Bug 1881701 - Change new .eslintrc.mjs files to modules (misc), and export as flat config. r=frontend-codestyle-reviewers,webdriver-reviewers,perftest-reviewers,geckoview-reviewers,devtools-reviewers,sync-reviewers,android-reviewers,mossop,spidermonkey-reviewers,Gijs,ohall,whimboo,nchevobbe,arai,sparky,skhamis,webcompat-reviewers,twisniewski

Differential Revision: https://phabricator.services.mozilla.com/D249951

accessible/tests/browser/.eslintrc.mjs

@@ -1,6 +1,9 @@
-"use strict";
+/* 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 = {
+export default [
+  {
     rules: {
       "mozilla/no-aArgs": "error",
       "mozilla/reject-importGlobalProperties": ["error", "everything"],
@@ -24,4 +27,5 @@ module.exports = {
       yoda: "error",
       "no-undef-init": "error",
     },
-};
+  },
+];

accessible/tests/mochitest/.eslintrc.mjs

@@ -1,14 +1,16 @@
-"use strict";
+/* 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 = {
+export default [
+  {
     rules: {
       // XXX These are rules that are enabled in the recommended configuration, but
       // disabled here due to failures when initially implemented. They should be
       // removed (and hence enabled) at some stage.
       "no-nested-ternary": "off",
     },
-
+  },
-  overrides: [
   {
     files: [
       // Bug 1602061 TODO: These tests access DOM elements via
@@ -20,5 +22,4 @@ module.exports = {
       "no-undef": "off",
     },
   },
-  ],
+];
-};

dom/base/test/jsmodules/.eslintrc.mjs

@@ -1,15 +1,15 @@
-"use strict";
+/* 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 = {
+export default [
-  overrides: [
   {
     // eslint-plugin-html doesn't automatically detect module sections in
     // html files. Enable these as a module here. JavaScript files can use
     // the mjs extension.
-      files: ["*.html"],
+    files: ["**/*.html"],
-      parserOptions: {
+    languageOptions: {
       sourceType: "module",
     },
   },
-  ],
+];
-};

dom/fs/test/common/.eslintrc.mjs

@@ -2,13 +2,15 @@
  * 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/. */
 
-"use strict";
+export default [
-
+  {
-module.exports = {
+    languageOptions: {
       globals: {
         Assert: true,
         exported_symbols: true,
         require_module: true,
         Utils: true,
       },
-};
+    },
+  },
+];

dom/fs/test/mochitest/worker/.eslintrc.mjs

@@ -3,10 +3,12 @@
  * http://creativecommons.org/publicdomain/zero/1.0/
  */
 
-"use strict";
+import globals from "globals";
 
-module.exports = {
+export default [
-  env: {
+  {
-    worker: true,
+    languageOptions: {
+      globals: globals.worker,
     },
-};
+  },
+];

dom/fs/test/xpcshell/worker/.eslintrc.mjs

@@ -3,10 +3,12 @@
  * http://creativecommons.org/publicdomain/zero/1.0/
  */
 
-"use strict";
+import globals from "globals";
 
-module.exports = {
+export default [
-  env: {
+  {
-    worker: true,
+    languageOptions: {
+      globals: globals.worker,
     },
-};
+  },
+];

dom/media/mediasource/test/.eslintrc.mjs

@@ -1,8 +1,12 @@
-"use strict";
+/* 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 = {
+export default [
+  {
     // Globals from mediasource.js. We use false to indicate they should not
     // be overwritten in scripts.
+    languageOptions: {
       globals: {
         addMSEPrefs: false,
         fetchAndLoad: false,
@@ -20,9 +24,11 @@ module.exports = {
         wait: false,
         waitUntilTime: false,
       },
+    },
     // Use const/let instead of var for tighter scoping, avoiding redeclaration
     rules: {
       "no-var": "error",
       "prefer-const": "error",
     },
-};
+  },
+];

dom/quota/test/modules/system/worker/.eslintrc.mjs

@@ -3,19 +3,12 @@
  * http://creativecommons.org/publicdomain/zero/1.0/
  */
 
-"use strict";
+import globals from "globals";
 
