fix: require.main undefined with createRequire()

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 - `[jest-validate]` Show suggestion only when unrecognized cli param is longer than 1 character ([#10604](https://github.com/facebook/jest/pull/10604))
 - `[jest-validate]` Validate `testURL` as CLI option ([#10595](https://github.com/facebook/jest/pull/10595))
+- `[jest-runner, jest-runtime]` fix: `require.main` undefined with createRequire() ([#10610](https://github.com/facebook/jest/pull/10610))
 
 ### Chore & Maintenance
 

packages/jest-runner/src/runTest.ts

@@ -151,7 +151,7 @@ async function runTestInternal(
   const cacheFS = {[path]: testSource};
   setGlobal(environment.global, 'console', testConsole);
 
-  const runtime = new Runtime(config, environment, resolver, cacheFS, {
+  const runtime = new Runtime(config, environment, resolver, cacheFS, path, {
     changedFiles: context?.changedFiles,
     collectCoverage: globalConfig.collectCoverage,
     collectCoverageFrom: globalConfig.collectCoverageFrom,

packages/jest-runtime/src/cli/index.ts

@@ -84,7 +84,13 @@ export async function run(
     setGlobal(environment.global, 'jestProjectConfig', config);
     setGlobal(environment.global, 'jestGlobalConfig', globalConfig);
 
-    const runtime = new Runtime(config, environment, hasteMap.resolver);
+    const runtime = new Runtime(
+      config,
+      environment,
+      hasteMap.resolver,
+      undefined,
+      filePath,
+    );
 
     for (const path of config.setupFiles) {
       // TODO: remove ? in Jest 26

packages/jest-runtime/src/index.ts

@@ -162,6 +162,7 @@ class Runtime {
   private _isolatedModuleRegistry: ModuleRegistry | null;
   private _moduleRegistry: ModuleRegistry;
   private _esmoduleRegistry: Map<string, Promise<VMModule>>;
+  private _path: Config.Path;
   private _resolver: Resolver;
   private _shouldAutoMock: boolean;
   private _shouldMockModuleCache: BooleanMap;
@@ -183,6 +184,7 @@ class Runtime {
     environment: JestEnvironment,
     resolver: Resolver,
     cacheFS: Record<string, string> = {},
+    path: Config.Path,
     coverageOptions?: ShouldInstrumentOptions,
   ) {
     this._cacheFS = new Map(Object.entries(cacheFS));
@@ -208,6 +210,7 @@ class Runtime {
     this._isolatedMockRegistry = null;
     this._moduleRegistry = new Map();
     this._esmoduleRegistry = new Map();
+    this._path = path;
     this._resolver = resolver;
     this._scriptTransformer = new ScriptTransformer(config);
     this._shouldAutoMock = config.automock;
@@ -1363,18 +1366,12 @@ class Runtime {
       });
     })();
 
+    const path = this._path;
+
     Object.defineProperty(moduleRequire, 'main', {
       enumerable: true,
       get() {
-        let mainModule = from.parent;
-        while (
-          mainModule &&
-          mainModule.parent &&
-          mainModule.id !== mainModule.parent.id
-        ) {
-          mainModule = mainModule.parent;
-        }
-        return mainModule;
+        return path;
       },
     });
     return moduleRequire;