Yarn is good. Yarn works.
Make Yarn the default, drop default vendor/asset directories
FWIW we had some issues with yarn at Shopify where they shipped a few fully broken releases and pulled production versions in the last couple weeks. We had to pin the version at 0.16 and are carefully testing the newest one to make sure it doesn't break on us before rolling it out to all developers. 0.17 perhaps was just an anomaly, but it might make sense to wait a month or two to let it stabilize a bit before endorsing it for the whole Rails community.
Waiting two more months will double the time it's been in the wild and it doesn't seem like there is much urgency.
@airhorns I think we will have plenty time to test this between now and the first betas of Rails 5.1, I don't think we have a ETA for 5.1 beta yet but I'm pretty sure it won't be released in the next 3 or 4 months.
if configuration bit could be in rails app config itself and assets precompile could indirectly run yarn that would be great
Why is it ./vendor/package.json but not ./package.json? It looks like the thing of the same kind as Gemfile and should probably be placed at root too.
@bogdan That was hashed out on a separate issue/thread. @dhh mentioned he thought Gemfile could eventually be moved to /vendor as well.