Watch and rerun Jest JS tests

If you have npm test configured, you can just run npm test -- --watch.

Thanks to Erin Stanfill for pointing out, Jest already has support for automatically re-running. The better configuration for package.json would be

{
  "scripts": {
    "test": "jest"
  }
}

To turn on the watch mode, just use

$ npm run test -- --watch

$ yarn run test --watch

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