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.eslintrc.js
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.eslintrc.js
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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// clang-format off
const path = require('path');
const rulesDirPlugin = require('eslint-plugin-rulesdir');
rulesDirPlugin.RULES_DIR = path.join(__dirname, 'scripts', 'eslint_rules', 'lib');
module.exports = {
'root': true,
'env': {'browser': true, 'es6': true},
'parser': '@typescript-eslint/parser',
'plugins': [
'@typescript-eslint',
'mocha',
'rulesdir',
'import',
'jsdoc',
],
'parserOptions': {'ecmaVersion': 9, 'sourceType': 'module'},
/**
* ESLint rules
*
* All available rules: http://eslint.org/docs/rules/
*/
'rules': {
/**
* Enforced rules
*/
// syntax preferences
'quotes': ['error', 'single', {'avoidEscape': true, 'allowTemplateLiterals': false}],
'semi': 'error',
'no-extra-semi': 'error',
'comma-style': ['error', 'last'],
'wrap-iife': ['error', 'inside'],
'spaced-comment': ['error', 'always', {'markers': ['*']}],
'eqeqeq': 'error',
'accessor-pairs': ['error', {'getWithoutSet': false, 'setWithoutGet': false}],
'curly': 'error',
'new-parens': 'error',
'func-call-spacing': 'error',
'arrow-parens': ['error', 'as-needed'],
'eol-last': 'error',
// anti-patterns
'no-caller': 'error',
'no-case-declarations': 'error',
'no-cond-assign': 'error',
'no-console': ['error', {'allow': ['assert', 'context', 'error', 'timeStamp', 'time', 'timeEnd', 'warn']}],
'no-debugger': 'error',
'no-dupe-keys': 'error',
'no-duplicate-case': 'error',
'no-else-return': ['error', {'allowElseIf': false}],
'no-empty-character-class': 'error',
'no-global-assign': 'error',
'no-implied-eval': 'error',
'no-labels': 'error',
'no-multi-str': 'error',
'no-new-object': 'error',
'no-octal-escape': 'error',
'no-self-compare': 'error',
'no-shadow-restricted-names': 'error',
'no-unreachable': 'error',
'no-unsafe-negation': 'error',
'no-unused-vars': ['error', {'args': 'none', 'vars': 'local'}],
'no-var': 'error',
'no-with': 'error',
'prefer-const': 'error',
'radix': 'error',
'valid-typeof': 'error',
'no-return-assign': ['error', 'always'],
'no-implicit-coercion': 'error',
// es2015 features
'require-yield': 'error',
'template-curly-spacing': ['error', 'never'],
// file whitespace
'no-multiple-empty-lines': ['error', {'max': 1}],
'no-mixed-spaces-and-tabs': 'error',
'no-trailing-spaces': 'error',
'linebreak-style': ['error', 'unix'],
/**
* Disabled, aspirational rules
*/
'indent': ['off', 2, {'SwitchCase': 1, 'CallExpression': {'arguments': 2}, 'MemberExpression': 2}],
// brace-style is disabled, as eslint cannot enforce 1tbs as default, but allman for functions
'brace-style': ['off', 'allman', {'allowSingleLine': true}],
// key-spacing is disabled, as some objects use value-aligned spacing, some not.
'key-spacing': ['off', {'beforeColon': false, 'afterColon': true, 'align': 'value'}],
// quote-props is diabled, as property quoting styles are too varied to enforce.
'quote-props': ['off', 'as-needed'],
// no-implicit-globals will prevent accidental globals
'no-implicit-globals': 'off',
'no-unused-private-class-members': 'error',
// forbids interfaces starting with an I prefix.
'@typescript-eslint/naming-convention':
['error', {'selector': 'interface', 'format': ['PascalCase'], 'custom': {'regex': '^I[A-Z]', 'match': false}}],
'@typescript-eslint/explicit-member-accessibility': 'off',
'@typescript-eslint/no-explicit-any': [
"error",
{
"ignoreRestArgs": true
}
],
// Closure does not properly typecheck default exports
'import/no-default-export': 'error',
/**
* Catch duplicate import paths. For example this would catch the following example:
* import {Foo} from './foo.js'
* import * as FooModule from './foo.js'
**/
'import/no-duplicates': 'error',
// Try to spot '// console.log()' left over from debugging
'rulesdir/commented_out_console': 'error',
// Prevent imports being commented out rather than deleted.
'rulesdir/commented_out_import': 'error',
// DevTools specific rules
'rulesdir/es_modules_import': 'error',
'rulesdir/check_license_header': 'error',
/**
* Ensures that JS Doc comments are properly aligned - all the starting
* `*` are in the right place.
