Move Jest config from package.json to jest.config.js.

Author: mstange

jest.config.js

@@ -0,0 +1,43 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+module.exports = {
+  testMatch: ['<rootDir>/src/**/*.test.{js,jsx,ts,tsx}'],
+  moduleFileExtensions: ['js', 'jsx', 'ts', 'tsx'],
+
+  testEnvironment: './src/test/custom-environment',
+  setupFilesAfterEnv: [
+    'jest-extended/all',
+    './src/test/setup.ts',
+  ],
+
+  collectCoverageFrom: [
+    'src/**/*.{js,jsx,ts,tsx}',
+    '!**/node_modules/**',
+    '!src/types/libdef/**',
+  ],
+
+  // Transform ESM modules to CommonJS for Jest
+  // These packages ship as pure ESM and need to be transformed by Babel
+  transformIgnorePatterns: [
+    '/node_modules/(?!(query-string|decode-uri-component|iongraph-web|split-on-first|filter-obj|fetch-mock)/)',
+  ],
+
+  // Mock static assets (images, CSS, etc.)
+  moduleNameMapper: {
+    '\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga|ftl)$':
+      '<rootDir>/src/test/fixtures/mocks/file-mock.ts',
+    '\\.(css|less)$': '<rootDir>/src/test/fixtures/mocks/style-mock.ts',
+  },
+
+  globals: {
+    AVAILABLE_STAGING_LOCALES: null,
+  },
+
+  snapshotFormat: {
+    escapeString: true,
+    printBasicPrototype: true,
+  },
+  verbose: false,
+};

package.json

@@ -194,39 +194,6 @@
     "@types/react-splitter-layout/@types/react": "^18.3.26",
     "@types/trusted-types": "^2.0.7"
   },
-  "jest": {
-    "collectCoverageFrom": [
-      "src/**/*.{js,jsx,ts,tsx}",
-      "!**/node_modules/**",
-      "!src/types/libdef/**"
-    ],
-    "moduleFileExtensions": [
-      "js",
-      "jsx",
-      "ts",
-      "tsx"
-    ],
-    "transformIgnorePatterns": [
-      "/node_modules/(?!(query-string|decode-uri-component|iongraph-web|split-on-first|filter-obj|fetch-mock)/)"
-    ],
-    "moduleNameMapper": {
-      "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga|ftl)$": "<rootDir>/src/test/fixtures/mocks/file-mock.ts",
-      "\\.(css|less)$": "<rootDir>/src/test/fixtures/mocks/style-mock.ts"
-    },
-    "setupFilesAfterEnv": [
-      "jest-extended/all",
-      "./src/test/setup.ts"
-    ],
-    "globals": {
-      "AVAILABLE_STAGING_LOCALES": null
-    },
-    "snapshotFormat": {
-      "escapeString": true,
-      "printBasicPrototype": true
-    },
-    "testEnvironment": "./src/test/custom-environment",
-    "verbose": false
-  },
   "husky": {
     "hooks": {
       "post-checkout": "node bin/post-checkout.js",