Awesome

jest-watch-exec

Execute commands on start or when the all tests pass.

Requires jest@23+.

Usage

To use jest-watch-exec, add it to the watchPlugins section of the Jest configuration:

{
  "jest": {
    "watchPlugins": [
      ["jest-watch-exec", { "on-start": "npm run build" }],
      ["jest-watch-exec", { "on-start-script": "somescript.js" }],
      // Will run the `run(): boolean | Promise<boolean>` method exposed by the module
      ["jest-watch-exec", { "on-start-module": "modulescript.js" }],
      // Will run test even if on-start | on-start-script | on-start-module fails.
      ["jest-watch-exec", { "on-start-ignore-error": true, ... }],
      // execute script when there are passing tests.
      // will not execute if the tests are filtered.
      ["jest-watch-exec", { "on-pass": "npm run build" }],
      // execute 'on-pass' even the tests are filtered.
      ["jest-watch-exec", { "on-pass": "npm run build", "exec-while-filtered": true }]
    ]
  }
}

• on-start-ignore-error: The script is considered failed if it:
  • returns a falsy value,
  • throws an error,
  • returns a promise resolves to false, or
  • returns a rejected promise.

Contribute

# after fork and clone
npm install

# begin making changes
git checkout -b <branch>
npm run watch

# after making change(s)
git commit -m "<commit message>"
git push

# create PR