jest.js

const readPkgUp = require('read-pkg-up')

const {disableRules, mapDeprecatedRules} = require('./utils')

let hasJestDom = false
let hasTestingLibrary = false

try {
  const {packageJson} = readPkgUp.sync({normalize: true})
  const allDeps = Object.keys({
    ...packageJson.peerDependencies,
    ...packageJson.devDependencies,
    ...packageJson.dependencies,
  })

  hasJestDom = allDeps.includes('@testing-library/jest-dom')
  hasTestingLibrary = [
    '@testing-library/dom',
    '@testing-library/react',
    '@testing-library/angular',
    '@testing-library/vue',
  ].some(dependency => allDeps.includes(dependency))
} catch (error) {
  // ignore error
}

const rules = {
  'react/display-name': 'off', // we don't need a display name in test files

  ...mapDeprecatedRules(['jest/no-expect-resolves']),
  'jest/consistent-test-it': 'off',
  'jest/expect-expect': 'off',
  'jest/lowercase-name': 'off',
  'jest/max-nested-describe': 'error',
  'jest/no-alias-methods': 'off',
  'jest/no-commented-out-tests': 'warn',
  'jest/no-conditional-expect': 'error',
  'jest/no-deprecated-functions': 'error',
  'jest/no-disabled-tests': 'warn',
  'jest/no-done-callback': 'error',
  'jest/no-duplicate-hooks': 'off',
  'jest/no-export': 'error',
  'jest/no-focused-tests': 'error',
  'jest/no-hooks': 'off',
  'jest/no-identical-title': 'error',
  'jest/no-if': 'error',
  'jest/no-interpolation-in-snapshots': 'error',
  'jest/no-jasmine-globals': 'off',
  'jest/no-jest-import': 'error',
  'jest/no-large-snapshots': ['warn', {maxSize: 300}],
  'jest/no-mocks-import': 'error',
  'jest/no-restricted-matchers': 'off',
  'jest/no-standalone-expect': 'off',
  'jest/no-test-prefixes': 'error',
  'jest/no-test-return-statement': 'off',
  'jest/no-truthy-falsy': 'off',
  'jest/no-try-expect': 'error',
  'jest/prefer-called-with': 'error',
  'jest/prefer-expect-assertions': 'off',
  'jest/prefer-hooks-on-top': 'error',
  'jest/prefer-inline-snapshots': 'off',
  'jest/prefer-spy-on': 'off',
  'jest/prefer-strict-equal': 'off',
  'jest/prefer-to-be-null': 'off',
  'jest/prefer-to-be-undefined': 'off',
  'jest/prefer-to-contain': 'warn',
  'jest/prefer-to-have-length': 'warn',
  'jest/prefer-todo': 'warn',
  'jest/require-to-throw-message': 'off',
  'jest/require-top-level-describe': 'off',
  'jest/unbound-method': 'off',
  'jest/valid-describe': 'error',
  'jest/valid-expect': 'error',
  'jest/valid-expect-in-promise': 'error',
  'jest/valid-title': 'warn',

  ...(hasJestDom
    ? {
        'jest-dom/prefer-checked': 'error',
        'jest-dom/prefer-in-document': 'error',
        'jest-dom/prefer-empty': 'error',
        'jest-dom/prefer-enabled-disabled': 'error',
        'jest-dom/prefer-focus': 'error',
        'jest-dom/prefer-required': 'error',
        'jest-dom/prefer-to-have-attribute': 'error',
        'jest-dom/prefer-to-have-style': 'error',
        'jest-dom/prefer-to-have-text-content': 'error',
        'jest-dom/prefer-to-have-value': 'error',
        'jest-dom/prefer-to-have-class': 'error',
      }
    : null),

  ...(hasTestingLibrary
    ? {
        'testing-library/await-async-query': 'error',
        'testing-library/await-async-utils': 'error',
        'testing-library/await-fire-event': 'off',
        'testing-library/consistent-data-testid': 'off',
        'testing-library/no-await-sync-events': 'error',
        'testing-library/no-await-sync-query': 'error',
        'testing-library/no-container': 'error',
        'testing-library/no-debugging-utils': 'error',
        'testing-library/no-dom-import': ['error', 'react'],
        'testing-library/no-manual-cleanup': 'error',
        'testing-library/no-node-access': 'error',
        'testing-library/no-promise-in-fire-event': 'error',
        'testing-library/no-render-in-setup': 'error',
        'testing-library/no-unnecessary-act': 'error',
        'testing-library/no-wait-for-empty-callback': 'error',
        'testing-library/no-wait-for-multiple-assertions': 'error',
        'testing-library/no-wait-for-side-effects': 'error',
        'testing-library/no-wait-for-snapshot': 'error',
        'testing-library/prefer-explicit-assert': 'warn',
        'testing-library/prefer-find-by': 'error',
        'testing-library/prefer-presence-queries': 'error',
        'testing-library/prefer-query-by-disappearance': 'error',
        'testing-library/prefer-screen-queries': 'error',
        'testing-library/prefer-user-event': 'error',
        'testing-library/prefer-wait-for': 'error',
        'testing-library/render-result-naming-convention': 'error',
      }
    : null),
}

module.exports = {
  env: {
    'jest/globals': true,
  },
  plugins: [
    'jest',
    hasJestDom ? 'jest-dom' : null,
    hasTestingLibrary ? 'testing-library' : null,
  ].filter(Boolean),
  rules: {
    // Workaround until `eslint-find-rules` supports 'overrides'
    // See https://github.com/sarbbottam/eslint-find-rules/issues/317
    ...disableRules(Object.keys(rules)),
  },
  overrides: [
    {
      files: [
        '**/__tests__/**/*.+(js|ts)?(x)',
        '**/*.{spec,test}.+(js|ts)?(x)',
      ],
      rules,
    },
    {
      files: ['**/__tests__/**/*.ts?(x)', '**/*.{spec,test}.ts?(x)'],
      rules: {
        '@typescript-eslint/unbound-method': 'off',
        'jest/unbound-method': 'error',
      },
    },
  ],
}