.eslintrc.js

module.exports = {
  extends: [
    'airbnb',
    'airbnb/hooks',
    'plugin:@typescript-eslint/recommended',
    'plugin:jest/recommended',
    'plugin:promise/recommended',
    'plugin:compat/recommended',
    'plugin:prettier/recommended',
  ],
  env: {
    browser: true,
    node: true,
  },
  parser: '@typescript-eslint/parser',
  parserOptions: {
    ecmaVersion: 2020,
    sourceType: 'module',
    tsconfigRootDir: __dirname,
    createDefaultProgram: true,
  },
  settings: {
    'import/resolver': {
      // See https://github.com/benmosher/eslint-plugin-import/issues/1396#issuecomment-575727774 for line below
      node: {},
      webpack: {
        config: require.resolve('./.erb/configs/webpack.config.eslint.ts'),
      },
      typescript: {},
    },
    'import/parsers': {
      '@typescript-eslint/parser': ['.ts', '.tsx'],
    },
  },
  rules: {
    'prettier/prettier': [
      'error',
      {
        printWidth: 100,
        tabWidth: 2,
        bracketSpacing: true,
        singleQuote: true,
        trailingComma: 'es5',
      },
    ],
    // A temporary hack related to IDE not resolving correct package.json
    'import/no-extraneous-dependencies': 'off',
    'import/no-unresolved': 'error',
    // Since React 17 and typescript 4.1 you can safely disable the rule
    'react/react-in-jsx-scope': 'off',
    'import/extensions': 'off',
    'import/no-import-module-exports': 'off',
    'react/function-component-definition': 'off',
    'react/default-props-match-prop-types': 'off',
    'react/no-array-index-key': 'off',
    'react/jsx-props-no-spreading': 'off',
    'react/jsx-filename-extension': 'off',
    '@typescript-eslint/no-unused-vars': [
      'warn', // or error
      {
        argsIgnorePattern: '^_',
        varsIgnorePattern: '^_',
        caughtErrorsIgnorePattern: '^_',
      },
    ],
    'no-shadow': 'off',
    '@typescript-eslint/no-shadow': 'error',
    '@typescript-eslint/explicit-function-return-type': 'off',
    '@typescript-eslint/explicit-module-boundary-types': 'off',
    '@typescript-eslint/no-var-requires': 'off',
    '@typescript-eslint/no-unsafe-declaration-merging': 'off', // temporary fix for EventEmitter & EventTarget
    'no-param-reassign': ['error', { props: false }],
    // Useless rules
    'import/prefer-default-export': 'off',
    'class-methods-use-this': 'off',
    'promise/always-return': 'off',
    'no-restricted-exports': 'off',
  },
  overrides: [
    {
      files: ['chords-data.ts'],
      rules: {
        'prettier/prettier': [
          'error',
          {
            printWidth: 1000,
            tabWidth: 2,
            bracketSpacing: true,
            singleQuote: true,
            trailingComma: 'es5',
          },
        ],
      },
    },
  ],
};