-module.exports = {
+export default [
-  env: {
-    worker: true,
-  },
-
-  overrides: [
   {
-      files: ["head.js"],
+    languageOptions: {
-      env: {
+      globals: globals.worker,
-        worker: true,
     },
   },
-  ],
+];
-};

js/src/builtin/.eslintrc.mjs

@@ -2,48 +2,15 @@
  * 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/. */
 
-"use strict";
+import spidermonkeyJS from "eslint-plugin-spidermonkey-js";
+import mozilla from "eslint-plugin-mozilla";
+import globals from "globals";
 
-module.exports = {
+export default [
-  plugins: ["spidermonkey-js"],
-
-  overrides: [
   {
-      files: ["*.js"],
+    plugins: { "spidermonkey-js": spidermonkeyJS },
-      excludedFiles: ".eslintrc.js",
+    files: ["**/*.js"],
     processor: "spidermonkey-js/processor",
-      env: {
-        // Disable all built-in environments.
-        node: false,
-        browser: false,
-        builtin: false,
-
-        // We need to explicitly disable the default environments added from
-        // "tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js".
-        es2021: false,
-        "mozilla/privileged": false,
-        "mozilla/specific": false,
-
-        // Enable SpiderMonkey's self-hosted environment.
-        "spidermonkey-js/environment": true,
-      },
-
-      parserOptions: {
-        ecmaVersion: "latest",
-        sourceType: "script",
-
-        // Self-hosted code defaults to strict mode.
-        ecmaFeatures: {
-          impliedStrict: true,
-        },
-
-        // Strict mode has to be enabled separately for the Babel parser.
-        babelOptions: {
-          parserOpts: {
-            strictMode: true,
-          },
-        },
-      },
 
     rules: {
       // We should fix those at some point, but we use this to detect NaNs.
@@ -114,11 +81,13 @@ module.exports = {
         },
         {
           selector: "VariableDeclaration[kind='let']",
-            message: "'let' declarations are disallowed to avoid TDZ checks, use 'var' instead",
+          message:
+            "'let' declarations are disallowed to avoid TDZ checks, use 'var' instead",
         },
         {
           selector: "VariableDeclaration[kind='const']",
-            message: "'const' declarations are disallowed to avoid TDZ checks, use 'var' instead",
+          message:
+            "'const' declarations are disallowed to avoid TDZ checks, use 'var' instead",
         },
       ],
       // Method signatures are important in builtins so disable unused argument errors.
@@ -131,7 +100,39 @@ module.exports = {
       ],
     },
 
+    languageOptions: {
+      parserOptions: {
+        ecmaVersion: "latest",
+
+        // Self-hosted code defaults to strict mode.
+        ecmaFeatures: {
+          impliedStrict: true,
+        },
+
+        // Strict mode has to be enabled separately for the Babel parser.
+        babelOptions: {
+          parserOpts: {
+            strictMode: true,
+          },
+        },
+      },
+
+      sourceType: "script",
       globals: {
+        // Disable all built-in environments.
+        ...mozilla.turnOff(globals.node),
+        ...mozilla.turnOff(globals.browser),
+        ...mozilla.turnOff(globals.builtin),
+
+        // We need to explicitly disable the default environments added from
+        // "tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js".
+        ...mozilla.turnOff(globals.es2021),
+        ...mozilla.turnOff(mozilla.environments.privileged.globals),
+        ...mozilla.turnOff(mozilla.environments.specific.globals),
+
+        // Enable SpiderMonkey's self-hosted environment.
+        ...spidermonkeyJS.environments.environment.globals,
+
         // The bytecode compiler special-cases these identifiers.
         ArgumentsLength: "readonly",
         allowContentIter: "readonly",
@@ -173,5 +174,5 @@ module.exports = {
         Tuple: "off",
       },
     },
-  ],
+  },
-};
+];

mobile/android/.eslintrc.mjs

@@ -2,19 +2,15 @@
  * 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/. */
 
-"use strict";
+import config from "../../toolkit/components/extensions/parent/.eslintrc.mjs";
 
