tools: update ESLint to v4.0.0

Update ESLint and configuration to version 4.0.0.

PR-URL: #13645
Reviewed-By: Teddy Katz <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Refael Ackermann <[email protected]>
Reviewed-By: Sam Roberts <[email protected]>
Reviewed-By: Alexey Orlenko <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: Trott

.eslintrc.yaml

@@ -40,7 +40,7 @@ rules:
   eqeqeq: [2, smart]
   no-fallthrough: 2
   no-global-assign: 2
-  no-multi-spaces: 2
+  no-multi-spaces: [2, {ignoreEOLComments: true}]
   no-octal: 2
   no-proto: 2
   no-redeclare: 2
@@ -98,11 +98,18 @@ rules:
   func-call-spacing: 2
   func-name-matching: 2
   func-style: [2, declaration, {allowArrowFunctions: true}]
-  indent: [2, 2, {ArrayExpression: first,
-                  CallExpression: {arguments: first},
-                  MemberExpression: 1,
-                  ObjectExpression: first,
-                  SwitchCase: 1}]
+  # indent: [2, 2, {ArrayExpression: first,
+  #                 CallExpression: {arguments: first},
+  #                 FunctionDeclaration: {parameters: first},
+  #                 FunctionExpression: {parameters: first},
+  #                 MemberExpression: off,
+  #                 ObjectExpression: first,
+  #                 SwitchCase: 1}]
+  indent-legacy: [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]
@@ -122,7 +129,7 @@ rules:
   }, {
     selector: "ThrowStatement > CallExpression[callee.name=/Error$/]",
     message: "Use new keyword when throwing an Error."
-    }]
+  }]
   no-tabs: 2
   no-trailing-spaces: 2
   one-var-declaration-per-line: 2
@@ -131,7 +138,11 @@ rules:
   semi: 2
   semi-spacing: 2
   space-before-blocks: [2, always]
-  space-before-function-paren: [2, never]
+  space-before-function-paren: [2, {
+    "anonymous": "never",
+    "named": "never",
+    "asyncArrow": "always"
+  }]
   space-in-parens: [2, never]
   space-infix-ops: 2
   space-unary-ops: 2

test/message/throw_in_line_with_tabs.js

@@ -19,7 +19,7 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-/* eslint-disable indent, no-tabs */
+/* eslint-disable indent-legacy, no-tabs */
 'use strict';
 require('../common');
 

tools/eslint/CHANGELOG.md

@@ -1,4 +1,3 @@
-ESLint
 Copyright JS Foundation and other contributors, https://js.foundation
 
 Permission is hereby granted, free of charge, to any person obtaining a copy

tools/eslint/LICENSE

@@ -5,6 +5,7 @@
 [![Downloads][downloads-image]][downloads-url]
 [![Bountysource](https://www.bountysource.com/badge/tracker?tracker_id=282608)](https://www.bountysource.com/trackers/282608-eslint?utm_source=282608&utm_medium=shield&utm_campaign=TRACKER_BADGE)
 [![Join the chat at https://gitter.im/eslint/eslint](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/eslint/eslint?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bhttps%3A%2F%2Fgithub.com%2Feslint%2Feslint.svg?type=shield)](https://app.fossa.io/projects/git%2Bhttps%3A%2F%2Fgithub.com%2Feslint%2Feslint?ref=badge_shield)
 
 # ESLint
 
@@ -13,7 +14,7 @@
 [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://js.foundation/conduct/) |
+[Code of Conduct](https://js.foundation/community/code-of-conduct) |
 [Twitter](https://twitter.com/geteslint) |
 [Mailing List](https://groups.google.com/group/eslint) |
 [Chat Room](https://gitter.im/eslint/eslint)
@@ -123,7 +124,7 @@ These folks keep the project moving and are resources for help.
 * Michael Ficarra ([@michaelficarra](https://github.com/michaelficarra))
 * Mark Pedrotti ([@pedrottimark](https://github.com/pedrottimark))
 * Oleg Gaidarenko ([@markelog](https://github.com/markelog))
-* Mike Sherov [@mikesherov](https://github.com/mikesherov))
+* Mike Sherov ([@mikesherov](https://github.com/mikesherov))
 * Henry Zhu ([@hzoo](https://github.com/hzoo))
 * Marat Dulin ([@mdevils](https://github.com/mdevils))
 * Alexej Yaroshevich ([@zxqfox](https://github.com/zxqfox))
@@ -172,6 +173,10 @@ ESLint follows [semantic versioning](http://semver.org). However, due to the nat
 
