.eslintrc.js

const path = require('path');

module.exports = {
  env: {
    es6: true,
    browser: true,
    node: true,
  },

  parserOptions: {
    sourceType: 'module',
    ecmaFeatures: {
      jsx: true,
    },
  },

  extends: ['eslint-config-prettier'],

  plugins: [
    'babel',
    'eslint-comments',
    'import',
    'prettier',
    'simple-import-sort',
  ],

  rules: {
    'array-callback-return': 'error',
    'babel/no-invalid-this': 'error',
    'babel/valid-typeof': 'error',
    'constructor-super': 'error',
    'default-case': ['error', { commentPattern: '^no default$' }],
    'eslint-comments/disable-enable-pair': ['error', { allowWholeFile: true }],
    'eslint-comments/no-aggregating-enable': 'error',
    'eslint-comments/no-duplicate-disable': 'error',
    'eslint-comments/no-unlimited-disable': 'error',
    'eslint-comments/no-unused-disable': 'error',
    'eslint-comments/no-unused-enable': 'error',
    'for-direction': 'error',
    'getter-return': 'error',
    'import/export': 'error',
    'import/extensions': 'off',
    'import/imports-first': 'error',
    'import/named': 'off',
    'import/no-amd': 'error',
    'import/no-commonjs': 'error',
    'import/no-duplicates': 'error',
    'import/no-extraneous-dependencies': 'error',
    'import/no-self-import': 'error',
    'new-parens': 'error',
    'no-array-constructor': 'error',
    'no-caller': 'error',
    'no-case-declarations': 'error',
    'no-class-assign': 'error',
    'no-compare-neg-zero': 'error',
    'no-cond-assign': ['error', 'except-parens'],
    'no-const-assign': 'error',
    'no-constant-condition': 'error',
    'no-control-regex': 'error',
    'no-delete-var': 'error',
    'no-dupe-args': 'error',
    'no-dupe-class-members': 'error',
    'no-dupe-keys': 'error',
    'no-duplicate-case': 'error',
    'no-empty': 'error',
    'no-empty-character-class': 'error',
    'no-empty-pattern': 'error',
    'no-eval': 'error',
    'no-ex-assign': 'error',
    'no-extend-native': 'error',
    'no-extra-bind': 'error',
    'no-extra-boolean-cast': 'error',
    'no-extra-label': 'error',
    'no-extra-semi': 'error',
    'no-fallthrough': 'error',
    'no-func-assign': 'error',
    'no-global-assign': 'error',
    'no-implied-eval': 'error',
    'no-inner-declarations': 'error',
    'no-invalid-regexp': 'error',
    'no-iterator': 'error',
    'no-label-var': 'error',
    'no-labels': ['error', { allowLoop: true, allowSwitch: false }],
    'no-lone-blocks': 'error',
    'no-loop-func': 'error',
    'no-misleading-character-class': 'error',
    'no-multi-str': 'error',
    'no-new-func': 'error',
    'no-new-object': 'error',
    'no-new-symbol': 'error',
    'no-new-wrappers': 'error',
    'no-obj-calls': 'error',
    'no-octal': 'error',
    'no-octal-escape': 'error',
    'no-redeclare': 'error',
    'no-regex-spaces': 'error',
    'no-self-assign': 'error',
    'no-self-compare': 'error',
    'no-shadow-restricted-names': 'error',
    'no-sparse-arrays': 'error',
    'no-this-before-super': 'error',
    'no-throw-literal': 'error',
    'no-undef': 'error',
    'no-unexpected-multiline': 'error',
    'no-unreachable': 'error',
    'no-unsafe-finally': 'error',
    'no-unsafe-negation': 'error',
    'no-unused-labels': 'error',
    'no-unused-vars': 'error',
    'no-use-before-define': [
      'error',
      { functions: false, classes: false, variables: false },
    ],
    'no-useless-computed-key': 'error',
    'no-useless-concat': 'error',
    'no-useless-constructor': 'error',
    'no-useless-escape': 'error',
    'no-useless-rename': 'error',
    'no-with': 'error',
    'require-yield': 'error',
    'simple-import-sort/exports': 'error',
    'unicode-bom': 'error',
    'use-isnan': 'error',
    eqeqeq: ['error', 'smart'],

