[9.x] Backport a lot of things

.eslintignore

@@ -10,3 +10,4 @@ tools/remark-*
 node_modules
 benchmark/tmp
 doc/**/*.js
+!.eslintrc.js

.eslintrc.js

@@ -0,0 +1,278 @@
+'use strict';
+
+const Module = require('module');
+const path = require('path');
+
+const NodePlugin = require('./tools/node_modules/eslint-plugin-node-core');
+NodePlugin.RULES_DIR = path.resolve(__dirname, 'tools', 'eslint-rules');
+
+const ModuleFindPath = Module._findPath;
+const hacks = [
+  'eslint-plugin-node-core',
+  'eslint-plugin-markdown',
+  'babel-eslint',
+];
+Module._findPath = (request, paths, isMain) => {
+  const r = ModuleFindPath(request, paths, isMain);
+  if (!r && hacks.includes(request)) {
+    try {
+      return require.resolve(`./tools/node_modules/${request}`);
+    } catch (err) {
+      return require.resolve(
+        `./tools/node_modules/eslint/node_modules/${request}`);
+    }
+  }
+  return r;
+};
+
+module.exports = {
+  root: true,
+  plugins: ['markdown', 'node-core'],
+  env: { node: true, es6: true },
+  parser: 'babel-eslint',
+  parserOptions: { sourceType: 'script' },
+  overrides: [
+    {
+      files: [
+        'doc/api/esm.md',
+        '*.mjs',
+        'test/es-module/test-esm-example-loader.js',
+      ],
+      parserOptions: { sourceType: 'module' },
+    },
+  ],
+  rules: {
+    // Possible Errors
+    // http://eslint.org/docs/rules/#possible-errors
+    'for-direction': 'error',
+    'no-control-regex': 'error',
+    'no-debugger': 'error',
+    'no-dupe-args': 'error',
+    'no-dupe-keys': 'error',
+    'no-duplicate-case': 'error',
+    'no-empty-character-class': 'error',
+    'no-ex-assign': 'error',
+    'no-extra-boolean-cast': 'error',
+    'no-extra-parens': ['error', 'functions'],
+    'no-extra-semi': 'error',
+    'no-func-assign': 'error',
+    'no-invalid-regexp': 'error',
+    'no-irregular-whitespace': 'error',
+    'no-obj-calls': 'error',
+    'no-template-curly-in-string': 'error',
+    'no-unexpected-multiline': 'error',
+    'no-unreachable': 'error',
+    'no-unsafe-negation': 'error',
+    'use-isnan': 'error',
+    'valid-typeof': 'error',
+
+    // Best Practices
+    // http://eslint.org/docs/rules/#best-practices
+    'accessor-pairs': 'error',
+    'array-callback-return': 'error',
+    'dot-location': ['error', 'property'],
+    'dot-notation': 'error',
+    eqeqeq: ['error', 'smart'],
+    'no-fallthrough': 'error',
+    'no-global-assign': 'error',
+    'no-multi-spaces': ['error', { ignoreEOLComments: true }],
+    'no-octal': 'error',
+    'no-proto': 'error',
+    'no-redeclare': 'error',
+    'no-restricted-properties': [
+      'error',
+      {
+        object: 'assert',
+        property: 'deepEqual',
+        message: 'Use assert.deepStrictEqual().',
+      },
+      {
+        object: 'assert',
+        property: 'notDeepEqual',
+        message: 'Use assert.notDeepStrictEqual().',
+      },
+      {
+        object: 'assert',
+        property: 'equal',
+        message: 'Use assert.astrictEqual() rather than assert.equal().',
+      },
+      {
+        object: 'assert',
+        property: 'notEqual',
+        message: 'Use assert.notStrictEqual() rather than assert.notEqual().',
+      },
+      {
+        property: '__defineGetter__',
+        message: '__defineGetter__ is deprecated.',
+      },
+      {
+        property: '__defineSetter__',
+        message: '__defineSetter__ is deprecated.',
+      }
+    ],
+    'no-return-await': 'error',
+    'no-self-assign': 'error',
+    'no-self-compare': 'error',
+    'no-throw-literal': 'error',
+    'no-unused-labels': 'error',
+    'no-useless-call': 'error',
+    'no-useless-concat': 'error',
+    'no-useless-escape': 'error',
+    'no-useless-return': 'error',
+    'no-void': 'error',
+    'no-with': 'error',
+
+    // Strict Mode
+    // http://eslint.org/docs/rules/#strict-mode
+    strict: ['error', 'global'],
+
+    // Variables
+    // http://eslint.org/docs/rules/#variables
+    'no-delete-var': 'error',
+    'no-undef': ['error', { typeof: true }],
+    'no-unused-vars': ['error', { args: 'none' }],
+    'no-use-before-define': ['error', {
+      classes: true,
+      functions: false,
+      variables: false,
+    }],
+
+    // Node.js and CommonJS
+    // http://eslint.org/docs/rules/#nodejs-and-commonjs
+    'no-mixed-requires': 'error',
+    'no-new-require': 'error',
+    'no-path-concat': 'error',
+    'no-restricted-modules': ['error', 'sys'],
+
+    // Stylistic Issues
+    // http://eslint.org/docs/rules/#stylistic-issues'
+    'block-spacing': 'error',
+    'brace-style': ['error', '1tbs', { allowSingleLine: true }],
+    'comma-dangle': ['error', 'only-multiline'],
+    'comma-spacing': 'error',
+    'comma-style': 'error',
+    'computed-property-spacing': 'error',
