// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
module.exports = {
'root': true,
'env': {
'browser': true,
'es2020': true,
},
'parserOptions': {
'ecmaVersion': 2020,
'sourceType': 'module',
},
'rules': {
// Enabled checks.
'brace-style': ['error', '1tbs'],
// https://google.github.io/styleguide/jsguide.html#features-arrays-trailing-comma
// https://google.github.io/styleguide/jsguide.html#features-objects-use-trailing-comma
'comma-dangle': ['error', 'always-multiline'],
'curly': ['error', 'multi-line', 'consistent'],
'new-parens': 'error',
'no-array-constructor': 'error',
'no-console': ['error', {allow: ['info', 'warn', 'error', 'assert']}],
'no-debugger': 'error',
'no-extra-boolean-cast': 'error',
'no-extra-semi': 'error',
'no-new-wrappers': 'error',
'no-restricted-imports': ['error', {
'paths': [{
'name': 'chrome://resources/polymer/v3_0/polymer/polymer_bundled.min.js',
'importNames': ['Polymer'],
'message': 'Use PolymerElement instead.',
},
{
'name': '//resources/polymer/v3_0/polymer/polymer_bundled.min.js',
'importNames': ['Polymer'],
'message': 'Use PolymerElement instead.',
}],
}],
'no-restricted-properties': [
'error',
{
'property': '__lookupGetter__',
'message': 'Use Object.getOwnPropertyDescriptor',
},
{
'property': '__lookupSetter__',
'message': 'Use Object.getOwnPropertyDescriptor',
},
{
'property': '__defineGetter__',
'message': 'Use Object.defineProperty',
},
{
'property': '__defineSetter__',
'message': 'Use Object.defineProperty',
},
{
'object': 'cr',
'property': 'exportPath',
'message': 'Use ES modules or cr.define() instead',
},
],
'no-restricted-syntax': ['error', {
'selector': 'CallExpression[callee.object.name=JSON][callee.property.name=parse] > CallExpression[callee.object.name=JSON][callee.property.name=stringify]',
'message': 'Don\'t use JSON.parse(JSON.stringify(...)) to clone objects. Use structuredClone() instead.',
},
{
// https://google.github.io/styleguide/tsguide.html#return-type-only-generics
'selector': 'TSAsExpression > CallExpression > MemberExpression[property.name=/^querySelector$/]',
'message': 'Don\'t use \'querySelector(...) as Type\'. Use the type parameter, \'querySelector<Type>(...)\' instead',
},
{
// https://google.github.io/styleguide/tsguide.html#return-type-only-generics
'selector': 'TSAsExpression > TSNonNullExpression > CallExpression > MemberExpression[property.name=/^querySelector$/]',
'message': 'Don\'t use \'querySelector(...)! as Type\'. Use the type parameter, \'querySelector<Type>(...)\', followed by an assertion instead',
},
{
// https://google.github.io/styleguide/tsguide.html#return-type-only-generics
'selector': 'TSAsExpression > CallExpression > MemberExpression[property.name=/^querySelectorAll$/]',
'message': 'Don\'t use \'querySelectorAll(...) as Type\'. Use the type parameter, \'querySelectorAll<Type>(...)\' instead',
},
{
// Prevent a common misuse of "!" operator.
"selector": "TSNonNullExpression > CallExpression > MemberExpression[property.name=/^querySelectorAll$/]",
"message": "Remove unnecessary \"!\" non-null operator after querySelectorAll(). It always returns a non-null result",
},
{
// https://google.github.io/styleguide/jsguide.html#es-module-imports
// 1) Matching only import URLs that have at least one '/' slash, to
// avoid false positives for NodeJS imports like
// `import fs from 'fs';`.
// Using '\u002F' instead of '/' as the suggested workaround for
// https://github.com/eslint/eslint/issues/16555
// 2) Allowing extensions that have a length between 2-4 characters
// (for example js, css, json)
"selector": "ImportDeclaration[source.value=/^.*\\u002F.*(?<!\\.[a-z]{2}|\\.[a-z]{3}|\\.[a-z]{4})$/]",
"message": "Disallowed extensionless import. Explicitly specify the extension suffix."
}],
'no-throw-literal': 'error',
'no-trailing-spaces': 'error',
'no-var': 'error',
'prefer-const': 'error',
'quotes': ['error', 'single', {allowTemplateLiterals: true}],
'semi': ['error', 'always'],
// https://google.github.io/styleguide/jsguide.html#features-one-variable-per-declaration
'one-var': ['error', {
let: 'never',
const: 'never',
}],
// TODO(dpapad): Add more checks according to our styleguide.
