fix(jest-haste-map): Fix clobbering/errors when multiple configs use different haste impls (#15522)

Author: robhogan

CHANGELOG.md

@@ -82,6 +82,7 @@
 - `[@jest/expect-utils]` Check `Symbol` properties in equality ([#14688](https://github.com/jestjs/jest/pull/14688))
 - `[@jest/expect-utils]` Catch circular references within arrays when matching objects ([#14894](https://github.com/jestjs/jest/pull/14894))
 - `[@jest/expect-utils]` Fix not addressing to Sets and Maps as objects without keys ([#14873](https://github.com/jestjs/jest/pull/14873))
+- `[jest-haste-map]` Fix errors or clobbering with multiple `hasteImplModulePath`s ([#15522](https://github.com/jestjs/jest/pull/15522))
 - `[jest-leak-detector]` Make leak-detector more aggressive when running GC ([#14526](https://github.com/jestjs/jest/pull/14526))
 - `[jest-runtime]` Properly handle re-exported native modules in ESM via CJS ([#14589](https://github.com/jestjs/jest/pull/14589))
 - `[jest-runtime]` Refactor `_importCoreModel` so required core module is consistent if modified while loading ([#15077](https://github.com/jestjs/jest/issues/15077))

packages/jest-haste-map/src/worker.ts

@@ -21,24 +21,14 @@ import type {
 
 const PACKAGE_JSON = `${path.sep}package.json`;
 
-let hasteImpl: HasteImpl | null = null;
-let hasteImplModulePath: string | null = null;
-
 function sha1hex(content: string | Buffer): string {
   return createHash('sha1').update(content).digest('hex');
 }
 
 export async function worker(data: WorkerMessage): Promise<WorkerMetadata> {
-  if (
-    data.hasteImplModulePath &&
-    data.hasteImplModulePath !== hasteImplModulePath
-  ) {
-    if (hasteImpl) {
-      throw new Error('jest-haste-map: hasteImplModulePath changed');
-    }
-    hasteImplModulePath = data.hasteImplModulePath;
-    hasteImpl = require(hasteImplModulePath);
-  }
+  const hasteImpl: HasteImpl | null = data.hasteImplModulePath
+    ? require(data.hasteImplModulePath)
+    : null;
 
   let content: string | undefined;
   let dependencies: WorkerMetadata['dependencies'];