    'import/no-unresolved': [
      'error',
      { caseSensitive: false, ignore: ['vscode'] },
    ],
    'prettier/prettier': [
      'error',
      {
        bracketSameLine: false,
        bracketSpacing: true,
        printWidth: 80,
        semi: true,
        singleQuote: true,
        tabWidth: 2,
        trailingComma: 'all',
        useTabs: false,
        endOfLine: 'auto',
      },
    ],
    'simple-import-sort/imports': [
      'error',
      { groups: [['^\\u0000'], ['^@?\\w'], ['^~/'], ['^../'], ['^./']] },
    ],
  },
  overrides: [
    {
      files: ['*.ts', '*.tsx'],
      parser: require.resolve('@typescript-eslint/parser'),
      plugins: ['@typescript-eslint/eslint-plugin'],
      settings: {
        'import/extensions': ['.js', '.ts', '.tsx'],
        'import/parsers': {
          '@typescript-eslint/parser': ['.ts', '.tsx'],
        },
        'import/resolver': {
          node: {
            extensions: ['.js', '.ts', '.tsx'],
          },
        },
      },
      rules: {
        '@typescript-eslint/adjacent-overload-signatures': 'error',
        '@typescript-eslint/array-type': 'error',
        '@typescript-eslint/consistent-type-assertions': [
          'error',
          { assertionStyle: 'as' },
        ],
        '@typescript-eslint/member-delimiter-style': 'error',
        '@typescript-eslint/no-array-constructor': 'error',
        '@typescript-eslint/no-dynamic-delete': 'error',
        '@typescript-eslint/no-empty-interface': [
          'error',
          { allowSingleExtends: true },
        ],
        '@typescript-eslint/no-extra-non-null-assertion': 'error',
        '@typescript-eslint/no-extraneous-class': 'error',
        '@typescript-eslint/no-misused-new': 'error',
        '@typescript-eslint/no-namespace': 'error',
        '@typescript-eslint/no-unused-vars': [
          'error',
          { argsIgnorePattern: '^_' },
        ],
        '@typescript-eslint/no-use-before-define': [
          'error',
          {
            functions: false,
            classes: false,
            variables: false,
            typedefs: false,
          },
        ],
        '@typescript-eslint/no-useless-constructor': 'error',
        '@typescript-eslint/prefer-for-of': 'error',
        '@typescript-eslint/prefer-function-type': 'error',
        '@typescript-eslint/prefer-namespace-keyword': 'error',
        '@typescript-eslint/prefer-optional-chain': 'error',
        '@typescript-eslint/triple-slash-reference': 'error',
        '@typescript-eslint/unified-signatures': 'error',
        'default-case': 'off',
        'no-dupe-class-members': 'off',
        'no-undef': 'off',
        'no-unused-vars': 'off',
        'no-array-constructor': 'off',
        'no-use-before-define': 'off',
      },
    },
    {
      plugins: ['jest'],
      files: ['*.{spec,test}.{js,ts,tsx}', '**/__tests__/**/*.{js,ts,tsx}'],
      env: {
        jest: true,
      },
      rules: {
        'import/no-extraneous-dependencies': [
          'error',
          { devDependencies: true },
        ],
        'jest/consistent-test-it': ['error', { fn: 'test' }],
        'jest/expect-expect': [
          'error',
          { assertFunctionNames: ['expect', 'element'] },
        ],
        'jest/no-disabled-tests': 'error',
        'jest/no-duplicate-hooks': 'error',
        'jest/no-export': 'error',
        'jest/no-focused-tests': 'error',
        'jest/no-identical-title': 'error',
        'jest/no-jasmine-globals': 'error',
        'jest/no-test-prefixes': 'error',
        'jest/no-test-return-statement': 'error',
        'jest/prefer-todo': 'error',
        'jest/require-to-throw-message': 'error',
        'jest/valid-describe-callback': 'error',
        'jest/valid-expect-in-promise': 'error',
        'jest/valid-expect': 'error',
        'jest/valid-title': 'error',
        'jest/no-restricted-matchers': [
          'error',
          {
            toBeTruthy: 'Avoid `toBeTruthy`',
            toBeFalsy: 'Avoid `toBeFalsy`',
          },
        ],
      },
    },
    {
      files: ['*.js'],
      parser: require.resolve('@babel/eslint-parser'),
      parserOptions: {
        requireConfigFile: false,
      },
      rules: {
        'import/default': 'error',
        'import/namespace': 'error',
        'import/no-named-as-default': 'error',
        'import/no-named-as-default-member': 'error',
        'import/no-cycle': 'error',
        'import/no-deprecated': 'error',
      },
    },
    {
      files: ['*.config.js', '.*rc.js'],
      env: {
        node: true,
      },
      rules: {
        'import/no-commonjs': 'off',
        'import/no-extraneous-dependencies': [
          'error',
          { devDependencies: true },
        ],
      },
    },
  ],
  globals: {
    jasmine: true,
  },
};