 According to our policy, any minor update may report more errors than the previous release (ex: from a bug fix). As such, we recommend using the tilde (`~`) in `package.json` e.g. `"eslint": "~3.1.0"` to guarantee the results of your builds.
 
+## License
+
+[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bhttps%3A%2F%2Fgithub.com%2Feslint%2Feslint.svg?type=large)](https://app.fossa.io/projects/git%2Bhttps%3A%2F%2Fgithub.com%2Feslint%2Feslint?ref=badge_large)
+
 ## Frequently Asked Questions
 
 ### How is ESLint different from JSHint?
@@ -205,7 +210,7 @@ Yes, ESLint natively supports parsing JSX syntax (this must be enabled in [confi
 
 ### What about ECMAScript 6 support?
 
-ESLint has full support for ECMAScript 6. By default, this support is off. You can enable ECMAScript 6 support through [configuration](http://eslint.org/docs/user-guide/configuring).
+ESLint has full support for ECMAScript 6. By default, this support is off. You can enable ECMAScript 6 syntax and global variables through [configuration](http://eslint.org/docs/user-guide/configuring).
 
 ### What about experimental features?
 

tools/eslint/README.md

@@ -61,14 +61,12 @@ if (useStdIn) {
 } else if (init) {
     const configInit = require("../lib/config/config-initializer");
 
-    configInit.initializeConfig(err => {
-        if (err) {
-            process.exitCode = 1;
-            console.error(err.message);
-            console.error(err.stack);
-        } else {
-            process.exitCode = 0;
-        }
+    configInit.initializeConfig().then(() => {
+        process.exitCode = 0;
+    }).catch(err => {
+        process.exitCode = 1;
+        console.error(err.message);
+        console.error(err.stack);
     });
 } else {
     process.exitCode = cli.execute(process.argv);

tools/eslint/bin/eslint.js

@@ -0,0 +1,15 @@
+{
+    "type": "object",
+    "properties": {
+        "root": { "type": "boolean" },
+        "globals": { "type": ["object"] },
+        "parser": { "type": ["string", "null"] },
+        "env": { "type": "object" },
+        "plugins": { "type": ["array"] },
+        "settings": { "type": "object" },
+        "extends": { "type": ["string", "array"] },
+        "rules": { "type": "object" },
+        "parserOptions": { "type": "object" }
+    },
+    "additionalProperties": false
+}

tools/eslint/conf/config-schema.json

@@ -12,11 +12,9 @@ module.exports = {
     useEslintrc: true,
     envs: [],
     globals: [],
-    rules: {},
     extensions: [".js"],
     ignore: true,
     ignorePath: null,
-    parser: "",     // must be empty
     cache: false,
 
     // in order to honor the cacheFile option if specified

tools/eslint/conf/cli-options.js tools/eslint/conf/default-cli-options.js

@@ -0,0 +1,33 @@
+/**
+ * @fileoverview Default config options
+ * @author Teddy Katz
+ */
+
+"use strict";
+
+/**
+ * Freezes an object and all its nested properties
+ * @param {Object} obj The object to deeply freeze
+ * @returns {Object} `obj` after freezing it
+ */
+function deepFreeze(obj) {
+    if (obj === null || typeof obj !== "object") {
+        return obj;
+    }
+
+    Object.keys(obj).map(key => obj[key]).forEach(deepFreeze);
+    return Object.freeze(obj);
+}
+
+module.exports = deepFreeze({
+    env: {},
+    globals: {},
+    rules: {},
+    settings: {},
+    parser: "espree",
+    parserOptions: {
+        ecmaVersion: 5,
+        sourceType: "script",
+        ecmaFeatures: {}
+    }
+});

tools/eslint/conf/default-config-options.js

@@ -10,7 +10,8 @@
 //------------------------------------------------------------------------------
 
 const load = require("../lib/load-rules"),
-    rules = require("../lib/rules");
+    Rules = require("../lib/rules");
+const rules = new Rules();
 
