Fix Go To Source Definition in --moduleResolution bundler

src/compiler/binder.ts

@@ -85,7 +85,6 @@ import {
     getContainingClass,
     getEffectiveContainerForJSDocTemplateTag,
     getElementOrPropertyAccessName,
-    getEmitModuleResolutionKind,
     getEmitScriptTarget,
     getEnclosingBlockScopeContainer,
     getErrorSpanForNode,
@@ -242,7 +241,6 @@ import {
     ModifierFlags,
     ModuleBlock,
     ModuleDeclaration,
-    ModuleResolutionKind,
     Mutable,
     NamespaceExportDeclaration,
     Node,
@@ -279,6 +277,7 @@ import {
     setValueDeclaration,
     ShorthandPropertyAssignment,
     shouldPreserveConstEnums,
+    shouldResolveJsRequire,
     SignatureDeclaration,
     skipParentheses,
     sliceAfter,
@@ -3525,7 +3524,7 @@ function createBinder(): (file: SourceFile, options: CompilerOptions) => void {
         if (!isBindingPattern(node.name)) {
             const possibleVariableDecl = node.kind === SyntaxKind.VariableDeclaration ? node : node.parent.parent;
             if (isInJSFile(node) &&
-                getEmitModuleResolutionKind(options) !== ModuleResolutionKind.Bundler &&
+                shouldResolveJsRequire(options) &&
                 isVariableDeclarationInitializedToBareOrAccessedRequire(possibleVariableDecl) &&
                 !getJSDocTypeTag(node) &&
                 !(getCombinedModifierFlags(node) & ModifierFlags.Export)

src/compiler/checker.ts

@@ -940,6 +940,7 @@ import {
     ShorthandPropertyAssignment,
     shouldAllowImportingTsExtension,
     shouldPreserveConstEnums,
+    shouldResolveJsRequire,
     Signature,
     SignatureDeclaration,
     SignatureFlags,
@@ -4006,7 +4007,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
         const hasDefaultOnly = isOnlyImportedAsDefault(specifier);
         const hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias, specifier);
         if (!exportDefaultSymbol && !hasSyntheticDefault && !hasDefaultOnly) {
-            if (hasExportAssignmentSymbol(moduleSymbol) && !(getAllowSyntheticDefaultImports(compilerOptions) || getESModuleInterop(compilerOptions))) {
+            if (hasExportAssignmentSymbol(moduleSymbol) && !allowSyntheticDefaultImports) {
                 const compilerOptionName = moduleKind >= ModuleKind.ES2015 ? "allowSyntheticDefaultImports" : "esModuleInterop";
                 const exportEqualsSymbol = moduleSymbol.exports!.get(InternalSymbolName.ExportEquals);
                 const exportAssignment = exportEqualsSymbol!.valueDeclaration;
@@ -4149,7 +4150,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
         if (!isIdentifier(name)) {
             return undefined;
         }
-        const suppressInteropError = name.escapedText === InternalSymbolName.Default && !!(compilerOptions.allowSyntheticDefaultImports || getESModuleInterop(compilerOptions));
+        const suppressInteropError = name.escapedText === InternalSymbolName.Default && allowSyntheticDefaultImports;
         const targetSymbol = resolveESModuleSymbol(moduleSymbol, moduleSpecifier, /*dontResolveAlias*/ false, suppressInteropError);
         if (targetSymbol) {
             if (name.escapedText) {
@@ -9204,7 +9205,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                 // If `target` refers to a shorthand module symbol, the name we're trying to pull out isn;t recoverable from the target symbol
                 // In such a scenario, we must fall back to looking for an alias declaration on `symbol` and pulling the target name from that
                 let verbatimTargetName = isShorthandAmbientModuleSymbol(target) && getSomeTargetNameFromDeclarations(symbol.declarations) || unescapeLeadingUnderscores(target.escapedName);
-                if (verbatimTargetName === InternalSymbolName.ExportEquals && (getESModuleInterop(compilerOptions) || compilerOptions.allowSyntheticDefaultImports)) {
+                if (verbatimTargetName === InternalSymbolName.ExportEquals && allowSyntheticDefaultImports) {
                     // target refers to an `export=` symbol that was hoisted into a synthetic default - rename here to match
                     verbatimTargetName = InternalSymbolName.Default;
                 }
@@ -34163,7 +34164,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
         }
 
