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POC of providing a watching build mode that writes to the disk in development

Closed Administrator requested to merge github/fork/viankakrisna/watch into master

Created by: viankakrisna

POC for https://github.com/facebookincubator/create-react-app/issues/1070

  • Watching build mode by running npm run watch
  • Add react-scripts/scripts/watch.js and react-scripts/config/webpack.config.watch.js
  • Add prefix to the generated build files so we know that it's a development build. example: development.main.hash321.js
  • Cleans the build folder every compile, if the asset hash changed. So we don't end up with stale files in there. using packages/react-dev-utils/cleanBuildFolder.js
  • Prompts if the use case for using this mode is fulfilled at the start of the script, so the user won't accidentally using this mode if what they building doesn't need it.