tools: update ESLint to current version

We have been stalled on ESLint 3.8.0 for some time. Current ESLint is
3.13.0. We have been unable to upgrade because of more aggressive
reporting on some rules, including indentation.

ESLint configuration options and bugfixes are now such that we can
reasonably upgrade.

PR-URL: #10561
Reviewed-By: Teddy Katz <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Sam Roberts <[email protected]>

Author: Trott

.eslintrc

@@ -84,7 +84,11 @@ rules:
   eol-last: 2
   func-call-spacing: 2
   func-name-matching: 2
-  indent: [2, 2, {SwitchCase: 1, MemberExpression: 1}]
+  indent: [2, 2, {ArrayExpression: first,
+                  CallExpression: {arguments: first},
+                  MemberExpression: 1, 
+                  ObjectExpression: first,
+                  SwitchCase: 1}]
   key-spacing: [2, {mode: minimum}]
   keyword-spacing: 2
   linebreak-style: [2, unix]

tools/eslint/LICENSE

@@ -1,5 +1,5 @@
 ESLint
-Copyright jQuery Foundation and other contributors, https://jquery.org/
+Copyright JS Foundation and other contributors, https://js.foundation
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

tools/eslint/README.md

@@ -13,7 +13,7 @@
 [Rules](http://eslint.org/docs/rules/) |
 [Contributing](http://eslint.org/docs/developer-guide/contributing) |
 [Reporting Bugs](http://eslint.org/docs/developer-guide/contributing/reporting-bugs) |
-[Code of Conduct](https://jquery.org/conduct/) |
+[Code of Conduct](https://js.foundation/conduct/) |
 [Twitter](https://twitter.com/geteslint) |
 [Mailing List](https://groups.google.com/group/eslint) |
 [Chat Room](https://gitter.im/eslint/eslint)
@@ -210,10 +210,7 @@ ESLint has full support for ECMAScript 6. By default, this support is off. You c
 
 ESLint doesn't natively support experimental ECMAScript language features. You can use [babel-eslint](https://github.com/babel/babel-eslint) to use any option available in Babel.
 
-Once a language feature has been adopted into the ECMAScript standard, we will accept
-issues and pull requests related to the new feature, subject to our [contributing
-guidelines](http://eslint.org/docs/developer-guide/contributing). Until then, please use
-the appropriate parser and plugin(s) for your experimental feature.
+Once a language feature has been adopted into the ECMAScript standard (stage 4 according to the [TC39 process](https://tc39.github.io/process-document/)), we will accept issues and pull requests related to the new feature, subject to our [contributing guidelines](http://eslint.org/docs/developer-guide/contributing). Until then, please use the appropriate parser and plugin(s) for your experimental feature.
 
 ### Where to ask for help?
 

tools/eslint/bin/eslint.js

@@ -5,7 +5,7 @@
  * @author Nicholas C. Zakas
  */
 
-/* eslint no-console:off, no-process-exit:off */
+/* eslint no-console:off */
 
 "use strict";
 
@@ -36,7 +36,7 @@ const concat = require("concat-stream"),
 // Execution
 //------------------------------------------------------------------------------
 
-process.on("uncaughtException", function(err) {
+process.once("uncaughtException", err => {
 
     // lazy load
     const lodash = require("lodash");
@@ -51,17 +51,17 @@ process.on("uncaughtException", function(err) {
         console.log(err.stack);
     }
 
-    process.exit(1);
+    process.exitCode = 1;
 });
 
 if (useStdIn) {
-    process.stdin.pipe(concat({ encoding: "string" }, function(text) {
+    process.stdin.pipe(concat({ encoding: "string" }, text => {
         process.exitCode = cli.execute(process.argv, text);
     }));
 } else if (init) {
     const configInit = require("../lib/config/config-initializer");
 
-    configInit.initializeConfig(function(err) {
+    configInit.initializeConfig(err => {
         if (err) {
             process.exitCode = 1;
             console.error(err.message);

tools/eslint/conf/eslint.json

@@ -4,6 +4,7 @@
     "rules": {
         "no-alert": "off",
         "no-array-constructor": "off",
+        "no-await-in-loop": "off",
         "no-bitwise": "off",
         "no-caller": "off",
         "no-case-declarations": "error",
@@ -41,7 +42,7 @@
         "no-fallthrough": "error",
         "no-floating-decimal": "off",
         "no-func-assign": "error",
-        "no-global-assign": "off",
+        "no-global-assign": "error",
         "no-implicit-coercion": "off",
         "no-implicit-globals": "off",
         "no-implied-eval": "off",
@@ -63,9 +64,9 @@
         "no-multi-spaces": "off",
         "no-multi-str": "off",
         "no-multiple-empty-lines": "off",
-        "no-native-reassign": "error",
+        "no-native-reassign": "off",
         "no-negated-condition": "off",
-        "no-negated-in-lhs": "error",
+        "no-negated-in-lhs": "off",
         "no-nested-ternary": "off",
         "no-new": "off",
         "no-new-func": "off",
@@ -91,6 +92,7 @@
         "no-restricted-properties": "off",
         "no-restricted-syntax": "off",
         "no-return-assign": "off",
+        "no-return-await": "off",
         "no-script-url": "off",
         "no-self-assign": "error",
         "no-self-compare": "off",
@@ -115,7 +117,7 @@
         "no-unneeded-ternary": "off",
         "no-unreachable": "error",
         "no-unsafe-finally": "error",
-        "no-unsafe-negation": "off",
+        "no-unsafe-negation": "error",
         "no-unused-expressions": "off",
         "no-unused-labels": "error",
         "no-unused-vars": "error",
@@ -126,6 +128,7 @@
         "no-useless-constructor": "off",
         "no-useless-escape": "off",
         "no-useless-rename": "off",
+        "no-useless-return": "off",
         "no-void": "off",
         "no-var": "off",
         "no-warning-comments": "off",
@@ -141,6 +144,7 @@
         "brace-style": "off",
         "callback-return": "off",
         "camelcase": "off",
+        "capitalized-comments": "off",
         "class-methods-use-this": "off",
         "comma-dangle": "off",
         "comma-spacing": "off",
@@ -200,6 +204,7 @@
         "padded-blocks": "off",
         "prefer-arrow-callback": "off",
         "prefer-const": "off",
+        "prefer-destructuring": "off",
         "prefer-numeric-literals": "off",
         "prefer-reflect": "off",
         "prefer-rest-params": "off",
@@ -208,6 +213,7 @@
         "quote-props": "off",
         "quotes": "off",
         "radix": "off",
+        "require-await": "off",
         "require-jsdoc": "off",
         "require-yield": "error",
         "rest-spread-spacing": "off",