it from the bundle,
 	})
 }
 
+func TestTsConfigPathsTypeOnly(t *testing.T) {
+	tsconfig_suite.expectBundled(t, bundled{
+		files: map[string]string{
+			"/Users/user/project/entry.ts": `
+				import { fib } from "fib";
+
+				console.log(fib(10));
+			`,
+			"/Users/user/project/node_modules/fib/index.js": `
+				export function fib(input) {
+					if (input < 2) {
+						return input;
+					}
+					return fib(input - 1) + fib(input - 2);
+				}
+			`,
+			"/Users/user/project/fib-local.d.ts": `
+				export function fib(input: number): number;
+			`,
+			"/Users/user/project/tsconfig.json": `
+				{
+					"compilerOptions": {
+						"baseUrl": ".",
+						"paths": {
+							"fib": ["fib-local.d.ts"]
+						}
+					}
+				}
+			`,
+		},
+		entryPaths: []string{"/Users/user/project/entry.ts"},
+		options: config.Options{
+			Mode:          config.ModeBundle,
+			AbsOutputFile: "/Users/user/project/out.js",
+		},
+	})
+}
+
 func TestTsConfigJSX(t *testing.T) {
 	tsconfig_suite.expectBundled(t, bundled{
 		files: map[string]string{

internal/bundler/snapshots/snapshots_tsconfig.txt

@@ -198,6 +198,20 @@ var test_default = 123;
 // Users/user/project/src/entry.ts
 console.log(test_default);
 
+================================================================================
+TestTsConfigPathsTypeOnly
+---------- /Users/user/project/out.js ----------
+// Users/user/project/node_modules/fib/index.js
+function fib(input) {
+  if (input < 2) {
+    return input;
+  }
+  return fib(input - 1) + fib(input - 2);
+}
+
+// Users/user/project/entry.ts
+console.log(fib(10));
+
 ================================================================================
 TestTsconfigImportsNotUsedAsValuesPreserve
 ---------- /Users/user/project/out.js ----------

internal/resolver/resolver.go

@@ -1486,6 +1486,10 @@ func (r resolverQuery) matchTSConfigPaths(tsConfigJSON *TSConfigJSON, path strin
 				r.debugLogs.addNote(fmt.Sprintf("Found an exact match for %q in \"paths\"", key))
 			}
 			for _, originalPath := range originalPaths {
+				if strings.HasSuffix(originalPath, ".d.ts") || strings.HasSuffix(strings.ToLower(originalPath), ".d.ts") {
+					continue
+				}
+
 				// Load the original path relative to the "baseUrl" from tsconfig.json
 				absoluteOriginalPath := originalPath
 				if !r.fs.IsAbs(originalPath) {
@@ -1543,6 +1547,10 @@ func (r resolverQuery) matchTSConfigPaths(tsConfigJSON *TSConfigJSON, path strin
 			matchedText := path[len(longestMatch.prefix) : len(path)-len(longestMatch.suffix)]
 			originalPath = strings.Replace(originalPath, "*", matchedText, 1)
 
+			if strings.HasSuffix(originalPath, ".d.ts") || strings.HasSuffix(strings.ToLower(originalPath), ".d.ts") {
+				continue
+			}
+
 			// Load the original path relative to the "baseUrl" from tsconfig.json
 			absoluteOriginalPath := originalPath
 			if !r.fs.IsAbs(originalPath) {