add yarn.lock

[viankakrisna]

I'm often cleaning my node_modules and reinstall it with yarn, and i notice that it always creates a new yarn.lock file. I think we should decide wether we want yarn.lock on the root of this project or not.

If we want to ignore it, i'll close this and do https://github.com/viankakrisna/create-react-app/tree/ignoreyarnlock instead.

[Timer]

This has been brought up before, I'm pretty sure the reasoning we haven't done it is that a yarn.lock isn't very portable cross-platform (because of optional deps, e.g. fsevents).

If we do anything, it'll probably be to ignore the lock files. It doesn't do us any good, we want to know when things break and they have no effect on the end-user when they install, so I think this will be a no go for now.

[viankakrisna]

Ok then, opened another PR for adding it to .gitignore. I've searched the repo and haven't found anything mentioning yarn.lock on the root of this project. Is there any particular issue / pr that brought this up?

[trygveaa]

This has been brought up before, I'm pretty sure the reasoning we haven't done it is that a yarn.lock isn't very portable cross-platform (because of optional deps, e.g. fsevents).

Seems like this has been fixed?
yarnpkg/yarn#2811

[gaearon]

See my comment in #2014 (comment).
We intentionally don't want to either add or ignore it in this repo.