fix(jest-config): support custom reporters in legacy module path $HOME/.node_libraries

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Fixes
 
 - `[jest-runtime]` Fix issue where user cannot utilize dynamic import despite specifying `--experimental-vm-modules` Node option ([#15842](https://github.com/jestjs/jest/pull/15842))
+- `[jest-config]` Fix issue where custom reporters not loaded from legacy global module folder, i.e. `$HOME/.node_libraries` ([#15852](https://github.com/jestjs/jest/pull/15852))
 
 ## 30.2.0
 

e2e/__tests__/customReporters.test.ts

@@ -179,4 +179,36 @@ describe('Custom Reporters Integration', () => {
     expect(stderr).toMatch(/ON_RUN_START_ERROR/);
     expect(exitCode).toBe(1);
   });
+
+  test('supports custom reporter stored in legacy module path, i.e. $HOME/.node_libraries', () => {
+    writeFiles(DIR, {
+      '__tests__/test.test.js': "test('test', () => {});",
+      'fakeHome/.node_libraries/@org/custom-reporter/index.js': `
+        'use strict';
+        module.exports = class Reporter {
+          onRunStart() {
+            throw new Error('ON_RUN_START_ERROR');
+          }
+        };
+      `,
+      'package.json': JSON.stringify({
+        jest: {
+          reporters: ['@org/custom-reporter'],
+        },
+      }),
+    });
+
+    const {stderr, exitCode} = runJest(DIR, undefined, {
+      env: {
+        HOME: path.resolve(DIR, 'fakeHome'),
+        // For Windows testing
+        USERPROFILE:
+          process.platform === 'win32'
+            ? path.resolve(DIR, 'fakeHome')
+            : undefined,
+      },
+    });
+    expect(stderr).toMatch(/ON_RUN_START_ERROR/);
+    expect(exitCode).toBe(1);
+  });
 });

packages/jest-config/src/normalize.ts

@@ -26,6 +26,7 @@ import {
   clearLine,
   replacePathSepForGlob,
   requireOrImportModule,
+  specialChars,
   tryRealpath,
 } from 'jest-util';
 import {ValidationError, validate} from 'jest-validate';
@@ -169,7 +170,9 @@ const setupPreset = async (
           );
         }
         throw createConfigError(
-          `  Preset ${chalk.bold(presetPath)} not found relative to rootDir ${chalk.bold(options.rootDir)}.`,
+          `  Preset ${chalk.bold(
+            presetPath,
+          )} not found relative to rootDir ${chalk.bold(options.rootDir)}.`,
         );
       }
       throw createConfigError(
@@ -378,8 +381,17 @@ const normalizeReporters = ({
     );
 
     if (!['default', 'github-actions', 'summary'].includes(reporterPath)) {
+      // There's a chance that users store custom reporter in legacy module paths
+      // such as $HOME/.node_libraries
+      const homeDir = specialChars.isWindows
+        ? process.env.USERPROFILE
+        : process.env.HOME;
+      const legacyModulePaths = homeDir
+        ? [path.resolve(homeDir, '.node_libraries')]
+        : undefined;
       const reporter = Resolver.findNodeModule(reporterPath, {
         basedir: rootDir,
+        paths: legacyModulePaths,
       });
       if (!reporter) {
         throw new Resolver.ModuleNotFoundError(

packages/jest-util/src/specialChars.ts

@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-const isWindows = process.platform === 'win32';
+export const isWindows = process.platform === 'win32';
 
 export const ARROW = ' \u203A ';
 export const ICONS = {