Ignore files in jest watch mode

[kumar303]

Do you want to request a feature or report a bug?

feature

What is the current behavior?

When I run jest --watch it watches all files and re-runs the tests when one of them changes.

What is the expected behavior?

This works as expected except when we use a webpack plugin that generates a webpack-assets.json file periodically. After editing a code file, the auto-generated assets file causes the tests to run twice which is slower than it needs to be.

It would be really helpful if I could configure the jest watcher to ignore changes to the webpack-assets.json file.

Please provide your exact Jest configuration and mention your Jest, node, yarn/npm version and operating system.

$ jest --version
v20.0.4

$ yarn --version
0.24.6

$ node --version
v6.10.3

$ watchman --version
4.7.0

Mac OS X 10.12.5

I know that #2516 was fixed but that solved it for code coverage only. It would be great to have a generic solution to this where we could just ignore files based on a list of patterns.

Jest config

module.exports = {
  collectCoverageFrom: ['src/**/*.{js,jsx}'],
  coveragePathIgnorePatterns: [
    '<rootDir>/node_modules/',
    '<rootDir>/src/core/server/webpack-isomorphic-tools-config.js',
    '<rootDir>/src/locale/',
  ],
  moduleDirectories: [
    'src',
    'node_modules',
  ],
  moduleFileExtensions: [
    'js',
    'json',
    'jsx',
  ],
  moduleNameMapper: {
    // Prevent un-transpiled react-photoswipe code being required.
    '^photoswipe$': '<rootDir>/node_modules/photoswipe',
    // Use the client-side logger by default for tests.
    '^core/logger$': '<rootDir>/src/core/client/logger',
    // Alias tests for tests to be able to import helpers.
    '^tests/(.*)$': '<rootDir>/tests/$1',
    // Replaces the following formats with an empty module.
    '^.+\\.(scss|css|svg|woff|woff2|mp4|webm)$': '<rootDir>/tests/emptyModule',
  },
  setupTestFrameworkScriptFile: '<rootDir>/tests/setup.js',
  testPathIgnorePatterns: [
    '<rootDir>/node_modules/',
    '<rootDir>/(assets|bin|config|coverage|dist|docs|flow|locale|src)/',
  ],
  testMatch: [
    '**/[Tt]est(*).js?(x)',
    '**/__tests__/**/*.js?(x)',
  ],
  transform: {
    '^.+\\.js$': 'babel-jest',
    // This transforms images to be a module that exports the filename.
    // Tests can assert on the filenname.
    '^.+\\.(jpg|jpeg|gif|png)$': '<rootDir>/tests/fileTransformer',
  },
  transformIgnorePatterns: [
    '<rootDir>/node_modules/',
  ],
  verbose: false,
};

[rogeliog]

Have you can tried adding the file to the testPathIgnorePatterns http://facebook.github.io/jest/docs/configuration.html#testpathignorepatterns-array-string

[kumar303]

I did try that but as far as I could tell it didn't affect the watcher

[Fr33maan]

+1

[aisensiy]

+1

[tricoder42]

Looking at source of jest-cli/watch.js, filtering (in SearchSource) is applied after watcher decides if any file was changed or not.

Trying to fix it in PR. Please correct me if I'm wrong.

[aisensiy]

#4331
Add a new argument to add ignore files in watch mode.

[github-actions]

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