Replace NPM use by Yarn

Basically, after a quick test done by @rochoa, we checked that installing our dependencies took 30 seconds with yarn instead of ~120 using NPM. Why? Yarn is faster because it uses parallelization and caches every package. Also it uses its own “shrinkwrap”, called yarn.lock.

• Replace use of NPM and start using Yarn in:
  • CI tests.
  • Development environment: basically checks our grunt tasks.
  • Staging environment: check deploys are correct, basically the grunt build task.
• Change all documentation, like CONTRIBUTING.
• Compare results from old (npm) to new (yarn).
• Migrate duplicated dependencies checker to new Yarn.lock*.

*About last bullet: we have a “checker” made by @rochoa and @javisantana (if I’m not wrong), where we check if the same dependency is used in other place with a different version. So, we should keep this checker but using the new yarn.lock file instead of the npm-shrinkwrap.json.

[jvillarf]

@ivanmalagon we have finally released the new onprem version, so this is no longer a blocker. Thanks for waiting for us.

[ivanmalagon]

We were waiting for OnPremises 2.2 to be officially released. We didn’t want to mess anything. OP 2.2 is still pending so this in on hold.