Detect when yarn is hanging, waiting for input

[sandorfr]

When there is no lockfile, yarn might be hanging waiting for user input. While this is not strictly a but, we need to find a way to detect that and report an error accordingly.

[sandorfr]

Interessant insights about this can be found here:
yarnpkg/yarn#1658

And there is a solution to explorer here:
https://gist.github.com/ds300/158250f230d1825af8a3edd6e7af9cc0

[sandorfr]

The solution appears to be much simple, there is an undocumented feature : yarnpkg/yarn#3521 (comment)

[sandorfr]

Waiting for yarnpkg/yarn#5002 and yarnpkg/yarn#3450 resolution and will include this flag by default.