fix: Allow searching for tests in node_modules

CHANGELOG.md

@@ -29,6 +29,7 @@
 - `[jest-jasmine2, jest-types]` [**BREAKING**] Move all `jasmine` specific types from `@jest/types` to its own package ([#12125](https://github.com/facebook/jest/pull/12125))
 - `[jest-matcher-utils]` Pass maxWidth to `pretty-format` to avoid printing every element in arrays by default ([#12402](https://github.com/facebook/jest/pull/12402))
 - `[jest-mock]` Fix function overloads for `spyOn` to allow more correct type inference in complex object ([#12442](https://github.com/facebook/jest/pull/12442))
+- `[jest-config]` Allow searching for tests in node_modules by exposing `retainAllFiles` ([#11084](https://github.com/facebook/jest/pull/11084))
 
 ### Chore & Maintenance
 

docs/Configuration.md

@@ -511,6 +511,8 @@ type HasteConfig = {
   throwOnModuleCollision?: boolean;
   /** Custom HasteMap module */
   hasteMapModulePath?: string;
+  // Whether to retain all files, allowing e.g. search for tests in `node_modules`.
+  retainAllFiles?: boolean;
 };
 ```
 

e2e/__tests__/retainAllFiles.test.ts

@@ -0,0 +1,25 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import runJest from '../runJest';
+
+describe('Retain All Files Integration', () => {
+  test('valid test within node_modules', () => {
+    const config = {
+      haste: {
+        retainAllFiles: true,
+      },
+    };
+
+    const {exitCode} = runJest('retain-all-files', [
+      '--config',
+      JSON.stringify(config),
+      'retainAllFiles.test.js',
+    ]);
+    expect(exitCode).toBe(0);
+  });
+});

e2e/retain-all-files/package.json

@@ -0,0 +1,9 @@
+{
+  "jest": {
+    "testEnvironment": "node",
+    "testPathIgnorePatterns": [],
+    "haste": {
+      "retainAllFiles": true
+    }
+  }
+}

packages/jest-config/src/ValidConfig.ts

@@ -64,6 +64,7 @@ const initialOptions: Config.InitialOptions = {
     hasteImplModulePath: '<rootDir>/haste_impl.js',
     hasteMapModulePath: '',
     platforms: ['ios', 'android'],
+    retainAllFiles: false,
     throwOnModuleCollision: false,
   },
   injectGlobals: true,

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

@@ -57,6 +57,7 @@ export type WorkerMessage = {
   rootDir: string;
   filePath: string;
   hasteImplModulePath?: string;
+  retainAllFiles?: boolean;
 };
 
 export type WorkerMetadata = {

packages/jest-runtime/src/index.ts

@@ -386,7 +386,7 @@ export default class Runtime {
       name: config.name,
       platforms: config.haste.platforms || ['ios', 'android'],
       resetCache: options?.resetCache,
-      retainAllFiles: false,
+      retainAllFiles: config.haste.retainAllFiles || false,
       rootDir: config.rootDir,
       roots: config.roots,
       throwOnModuleCollision: config.haste.throwOnModuleCollision,

packages/jest-types/src/Config.ts

@@ -35,6 +35,8 @@ export type HasteConfig = {
   throwOnModuleCollision?: boolean;
   /** Custom HasteMap module */
   hasteMapModulePath?: string;
+  /** Whether to retain all files, allowing e.g. search for tests in `node_modules`. */
+  retainAllFiles?: boolean;
 };
 
 export type CoverageReporterName = keyof ReportOptions;