Bug 1783406 - Provide a separate environment for the globals in recommended ESLint config r=Standard8

Differential Revision: https://phabricator.services.mozilla.com/D157665

js/src/builtin/.eslintrc.js

@@ -22,6 +22,7 @@ module.exports = {
         // "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,
@@ -136,22 +137,6 @@ module.exports = {
         Record: "off",
         Temporal: "off",
         Tuple: "off",
-
-        // Undefine globals from Mozilla recommended file
-        // "tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js".
-        Cc: "off",
-        ChromeUtils: "off",
-        Ci: "off",
-        Components: "off",
-        Cr: "off",
-        Cu: "off",
-        Debugger: "off",
-        InstallTrigger: "off",
-        InternalError: "off",
-        Services: "off",
-        dump: "off",
-        openDialog: "off",
-        uneval: "off",
       },
     },
   ],

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

@@ -16,30 +16,11 @@ module.exports = {
     browser: true,
     es2021: true,
     "mozilla/privileged": true,
+    "mozilla/specific": true,
   },
 
   extends: ["eslint:recommended", "plugin:prettier/recommended"],
 
-  globals: {
-    // These are all specific to Firefox unless otherwise stated.
-    Cc: false,
-    ChromeUtils: false,
-    Ci: false,
-    Components: false,
-    Cr: false,
-    Cu: false,
-    Debugger: false,
-    InstallTrigger: false,
-    // https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/InternalError
-    InternalError: true,
-    Services: false,
-    // https://developer.mozilla.org/docs/Web/API/Window/dump
-    dump: true,
-    openDialog: false,
-    // https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/uneval
-    uneval: false,
-  },
-
   overrides: [
     {
       // System mjs files and jsm files are not loaded in the browser scope,

tools/lint/eslint/eslint-plugin-mozilla/lib/environments/specific.js

@@ -0,0 +1,31 @@
+/**
+ * @fileoverview Defines the environment for the Firefox browser. Allows global
+ *               variables which are non-standard and specific to Firefox.
+ *
+ * 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/.
+ */
+
+"use strict";
+
+module.exports = {
+  globals: {
+    Cc: false,
+    ChromeUtils: false,
+    Ci: false,
+    Components: false,
+    Cr: false,
+    Cu: false,
+    Debugger: false,
+    InstallTrigger: false,
+    // https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/InternalError
+    InternalError: true,
+    Services: false,
+    // https://developer.mozilla.org/docs/Web/API/Window/dump
+    dump: true,
+    openDialog: false,
+    // https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/uneval
+    uneval: false,
+  },
+};

tools/lint/eslint/eslint-plugin-mozilla/lib/index.js

@@ -30,6 +30,7 @@ module.exports = {
     simpletest: require("../lib/environments/simpletest.js"),
     sjs: require("../lib/environments/sjs.js"),
     "special-powers-sandbox": require("../lib/environments/special-powers-sandbox.js"),
+    specific: require("../lib/environments/specific"),
     privileged: require("../lib/environments/privileged.js"),
     xpcshell: require("../lib/environments/xpcshell.js"),
   },