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Caches the Yarn resolution for faster installs

Merged Administrator requested to merge github/fork/arcanis/cached-resolution into master

Created by: arcanis

When running create-react-app, a good chunk of the time is spent resolving the dependency tree to satisfying versions. Since react-scripts uses pinned dependencies anyway (suggesting that you always want to use precise versions), this looks a bit unnecessary.

This PR adds a new script, compile:lockfile, meant to be ran manually every now and then. It will update the yarn.lock.cached file located in the create-react-app package, which will be copied into the app directory before running yarn add react-scripts (only if Yarn is being used, of course). Three cases then:

  • If create-react-app is up-to-date with the latest react-scripts, the resolution will be mostly instantaneous.
  • If create-react-app is completely desynchronized with the react-scripts being used, the resolution will be like now (the cached resolution will simply be ignored by Yarn).
  • If create-react-app is old-but-not-that-much compared to react-scripts, Yarn will be able to reuse at least some of the cached resolution, which will still give a perf boost.