front_end/.eslintrc.js

// 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.

const path = require('path');
const rulesDirPlugin = require('eslint-plugin-rulesdir');
rulesDirPlugin.RULES_DIR = path.join(__dirname, '..', 'scripts', 'eslint_rules', 'lib');

module.exports = {
  'rules': {
    // L10n rules are only relevant in 'front_end'.
    'rulesdir/l10n_filename_matches': 2,
    'rulesdir/l10n_no_i18nString_calls_module_instantiation': 2,
    'rulesdir/l10n_no_locked_or_placeholder_only_phrase': 2,
    'rulesdir/l10n_no_uistrings_export': 2,
    'rulesdir/l10n_no_unused_message': 2,
    'rulesdir/custom_element_definitions_location': 2,
    'rulesdir/custom_element_component_definition': 2,
  },
  'overrides': [
    {
      'files': ['*.ts'],
      'rules': {
        '@typescript-eslint/explicit-function-return-type': 2,
        'rulesdir/enforce_custom_event_names': 2,
        'rulesdir/set_data_type_reference': 2,
        'rulesdir/lit_html_data_as_type': 2,
        'rulesdir/lit_no_style_interpolation': 2,
        'rulesdir/ban_literal_devtools_component_tag_names': 2,
        'rulesdir/ban_self_closing_custom_element_tagnames': 2,
        'rulesdir/check_component_naming': 2,
        '@typescript-eslint/naming-convention': [
          'error', {
            'selector': ['property', 'parameterProperty'],
            'format': ['camelCase'],
          },
          {
            'selector': 'property',
            'modifiers': ['public'],
            'format': ['camelCase'],
            'leadingUnderscore': 'allow',
          },
          {
            'selector': 'classProperty',
            'modifiers': ['static', 'readonly'],
            'format': ['UPPER_CASE'],
          },
          {
            'selector': 'method',
            'format': ['camelCase'],
          },
          {
            'selector': 'function',
            'format': ['camelCase'],
          },
          {
            'selector': 'variable',
            'filter': {
              // Ignore localization variables.
              'regex': '^(UIStrings|str_)$',
              'match': false
            },
            'format': ['camelCase'],
          },
          {
            // We are using camelCase, PascalCase and UPPER_CASE for top-level constants, allow the for now.
            'selector': 'variable',
            'modifiers': ['const'],
            'filter': {
              // Ignore localization variables.
              'regex': '^(UIStrings|str_)$',
              'match': false
            },
            'format': ['camelCase', 'UPPER_CASE', 'PascalCase'],
          },
          {
            // Public methods are currently in transition and may still have leading underscores.
            'selector': 'method',
            'modifiers': ['public'],
            'format': ['camelCase'],
            'leadingUnderscore': 'allow',
          },
          {
            // Object literals may be constructed as arguments to external libraries which follow different styles.
            'selector': ['objectLiteralMethod', 'objectLiteralProperty'],
            'modifiers': ['public'],
            'format': null,
          },
          {
            'selector': 'accessor',
            'format': ['camelCase'],
          },
          {
            'selector': 'enumMember',
            'format': ['PascalCase', 'UPPER_CASE'],
          },
          {
            'selector': ['typeLike'],
            'format': ['PascalCase'],
          },
          {
            'selector': 'parameter',
            'format': ['camelCase'],
            'leadingUnderscore': 'allow',
          }
        ]
      }
    },
    {
      'files': ['*-meta.ts'],
      'rules': {
        '@typescript-eslint/naming-convention': [
          'error', {
            'selector': 'parameter',
            'format': ['camelCase', 'PascalCase'],
            'leadingUnderscore': 'allow',
          }
        ]
      }
    }
  ]
};