-const {
+export default [
-  globals,
-} = require("../../toolkit/components/extensions/parent/.eslintrc.js");
-
-module.exports = {
-  overrides: [
   {
     files: ["components/extensions/ext-*.js"],
-      excludedFiles: ["components/extensions/ext-c-*.js"],
+    ignores: ["components/extensions/ext-c-*.js"],
+    languageOptions: {
       globals: {
-        ...globals,
+        ...config[0].globals,
         // These globals are defined in ext-android.js and can only be used in
         // the extension files that run in the parent process.
         EventDispatcher: true,
@@ -25,6 +21,7 @@ module.exports = {
         windowTracker: true,
       },
     },
+  },
   {
     files: [
       "chrome/geckoview/**",
@@ -69,5 +66,4 @@ module.exports = {
       ],
     },
   },
-  ],
+];
-};

mobile/android/android-components/components/feature/webcompat-reporter/src/main/assets/extensions/webcompat-reporter/.eslintrc.mjs

@@ -2,9 +2,12 @@
  * 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/. */
 
-"use strict";
+import mozilla from "eslint-plugin-mozilla";
+
+export default [
+  {
+    plugins: { mozilla },
 
-module.exports = {
     rules: {
       // Rules from the mozilla plugin
       "mozilla/balanced-listeners": "error",
@@ -73,4 +76,5 @@ module.exports = {
       // Disallow function or variable declarations in nested blocks
       "no-inner-declarations": "error",
     },
-};
+  },
+];

mobile/android/examples/messaging_example/app/src/main/assets/messaging/.eslintrc.mjs

@@ -2,10 +2,12 @@
  * 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/. */
 
-"use strict";
+import globals from "globals";
 
-module.exports = {
+export default [
-  env: {
+  {
-    webextensions: true,
+    languageOptions: {
+      globals: globals.webextensions,
     },
-};
+  },
+];

mobile/android/examples/port_messaging_example/app/src/main/assets/messaging/.eslintrc.mjs

@@ -2,10 +2,12 @@
  * 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/. */
 
-"use strict";
+import globals from "globals";
 
-module.exports = {
+export default [
-  env: {
+  {
-    webextensions: true,
+    languageOptions: {
+      globals: globals.webextensions,
     },
-};
+  },
+];

mobile/android/fenix/app/src/androidTest/java/org/mozilla/fenix/syncintegration/.eslintrc.mjs

@@ -2,9 +2,9 @@
  * 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/. */
 
-"use strict";
+export default [
-
+  {
-module.exports = {
+    languageOptions: {
       globals: {
         Bookmarks: false,
         EnableEngines: false,
@@ -12,4 +12,6 @@ module.exports = {
         Phase: false,
         Sync: false,
       },
-};
+    },
+  },
+];

mobile/android/geckoview/src/androidTest/assets/web_extensions/.eslintrc.mjs

@@ -1,14 +1,20 @@
-"use strict";
+/* 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 = {
+import globals from "globals";
-  env: {
+
-    webextensions: true,
+export default [
-  },
+  {
+    languageOptions: {
       globals: {
+        ...globals.webextensions,
         ExtensionAPI: true,
         // available to frameScripts
         addMessageListener: false,
         content: false,
         sendAsyncMessage: false,
       },
-};
+    },
+  },
+];

mobile/shared/.eslintrc.mjs

@@ -2,10 +2,7 @@
  * 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/. */
 
-"use strict";
+export default [
-
-module.exports = {
-  overrides: [
   {
     files: [
       "chrome/geckoview/**",
@@ -50,5 +47,4 @@ module.exports = {
       ],
     },
   },
-  ],
+];
-};

mobile/shared/components/extensions/.eslintrc.mjs

@@ -2,28 +2,22 @@
  * 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/. */
 
-"use strict";
+import toolkitConfig from "../../../../toolkit/components/extensions/.eslintrc.mjs";
+import parentConfig from "../../../../toolkit/components/extensions/parent/.eslintrc.mjs";
+import childConfig from "../../../../toolkit/components/extensions/child/.eslintrc.mjs";
 