+    'eol-last': 'error',
+    'func-call-spacing': 'error',
+    'func-name-matching': 'error',
+    'func-style': ['error', 'declaration', { allowArrowFunctions: true }],
+    indent: ['error', 2, {
+      ArrayExpression: 'first',
+      CallExpression: { arguments: 'first' },
+      FunctionDeclaration: { parameters: 'first' },
+      FunctionExpression: { parameters: 'first' },
+      MemberExpression: 'off',
+      ObjectExpression: 'first',
+      SwitchCase: 1,
+    }],
+    'key-spacing': ['error', { mode: 'minimum' }],
+    'keyword-spacing': 'error',
+    'linebreak-style': ['error', 'unix'],
+    'max-len': ['error', {
+      code: 80,
+      ignorePattern: '^// Flags:',
+      ignoreRegExpLiterals: true,
+      ignoreUrls: true,
+      tabWidth: 2,
+    }],
+    'new-parens': 'error',
+    'no-lonely-if': 'error',
+    'no-mixed-spaces-and-tabs': 'error',
+    'no-multiple-empty-lines': ['error', { max: 2, maxEOF: 0, maxBOF: 0 }],
+    /* eslint-disable max-len, quotes */
+    'no-restricted-syntax': [
+      'error',
+      {
+        selector: "CallExpression[callee.object.name='assert'][callee.property.name='doesNotThrow']",
+        message: "Please replace `assert.doesNotThrow()` and add a comment next to the code instead."
+      },
+      {
+        selector: `CallExpression[callee.object.name='assert'][callee.property.name='rejects'][arguments.length<2]`,
+        message: 'assert.rejects() must be invoked with at least two arguments.',
+      },
+      {
+        selector: `CallExpression[callee.object.name='assert'][callee.property.name='throws'][arguments.1.type='Literal']:not([arguments.1.regex])`,
+        message: 'Use an object as second argument of assert.throws()',
+      },
+      {
+        selector: `CallExpression[callee.object.name='assert'][callee.property.name='throws'][arguments.length<2]`,
+        message: 'assert.throws() must be invoked with at least two arguments.',
+      },
+      {
+        selector: `CallExpression[callee.name='setTimeout'][arguments.length<2]`,
+        message: 'setTimeout() must be invoked with at least two arguments.',
+      },
+      {
+        selector: `CallExpression[callee.name='setInterval'][arguments.length<2]`,
+        message: 'setInterval() must be invoked with at least 2 arguments.',
+      },
+      {
+        selector: 'ThrowStatement > CallExpression[callee.name=/Error$/]',
+        message: 'Use new keyword when throwing an Error.',
+      }
+    ],
+    /* eslint-enable max-len, quotes */
+    'no-tabs': 'error',
+    'no-trailing-spaces': 'error',
+    'no-unsafe-finally': 'error',
+    'object-curly-spacing': ['error', 'always'],
+    'one-var-declaration-per-line': 'error',
+    'operator-linebreak': ['error', 'after'],
+    quotes: ['error', 'single', 'avoid-escape'],
+    semi: 'error',
+    'semi-spacing': 'error',
+    'space-before-blocks': ['error', 'always'],
+    'space-before-function-paren': ['error', {
+      anonymous: 'never',
+      named: 'never',
+      asyncArrow: 'always',
+    }],
+    'space-in-parens': ['error', 'never'],
+    'space-infix-ops': 'error',
+    'space-unary-ops': 'error',
+    'spaced-comment': ['error', 'always', {
+      'block': { 'balanced': true },
+      'exceptions': ['-']
+    }],
+    'unicode-bom': 'error',
+
+    // ECMAScript 6
+    // http://eslint.org/docs/rules/#ecmascript-6
+    'arrow-parens': ['error', 'always'],
+    'arrow-spacing': ['error', { before: true, after: true }],
+    'constructor-super': 'error',
+    'no-class-assign': 'error',
+    'no-confusing-arrow': 'error',
+    'no-const-assign': 'error',
+    'no-dupe-class-members': 'error',
+    'no-new-symbol': 'error',
+    'no-this-before-super': 'error',
+    'prefer-const': ['error', { ignoreReadBeforeAssign: true }],
+    'rest-spread-spacing': 'error',
+    'symbol-description': 'error',
+    'template-curly-spacing': 'error',
+
+    // Custom rules in from eslint-plugin-node-core
+    'node-core/no-unescaped-regexp-dot': 'error',
+  },
+  globals: {
+    COUNTER_HTTP_CLIENT_REQUEST: false,
+    COUNTER_HTTP_CLIENT_RESPONSE: false,
+    COUNTER_HTTP_SERVER_REQUEST: false,
+    COUNTER_HTTP_SERVER_RESPONSE: false,
+    COUNTER_NET_SERVER_CONNECTION: false,
+    COUNTER_NET_SERVER_CONNECTION_CLOSE: false,
+    DTRACE_HTTP_CLIENT_REQUEST: false,
+    DTRACE_HTTP_CLIENT_RESPONSE: false,
+    DTRACE_HTTP_SERVER_REQUEST: false,
+    DTRACE_HTTP_SERVER_RESPONSE: false,
+    DTRACE_NET_SERVER_CONNECTION: false,
+    DTRACE_NET_STREAM_END: false,
+    LTTNG_HTTP_CLIENT_REQUEST: false,
+    LTTNG_HTTP_CLIENT_RESPONSE: false,
+    LTTNG_HTTP_SERVER_REQUEST: false,
+    LTTNG_HTTP_SERVER_RESPONSE: false,
+    LTTNG_NET_SERVER_CONNECTION: false,
+    LTTNG_NET_STREAM_END: false
+  },
+};