[Suggestion] use yarn instead of npm for performance/reliability

[dylanh724]

Just a suggestion -- it's ultimately still npm in the background:

https://www.sitepoint.com/yarn-vs-npm/

[clydin]

See #2651.
It can be used right now with --skip-npm and then running yarn.
Also, beyond use of the registry yarn is not just npm in the background.

[Splaktar]

Yep, this duplicate issue should be closed.

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