         // In JavaScript files, calls to any identifier 'require' are treated as external module imports
-        if (isInJSFile(node) && getEmitModuleResolutionKind(compilerOptions) !== ModuleResolutionKind.Bundler && isCommonJsRequire(node)) {
+        if (isInJSFile(node) && shouldResolveJsRequire(compilerOptions) && isCommonJsRequire(node)) {
             return resolveExternalModuleTypeByLiteral(node.arguments![0] as StringLiteral);
         }
 

src/compiler/program.ts

@@ -287,6 +287,7 @@ import {
     setParentRecursive,
     setResolvedModule,
     setResolvedTypeReferenceDirective,
+    shouldResolveJsRequire,
     skipTrivia,
     skipTypeChecking,
     some,
@@ -3211,8 +3212,7 @@ export function createProgram(rootNamesOrOptions: readonly string[] | CreateProg
             collectModuleReferences(node, /*inAmbientModule*/ false);
         }
 
-        // `require` has no special meaning in `--moduleResolution bundler`
-        const shouldProcessRequires = isJavaScriptFile && getEmitModuleResolutionKind(options) !== ModuleResolutionKind.Bundler;
+        const shouldProcessRequires = isJavaScriptFile && shouldResolveJsRequire(options);
         if ((file.flags & NodeFlags.PossiblyContainsDynamicImport) || shouldProcessRequires) {
             collectDynamicImportOrRequireCalls(file);
         }

src/compiler/utilities.ts

@@ -8438,6 +8438,12 @@ export function moduleResolutionSupportsPackageJsonExportsAndImports(moduleResol
         || moduleResolution === ModuleResolutionKind.Bundler;
 }
 
+/** @internal */
+export function shouldResolveJsRequire(compilerOptions: CompilerOptions): boolean {
+    // `bundler` doesn't support resolving `require`, but needs to in `noDtsResolution` to support Find Source Definition
+    return !!compilerOptions.noDtsResolution || getEmitModuleResolutionKind(compilerOptions) !== ModuleResolutionKind.Bundler;
+}
+
 /** @internal */
 export function getResolvePackageJsonExports(compilerOptions: CompilerOptions) {
     const moduleResolution = getEmitModuleResolutionKind(compilerOptions);

tests/baselines/reference/goToSource15_bundler.baseline.jsonc

@@ -0,0 +1,34 @@
+// === goToSourceDefinition ===
+// === /node_modules/react/cjs/react.production.min.js ===
+// 'use strict';exports.[|{| defId: 0 |}useState|]=function(a){};exports.version='16.8.6';
+
+// === /node_modules/react/cjs/react.development.js ===
+// 'use strict';
+// if (process.env.NODE_ENV !== 'production') {
+//   (function() {
+//     function useState(initialState) {}
+//     exports.[|{| defId: 1 |}useState|] = useState;
+//     exports.version = '16.8.6';
+//   }());
+// }
+
+// === /index.ts ===
+// import { /*GOTO SOURCE DEF*/useState } from 'react';
+
+  // === Details ===
+  [
+   {
+    "defId": 0,
+    "containerKind": "",
+    "containerName": "",
+    "kind": "",
+    "name": ""
+   },
+   {
+    "defId": 1,
+    "containerKind": "",
+    "containerName": "",
+    "kind": "",
+    "name": ""
+   }
+  ]

tests/cases/fourslash/server/goToSource15_bundler.ts

@@ -0,0 +1,34 @@
+/// <reference path="../fourslash.ts" />
+
+// @Filename: /tsconfig.json
+//// { "compilerOptions": { "module": "esnext", "moduleResolution": "bundler" } }
+
+// @Filename: /node_modules/react/package.json
+//// { "name": "react", "version": "16.8.6", "main": "index.js" }
+
+// @Filename: /node_modules/react/index.js
+//// 'use strict';
+//// 
+//// if (process.env.NODE_ENV === 'production') {
+////   module.exports = require('./cjs/react.production.min.js');
+//// } else {
+////   module.exports = require('./cjs/react.development.js');
+//// }
+
+// @Filename: /node_modules/react/cjs/react.production.min.js
+//// 'use strict';exports./*production*/useState=function(a){};exports.version='16.8.6';
+
+// @Filename: /node_modules/react/cjs/react.development.js
+//// 'use strict';
+//// if (process.env.NODE_ENV !== 'production') {
+////   (function() {
+////     function useState(initialState) {}
+////     exports./*development*/useState = useState;
+////     exports.version = '16.8.6';
+////   }());
+//// }
+
+// @Filename: /index.ts
+//// import { [|/*start*/useState|] } from 'react';
+
+verify.baselineGoToSourceDefinition("start");