 //------------------------------------------------------------------------------
 // Helpers

tools/eslint/conf/eslint-all.js

@@ -10,15 +10,14 @@
 /* eslint-disable sort-keys */
 
 module.exports = {
-    parser: "espree",
-    ecmaFeatures: {},
-
     rules: {
 
         /* eslint-enable sort-keys */
         "accessor-pairs": "off",
+        "array-bracket-newline": "off",
         "array-bracket-spacing": "off",
         "array-callback-return": "off",
+        "array-element-newline": "off",
         "arrow-body-style": "off",
         "arrow-parens": "off",
         "arrow-spacing": "off",
@@ -43,6 +42,7 @@ module.exports = {
         "dot-notation": "off",
         "eol-last": "off",
         "eqeqeq": "off",
+        "for-direction": "off",
         "func-call-spacing": "off",
         "func-name-matching": "off",
         "func-names": "off",
@@ -55,6 +55,7 @@ module.exports = {
         "id-length": "off",
         "id-match": "off",
         "indent": "off",
+        "indent-legacy": "off",
         "init-declarations": "off",
         "jsx-quotes": "off",
         "key-spacing": "off",
@@ -80,11 +81,12 @@ module.exports = {
         "no-array-constructor": "off",
         "no-await-in-loop": "off",
         "no-bitwise": "off",
+        "no-buffer-constructor": "off",
         "no-caller": "off",
         "no-case-declarations": "error",
         "no-catch-shadow": "off",
         "no-class-assign": "error",
-        "no-compare-neg-zero": "off",
+        "no-compare-neg-zero": "error",
         "no-cond-assign": "error",
         "no-confusing-arrow": "off",
         "no-console": "error",
@@ -202,7 +204,7 @@ module.exports = {
         "no-useless-computed-key": "off",
         "no-useless-concat": "off",
         "no-useless-constructor": "off",
-        "no-useless-escape": "off",
+        "no-useless-escape": "error",
         "no-useless-rename": "off",
         "no-useless-return": "off",
         "no-var": "off",
@@ -212,14 +214,15 @@ module.exports = {
         "no-with": "off",
         "nonblock-statement-body-position": "off",
         "object-curly-newline": "off",
-        "object-curly-spacing": ["off", "never"],
+        "object-curly-spacing": "off",
         "object-property-newline": "off",
         "object-shorthand": "off",
         "one-var": "off",
         "one-var-declaration-per-line": "off",
         "operator-assignment": "off",
         "operator-linebreak": "off",
         "padded-blocks": "off",
+        "padding-line-between-statements": "off",
         "prefer-arrow-callback": "off",
         "prefer-const": "off",
         "prefer-destructuring": "off",
@@ -238,6 +241,7 @@ module.exports = {
         "rest-spread-spacing": "off",
         "semi": "off",
         "semi-spacing": "off",
+        "semi-style": "off",
         "sort-imports": "off",
         "sort-keys": "off",
         "sort-vars": "off",
@@ -248,6 +252,7 @@ module.exports = {
         "space-unary-ops": "off",
         "spaced-comment": "off",
         "strict": "off",
+        "switch-colon-spacing": "off",
         "symbol-description": "off",
         "template-curly-spacing": "off",
         "template-tag-spacing": "off",

tools/eslint/conf/eslint-recommended.js

@@ -5,8 +5,11 @@
 
 "use strict";
 
+const Linter = require("./linter");
+
 module.exports = {
-    linter: require("./eslint"),
+    linter: new Linter(),
+    Linter,
     CLIEngine: require("./cli-engine"),
     RuleTester: require("./testers/rule-tester"),
     SourceCode: require("./util/source-code")