Allow Jest to run tests in node_modules

Resolves jestjs#2145 and jestjs#11781. Prevent haste map from automatically discarding
node_modules files.

By default, node_modules is still excluded via the testPathIgnorePatterns
option. However, users can now use that option to allow node_modules
without hacks.

Author: pauldraper

CHANGELOG.md

@@ -27,6 +27,7 @@
 - `[jest-haste-map]` Don't use partial results if file crawl errors ([#12420](https://github.com/facebook/jest/pull/12420))
 - `[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-runtime]` Permit tests in node_modules ([#12438](https://github.com/facebook/jest/pull/12438))
 
 ### Chore & Maintenance
 

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: true,
       rootDir: config.rootDir,
       roots: config.roots,
       throwOnModuleCollision: config.haste.throwOnModuleCollision,