.eslintrc.js

module.exports = {
  extends: [
    'airbnb',
    'prettier',
    'plugin:@typescript-eslint/eslint-recommended',
    'plugin:@typescript-eslint/recommended',
    'plugin:import/typescript',
  ],
  parser: '@typescript-eslint/parser',
  plugins: ['prettier', 'react-hooks', '@typescript-eslint'],
  root: true,
  rules: {
    'prettier/prettier': 'error',
    'react/jsx-filename-extension': 0,
    'react/jsx-one-expression-per-line': 0,
    'react/no-unescaped-entities': 0,
    'react/prop-types': 0,
    'jsx-a11y/anchor-is-valid': 0, // https://github.com/zeit/next.js/issues/5533
    // The jsx-wrap-multilines rule conflicts with Prettier.
    // https://github.com/prettier/prettier/issues/1009#issuecomment-286993938
    'react/jsx-wrap-multilines': [
      'error',
      {
        declaration: false,
        assignment: false,
      },
    ],
    'react-hooks/rules-of-hooks': 'error',
    'react-hooks/exhaustive-deps': 'error',
    'react/function-component-definition': [
      2,
      {
        namedComponents: 'arrow-function',
        unnamedComponents: 'arrow-function',
      },
    ],
    // https://github.com/typescript-eslint/typescript-eslint/blob/master/docs/getting-started/linting/FAQ.md#i-am-using-a-rule-from-eslint-core-and-it-doesnt-work-correctly-with-typescript-code
    'no-shadow': 0,
    '@typescript-eslint/no-shadow': 'error',
    // https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/no-use-before-defsine.md
    'no-use-before-define': 'off',
    '@typescript-eslint/no-use-before-define': ['error'],
    // Let eslint manage semicolons
    '@typescript-eslint/no-extra-semi': 0,
    'import/no-unresolved': 'error',
    'import/prefer-default-export': 0,
    'import/extensions': [
      'error',
      'ignorePackages',
      {
        js: 'never',
        jsx: 'never',
        ts: 'never',
        tsx: 'never',
      },
    ],
    'react/require-default-props': 'off',
  },
  overrides: [
    // Set Jest rules only for test files.
    // https://stackoverflow.com/a/49211283
    {
      files: [
        '**/*.test.ts',
        '**/*.test.tsx',
        '**/__mocks__/**/*.ts',
        '**/__mocks__/**/*.tsx',
        '**/*.test.js',
        '**/*.test.jsx',
        '**/__mocks__/**/*.js',
        '**/__mocks__/**/*.jsx',
      ],
      extends: ['plugin:jest/recommended'],
      env: {
        jest: true,
      },
      plugins: ['jest'],
      rules: {
        'global-require': 0,
        'react/jsx-props-no-spreading': 0,
        '@typescript-eslint/no-var-requires': 0,
        '@typescript-eslint/no-empty-function': 0,
      },
    },
    {
      files: ['./codemod/**'],
      rules: {
        'import/no-extraneous-dependencies': 0,
        '@typescript-eslint/no-var-requires': 0,
      },
    },
    {
      files: ['./codemod/**/*.fixtures/*'],
      rules: {
        '@typescript-eslint/no-unused-vars': 0,
      },
    },
    {
      files: ['index.tests.ts'],
      rules: {
        '@typescript-eslint/no-unused-vars': 'off',
      },
    },
  ],
  parserOptions: {
    ecmaVersion: 2018,
    sourceType: 'module',
  },
  env: {
    es6: true,
  },
  globals: {
    // Polyfilled in Next.js 9.4. Set as a Webpack external.
    fetch: 'writable',
  },
  settings: {
    // Handle linting for absolute imports.
    'import/parsers': {
      '@typescript-eslint/parser': ['.ts', '.tsx'],
    },
    'import/resolver': {
      typescript: {
        alwaysTryTypes: true,
      },
      node: true,
    },
  },
}