Bug 1812550 - Update most mozilla plugin eslint rules to use 'latest' parser versions. r=Gijs,devtools-reviewers

This updates everything except for linting of eslint-plugin-mozilla which needs to work with older node versions.

Differential Revision: https://phabricator.services.mozilla.com/D186679

devtools/client/debugger/src/.eslintrc.js

@@ -29,7 +29,7 @@ module.exports = {
   },
   extends: ["prettier", "plugin:jest/recommended"],
   parserOptions: {
-    ecmaVersion: 2016,
+    ecmaVersion: "latest",
     sourceType: "module",
     ecmaFeatures: { jsx: true },
 

tools/lint/eslint/.eslintrc.js

@@ -15,6 +15,8 @@ module.exports = {
   },
   parser: "espree",
   parserOptions: {
+    // This should match with the minimum node version that the ESLint CI
+    // process uses (check the linux64-node toolchain).
     ecmaVersion: 12,
   },
 

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

@@ -116,7 +116,7 @@ module.exports = {
   ],
 
   parserOptions: {
-    ecmaVersion: 12,
+    ecmaVersion: "latest",
   },
 
   // When adding items to this file please check for effects on sub-directories.