},
'overrides': [{
'files': ['**/*.ts'],
'parser': './third_party/node/node_modules/@typescript-eslint/parser/dist/index.js',
'plugins': [
'@typescript-eslint',
],
'rules': {
'no-unused-vars': 'off',
'@typescript-eslint/no-unused-vars': [
'error', {
argsIgnorePattern: '^_',
varsIgnorePattern: '^_',
}
],
// https://google.github.io/styleguide/tsguide.html#array-constructor
// Note: The rule below only partially enforces the styleguide, since it
// it does not flag invocations of the constructor with a single
// parameter.
'no-array-constructor': 'off',
'@typescript-eslint/no-array-constructor': 'error',
// https://google.github.io/styleguide/tsguide.html#automatic-semicolon-insertion
'semi': 'off',
'@typescript-eslint/semi': ['error'],
// https://google.github.io/styleguide/tsguide.html#arrayt-type
'@typescript-eslint/array-type': ['error', {
default: 'array-simple',
}],
// https://google.github.io/styleguide/tsguide.html#type-assertions-syntax
'@typescript-eslint/consistent-type-assertions': ['error', {
assertionStyle: 'as',
}],
// https://google.github.io/styleguide/tsguide.html#interfaces-vs-type-aliases
'@typescript-eslint/consistent-type-definitions': ['error', 'interface'],
// https://google.github.io/styleguide/tsguide.html#import-type
'@typescript-eslint/consistent-type-imports': 'error',
// https://google.github.io/styleguide/tsguide.html#visibility
'@typescript-eslint/explicit-member-accessibility': ['error', {
accessibility: 'no-public',
overrides: {
parameterProperties: 'off',
},
}],
// https://google.github.io/styleguide/jsguide.html#naming
'@typescript-eslint/naming-convention': [
'error',
{
selector: ['class', 'interface', 'typeAlias', 'enum', 'typeParameter'],
format: ['StrictPascalCase'],
filter: {
regex: '^(' +
// Exclude TypeScript defined interfaces HTMLElementTagNameMap
// and HTMLElementEventMap.
'HTMLElementTagNameMap|HTMLElementEventMap|' +
// Exclude native DOM types which are always named like HTML<Foo>Element.
'HTML[A-Za-z]{0,}Element|' +
// Exclude native DOM interfaces.
'UIEvent|UIEventInit|DOMError|' +
// Exclude the deprecated WebUIListenerBehavior interface.
'WebUIListenerBehavior)$',
match: false,
},
},
{
selector: 'enumMember',
format: ['UPPER_CASE'],
},
{
selector: 'classMethod',
format: ['strictCamelCase'],
modifiers: ['public'],
},
{
selector: 'classMethod',
format: ['strictCamelCase'],
modifiers: ['private'],
trailingUnderscore: 'allow',
// Disallow the 'Tap_' suffix, in favor of 'Click_' in event handlers.
// Note: Unfortunately this ESLint rule does not provide a way to
// customize the error message to better inform developers.
custom: {
regex: '^on[a-zA-Z0-9]+Tap$',
match: false,
},
},
{
selector: 'classProperty',
format: ['UPPER_CASE'],
modifiers: ['private', 'static', 'readonly'],
},
{
selector: 'classProperty',
format: ['UPPER_CASE'],
modifiers: ['public', 'static', 'readonly'],
},
{
selector: 'classProperty',
format: ['camelCase'],
modifiers: ['public'],
},
{
selector: 'classProperty',
format: ['camelCase'],
modifiers: ['private'],
trailingUnderscore: 'allow',
},
{
selector: 'parameter',
format: ['camelCase'],
leadingUnderscore: 'allow',
},
{
selector: 'function',
format: ['camelCase'],
},
],
// https://google.github.io/styleguide/tsguide.html#member-property-declarations
'@typescript-eslint/member-delimiter-style': ['error', {
multiline: {
delimiter: 'comma',
requireLast: true,
},
singleline: {
delimiter: 'comma',
requireLast: false,
},
overrides: {
interface: {
multiline: {
delimiter: 'semi',
requireLast: true,
},
singleline: {
delimiter: 'semi',
requireLast: false,
},
},
},
}],
// https://google.github.io/styleguide/tsguide.html#wrapper-types
'@typescript-eslint/ban-types': ['error', {
extendDefaults: false,
types: {
String: {
message: 'Use string instead',
fixWith: 'string',
},
Boolean: {
message: 'Use boolean instead',
fixWith: 'boolean',
},
Number: {
message: 'Use number instead',
fixWith: 'number',
},
Symbol: {
message: 'Use symbol instead',
fixWith: 'symbol',
},
BigInt: {
message: 'Use bigint instead',
fixWith: 'bigint',
},
}
}],
// https://google.github.io/styleguide/tsguide.html#ts-ignore
'@typescript-eslint/ban-ts-comment': ['error', {'ts-ignore': true}],
}
}]
};
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