*/
'jsdoc/check-alignment': 'error',
},
'overrides': [{
'files': ['*.ts'],
'parserOptions': {
'allowAutomaticSingleRunInference': true,
'project': path.join(__dirname, 'config', 'typescript', 'tsconfig.eslint.json'),
},
'rules': {
'@typescript-eslint/explicit-member-accessibility': ['error', {'accessibility': 'no-public'}],
'comma-dangle': 'off',
'@typescript-eslint/comma-dangle': ['error', 'always-multiline'],
// run just the TypeScript unused-vars rule, else we get duplicate errors
'no-unused-vars': 'off',
'@typescript-eslint/no-unused-vars': ['error', {'argsIgnorePattern': '^_'}],
// run just the TypeScript semi rule, else we get duplicate errors
'semi': 'off',
'@typescript-eslint/semi': 'error',
'@typescript-eslint/member-delimiter-style': [
'error', {
'multiline': {'delimiter': 'semi', 'requireLast': true},
'singleline': {'delimiter': 'comma', 'requireLast': false},
'overrides': {
'interface': {
'singleline': {'delimiter': 'semi', 'requireLast': false},
'multiline': {'delimiter': 'semi', 'requireLast': true}
},
'typeLiteral': {
'singleline': {'delimiter': 'comma', 'requireLast': false},
'multiline': {'delimiter': 'comma', 'requireLast': true}
}
}
}
],
'@typescript-eslint/no-floating-promises': ['error', {ignoreVoid: true}],
// func-call-spacing doesn't work well with .ts
'func-call-spacing': 'off',
'@typescript-eslint/func-call-spacing': 'error',
/**
* Enforce that enum members are explicitly defined:
* const enum Foo { A = 'a' } rather than const enum Foo { A }
*/
'@typescript-eslint/prefer-enum-initializers': 'error',
/**
* Ban non-null assertion operator, e.g.:
* this.foo!.toLowerCase()
*/
'@typescript-eslint/no-non-null-assertion': 'error',
'@typescript-eslint/consistent-type-imports': 'error',
'rulesdir/no_underscored_properties': 'error',
'rulesdir/prefer_readonly_keyword': 'error',
'rulesdir/inline_type_imports': 'error',
}
}, {
'files': ['*.test.ts', 'test/**/*.ts', '**/testing/*.ts'],
'rules': {
// errors on it('test') with no body
'mocha/no-pending-tests' : 'error',
// errors on {describe, it}.only
'mocha/no-exclusive-tests' : 'error',
'mocha/no-async-describe': 'error',
'mocha/no-global-tests': 'error',
'mocha/no-nested-tests': 'error',
'rulesdir/check_test_definitions' : 'error',
'rulesdir/avoid_assert_equal' : 'error',
'rulesdir/no_repeated_tests' : 'error',
'rulesdir/compare_arrays_with_assert_deepequal' : 'error',
'rulesdir/ban_screenshot_test_outside_perf_panel' : 'error',
'rulesdir/trace_engine_test_timeouts' : 'error',
'@typescript-eslint/naming-convention' :
[
'error',
{
'selector' :
[
'function', 'accessor', 'method', 'property',
'parameterProperty'
],
'format' : ['camelCase'],
},
{
// Allow PascalCase as well as it is used for dynamic module imports.
'selector' : 'variable',
'format' : ['camelCase', 'PascalCase', 'UPPER_CASE'],
},
{
'selector' : 'classProperty',
'modifiers' : ['static', 'readonly'],
'format' : ['UPPER_CASE'],
},
{
'selector' : 'enumMember',
'format' : ['PascalCase', 'UPPER_CASE'],
},
{
'selector' : ['typeLike'],
'format' : ['PascalCase'],
},
{
// Also allow UPPER_CASE so argument function to evaluate can take constants as arguments without renaming.
'selector' : 'parameter',
'format' : ['camelCase', 'UPPER_CASE'],
'leadingUnderscore' : 'allow',
},
{
// Object literals may be constructed as arguments to external libraries which follow different styles.
'selector' : ['objectLiteralMethod', 'objectLiteralProperty'],
'modifiers' : ['public'],
'format' : null,
},
],
'@typescript-eslint/no-non-null-assertion' : 'off',
},
'settings': {
'mocha/additionalCustomNames': [
{ 'name': 'describeWithDevtoolsExtension', 'type': 'suite', 'interfaces': [ 'BDD', 'TDD' ] },
{ 'name': 'describeWithEnvironment', 'type': 'suite', 'interfaces': [ 'BDD', 'TDD' ] },
{ 'name': 'describeWithLocale', 'type': 'suite', 'interfaces': [ 'BDD', 'TDD' ] },
{ 'name': 'describeWithMockConnection', 'type': 'suite', 'interfaces': [ 'BDD', 'TDD' ] },
{ 'name': 'describeWithRealConnection', 'type': 'suite', 'interfaces': [ 'BDD', 'TDD' ] },
{ 'name': 'itScreenshot', 'type': 'testCase', 'interfaces': [ 'BDD', 'TDD' ] },
]
}
}],
};
// clang-format on