-const {
+export default [
-  globals: globalsParent,
+  ...toolkitConfig,
-} = require("../../../../toolkit/components/extensions/parent/.eslintrc.js");
-
-const {
-  globals: globalsChild,
-} = require("../../../../toolkit/components/extensions/child/.eslintrc.js");
-
-module.exports = {
-  extends: "../../../../toolkit/components/extensions/.eslintrc.js",
   // Ideally mobile should also follow the convention of
   // parent/ext-*.js for parent scripts and
   // child/ext-*.js for child scripts,
   // but the current file structure predates the parent/ vs child/ separation.
-  overrides: [
   {
     files: ["ext-*.js"],
-      excludedFiles: ["ext-c-*.js"],
+    ignores: ["ext-c-*.js"],
+    languageOptions: {
       globals: {
-        ...globalsParent,
+        ...parentConfig[0].languageOptions.globals,
         // These globals are defined in ext-android.js and can only be used in
         // the extension files that run in the parent process.
         EventDispatcher: true,
@@ -34,13 +28,11 @@ module.exports = {
         windowTracker: true,
       },
     },
+  },
   {
     files: ["ext-c-*.js"],
-      globals: {
-        ...globalsChild,
     // If there were ever globals exported in ext-c-android.js for common
     // use, then they would appear here.
+    ...childConfig[0],
   },
-    },
+];
-  ],
-};

mobile/shared/components/extensions/test/mochitest/.eslintrc.mjs

@@ -1,6 +1,7 @@
-"use strict";
+/* 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 = {
+import config from "../../../../../../toolkit/components/extensions/test/mochitest/.eslintrc.mjs";
-  extends:
+
-    "../../../../../../toolkit/components/extensions/test/mochitest/.eslintrc.js",
+export default config;
-};

mobile/shared/components/extensions/test/xpcshell/.eslintrc.mjs

@@ -1,6 +1,7 @@
-"use strict";
+/* 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 = {
+import config from "../../../../../../toolkit/components/extensions/test/xpcshell/.eslintrc.mjs";
-  extends:
+
-    "../../../../../../toolkit/components/extensions/test/xpcshell/.eslintrc.js",
+export default config;
-};

netwerk/test/perf/.eslintrc.mjs

@@ -2,11 +2,16 @@
  * 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/. */
 
-"use strict";
+import globals from "globals";
 
-module.exports = {
+export default [
-  env: {
+  {
-    browser: true,
+    files: ["**/*.js"],
-    node: true,
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+        ...globals.node,
       },
-};
+    },
+  },
+];

remote/marionette/.eslintrc.mjs

@@ -2,13 +2,13 @@
  * 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/. */
 
-"use strict";
-
 // inherits from ../../tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js
 
-module.exports = {
+export default [
+  {
     rules: {
       camelcase: ["error", { properties: "never" }],
       "no-var": "error",
     },
-};
+  },
+];

remote/marionette/test/xpcshell/.eslintrc.mjs

@@ -1,7 +1,11 @@
-"use strict";
+/* 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 = {
+export default [
+  {
     rules: {
       camelcase: "off",
     },
-};
+  },
+];

security/.eslintrc.mjs

@@ -2,9 +2,8 @@
  * 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/. */
 
-"use strict";
+export default [
-
+  {
-module.exports = {
     rules: {
       // Enforce return statements in callbacks of array methods.
       "array-callback-return": "error",
@@ -43,4 +42,5 @@ module.exports = {
       // Disallow Yoda conditions.
       yoda: ["error", "never"],
     },
-};
+  },
+];

security/manager/ssl/tests/.eslintrc.mjs

@@ -1,8 +1,12 @@
-"use strict";
+/* 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 = {
+export default [
+  {
     rules: {
       // Disallow non-top level |var| declarations.
       "mozilla/var-only-at-top-level": "error",
     },
-};
+  },
+];

