Bug 1684905 - Fully enable globalThis for ESLint. r=Gijs,necko-reviewers,kershaw

Differential Revision: https://phabricator.services.mozilla.com/D100697

devtools/server/tests/xpcshell/head_dbg.js

@@ -75,8 +75,6 @@ async function startupAddonsManager() {
   const profileDir = do_get_profile().clone();
   profileDir.append("extensions");
 
-  /* global globalThis */
-  /* See Bug 1595810 to add globalThis to eslint */
   AddonTestUtils.init(globalThis);
   AddonTestUtils.overrideCertDB();
   AddonTestUtils.appInfo = getAppInfo();

devtools/shared/resources/tests/test_worker.js

@@ -3,7 +3,6 @@
 
 "use strict";
 
-/* global globalThis */
 console.log("[WORKER] started", globalThis.location.toString(), globalThis);
 
 globalThis.onmessage = function(e) {

netwerk/test/unit/test_duplicate_headers.js

@@ -5,7 +5,6 @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // Test infrastructure
-/* global globalThis */
 
 "use strict";
 

netwerk/test/unit/test_headers.js

@@ -14,7 +14,6 @@
 //
 //  For tests that need duplicate copies of headers to be sent, see
 //  test_duplicate_headers.js
-/* global globalThis */
 
 "use strict";
 

tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js

@@ -14,7 +14,7 @@
 module.exports = {
   env: {
     browser: true,
-    es6: true,
+    es2021: true,
     "mozilla/privileged": true,
   },
 
@@ -77,7 +77,7 @@ module.exports = {
   ],
 
   parserOptions: {
-    ecmaVersion: 11,
+    ecmaVersion: 12,
   },
 
   // When adding items to this file please check for effects on sub-directories.

tools/lint/eslint/eslint-plugin-mozilla/package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "eslint-plugin-mozilla",
-  "version": "2.9.1",
+  "version": "2.9.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

tools/lint/eslint/eslint-plugin-mozilla/package.json

@@ -1,6 +1,6 @@
 {
   "name": "eslint-plugin-mozilla",
-  "version": "2.9.1",
+  "version": "2.9.2",
   "description": "A collection of rules that help enforce JavaScript coding standard in the Mozilla project.",
   "keywords": [
     "eslint",