eslint.config.js

const eslint = require('@eslint/js');
const eslintPluginSvelte = require('eslint-plugin-svelte');
const { fixupPluginRules } = require('@eslint/compat');
const headers = require('eslint-plugin-headers');
const eslintPluginPrettierRecommended = require('eslint-plugin-prettier/recommended');
const rxjs = require('eslint-plugin-rxjs');
const tseslint = require('typescript-eslint');

module.exports = tseslint.config(
  eslint.configs.recommended,
  ...tseslint.configs.recommended,
  eslintPluginPrettierRecommended,
  {
    ignores: [
      '**/build/*',
      '**/.svelte-kit/*',
      '**/service-worker.ts',
      '**/postcss.config.cjs',
      '**/.prettierrc.cjs',
      '**/material-elevation.cjs',
      '**/vite.config.js',
      '**/eslint.config.js',
      '**/tailwind.config.cjs'
    ]
  },
  {
    languageOptions: {
      parserOptions: {
        parser: '@typescript-eslint/parser',
        ecmaVersion: 2020,
        extraFileExtensions: ['.svelte'],
        project: './tsconfig.eslint.json',
        sourceType: 'module',
        tsconfigRootDir: './apps/web/'
      }
    },
    name: 'root',
    plugins: {
      headers,
      rxjs: fixupPluginRules(rxjs)
    },
    rules: {
      'no-return-assign': ['error', 'except-parens'],
      'no-underscore-dangle': 'off',
      '@typescript-eslint/no-use-before-define': 'off',
      '@typescript-eslint/no-explicit-any': 'off',
      'prettier/prettier': [
        'error',
        {
          endOfLine: 'auto'
        }
      ]
    }
  },
  {
    files: ['**/!(*.d).ts'],
    rules: {
      '@typescript-eslint/no-unused-vars': [
        'error',
        { argsIgnorePattern: '^_', varsIgnorePattern: '^_', caughtErrorsIgnorePattern: '^_' }
      ],
      'headers/header-format': [
        'error',
        {
          content: `@license BSD-3-Clause\nCopyright (c) {year}, ッツ Reader Authors\nAll rights reserved.`,
          source: 'string',
          style: 'jsdoc',
          trailingNewlines: 2,
          preservePragmas: false,
          variables: {
            year: `${new Date().getFullYear()}`
          }
        }
      ]
    }
  },
  {
    ...eslintPluginSvelte.configs['flat/recommended'],
    files: ['*.svelte'],
    languageOptions: {
      parserOptions: { parser: '@typescript-eslint/parser' }
    },
    rules: {
      'except-parens': 'off',
      quotes: ['error', 'single', { avoidEscape: true, allowTemplateLiterals: true }]
    }
  },
  {
    files: ['service-worker.ts'],
    rules: {
      'headers/header-format': 'off'
    }
  }
);