security/manager/tools/.eslintrc.mjs

@@ -2,12 +2,14 @@
  * 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/. */
 
-"use strict";
+export default [
-
+  {
-module.exports = {
+    languageOptions: {
       globals: {
         // JS files in this folder are commonly xpcshell scripts where |arguments|
         // is defined in the global scope.
         arguments: false,
       },
-};
+    },
+  },
+];

services/sync/tests/tps/.eslintrc.mjs

@@ -1,6 +1,10 @@
-"use strict";
+/* 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 = {
+export default [
+  {
+    languageOptions: {
       globals: {
         // Injected into tests via tps.sys.mjs
         Addons: false,
@@ -25,4 +29,6 @@ module.exports = {
         Windows: false,
         WipeServer: false,
       },
-};
+    },
+  },
+];

taskcluster/docker/index-task/.eslintrc.mjs

@@ -2,10 +2,10 @@
  * 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/. */
 
-"use strict";
+import globals from "globals";
 
-module.exports = {
+export default [
-  env: {
+  {
-    node: true,
+    languageOptions: { globals: globals.node },
   },
-};
+];

taskcluster/docker/periodic-updates/.eslintrc.mjs

@@ -2,14 +2,15 @@
  * 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/. */
 
-"use strict";
+export default [
-
+  {
-module.exports = {
+    languageOptions: {
       globals: {
         // JS files in this folder are commonly xpcshell scripts where |arguments|
         // is defined in the global scope.
         arguments: false,
       },
+    },
     rules: {
       // Enforce return statements in callbacks of array methods.
       "array-callback-return": "error",
@@ -48,4 +49,5 @@ module.exports = {
       // Disallow Yoda conditions.
       yoda: ["error", "never"],
     },
-};
+  },
+];

testing/mozbase/mozprofile/tests/files/dummy-profile/.eslintrc.mjs

@@ -1,7 +1,13 @@
-"use strict";
+/* 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 = {
+export default [
+  {
+    languageOptions: {
       globals: {
         user_pref: true,
       },
-};
+    },
+  },
+];

testing/performance/.eslintrc.mjs

@@ -2,11 +2,15 @@
  * 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/. */
 
-"use strict";
+import globals from "globals";
 
-module.exports = {
+export default [
-  env: {
+  {
-    browser: true,
+    languageOptions: {
-    node: true,
+      globals: {
+        ...globals.browser,
+        ...globals.node,
       },
-};
+    },
+  },
+];

testing/raptor/.eslintrc.mjs

@@ -2,23 +2,23 @@
  * 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/. */
 
-"use strict";
+import globals from "globals";
-
+import mozilla from "eslint-plugin-mozilla";
-module.exports = {
-  env: {
-    webextensions: true,
-  },
 
+export default [
+  {
+    languageOptions: {
       globals: {
+        ...globals.webextensions,
         getTestConfig: false,
         startMark: true,
         endMark: true,
         name: true,
       },
-
+    },
-  plugins: ["mozilla"],
+    plugins: { mozilla },
-
     rules: {
       "mozilla/avoid-Date-timing": "error",
     },
-};
+  },
+];

testing/talos/.eslintrc.mjs

@@ -2,9 +2,11 @@
  * 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/. */
 
-"use strict";
+import mozilla from "eslint-plugin-mozilla";
 
-module.exports = {
+export default [
+  {
+    languageOptions: {
       globals: {
         Cc: false,
         Ci: false,
@@ -27,10 +29,11 @@ module.exports = {
         TalosParentProfiler: true,
         tpRecordTime: true,
       },
-
+    },
-  plugins: ["mozilla"],
+    plugins: { mozilla },
 
     rules: {
       "mozilla/avoid-Date-timing": "error",
     },
-};
+  },
+];

testing/talos/talos/tests/devtools/addon/content/.eslintrc.mjs

@@ -1,7 +1,13 @@
-"use strict";
+/* 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 = {
+import mozilla from "eslint-plugin-mozilla";
-  plugins: ["react"],
+
+export default [
+  {
+    plugins: { mozilla },
+    languageOptions: {
       globals: {
         exports: true,
         isWorker: true,
@@ -11,6 +17,7 @@ module.exports = {
         require: true,
         dampWindow: true,
       },
+    },
     rules: {
       "no-unused-vars": ["error", { argsIgnorePattern: "^_", vars: "all" }],
       // These are the rules that have been configured so far to match the
@@ -23,4 +30,5 @@ module.exports = {
       "mozilla/reject-importGlobalProperties": ["error", "everything"],
       "mozilla/var-only-at-top-level": "error",
     },
-};
+  },
+];

testing/talos/talos/tests/perf-reftest-singletons/.eslintrc.mjs

@@ -1,5 +1,11 @@
+/* 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/. */
+
+export default [
   {
-  "rules": {
+    rules: {
-    "no-undef": "off"
+      "no-undef": "off",
-  }
+    },
-}
+  },
+];

testing/talos/talos/tests/perf-reftest/.eslintrc.mjs

@@ -1,5 +1,11 @@
+/* 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/. */
+
+export default [
   {
-  "rules": {
+    rules: {
-    "no-undef": "off"
+      "no-undef": "off",
-  }
+    },
-}
+  },
+];

tools/lint/eslint/.eslintrc.mjs

@@ -2,23 +2,20 @@
  * 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/. */
 
-"use strict";
+import globals from "globals";
+import eslintPlugin from "eslint-plugin-eslint-plugin";
 
-module.exports = {
+export default [
-  plugins: ["eslint-plugin"],
+  {
-  extends: ["plugin:eslint-plugin/recommended"],
+    ...eslintPlugin.configs["flat/recommended"],
-  // eslint-plugin-mozilla runs under node, so we need a more restrictive
+    languageOptions: {
-  // environment / parser setup here than the rest of mozilla-central.
+      globals: globals.node,
-  env: {
-    browser: false,
-    node: true,
-  },
-  parser: "espree",
       parserOptions: {
         // This should match with the minimum node version that the ESLint CI
         // process uses (check the linux64-node toolchain).
         ecmaVersion: 12,
       },
+    },
 
     rules: {
       camelcase: ["error", { properties: "never" }],
@@ -27,4 +24,16 @@ module.exports = {
       "one-var": ["error", "never"],
       strict: ["error", "global"],
     },
-};
+  },
+  {
+    files: ["eslint-plugin-mozilla/scripts/createExports.js"],
+    languageOptions: {
+      sourceType: "script",
+      parserOptions: {
+        ecmaFeatures: {
+          globalReturn: true,
+        },
+      },
+    },
+  },
+];

tools/lint/eslint/eslint-plugin-mozilla/lib/configs/.eslintrc.mjs

@@ -1,8 +1,12 @@
-"use strict";
+/* 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 = {
+export default [
+  {
     rules: {
       // Require object keys to be sorted.
       "sort-keys": "error",
     },
-};
+  },
+];

tools/lint/test/files/license/.eslintrc.mjs

@@ -1,5 +1,3 @@
 
 // Dot file to verify that it works
 // without license
-
-"use strict";

tools/tryselect/selectors/chooser/.eslintrc.mjs

@@ -2,15 +2,17 @@
  * 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/. */
 
-"use strict";
+import globals from "globals";
 
-module.exports = {
+export default [
-  env: {
+  {
-    jquery: true,
+    languageOptions: {
-  },
       globals: {
+        ...globals.jquery,
         apply: true,
         applyChunks: true,
         tasks: true,
       },
-};
+    },
+  },
+];

tools/ts/.eslintrc.mjs

@@ -2,17 +2,19 @@
  * 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/. */
 
-"use strict";
+import eslintPlugin from "eslint-plugin-eslint-plugin";
+import globals from "globals";
 
-module.exports = {
+export default [
-  plugins: ["eslint-plugin"],
+  {
-  extends: ["plugin:eslint-plugin/recommended"],
+    plugins: { "eslint-plugin": eslintPlugin },
-  env: {
+    ...eslintPlugin.configs["flat/recommended"],
-    browser: false,
+    languageOptions: {
-    node: true,
+      globals: { ...globals.browser, ...globals.node },
     },
     rules: {
       "no-console": "off",
       strict: ["error", "global"],
     },
-};
+  },
+];