The next step in debugging our periodic rendering test failures is to use a new cache key. This change also removes the less specific key, so we will no longer get partial cache restores. If we don't see test failures after this change, we may try adding the v2-dependencies- as a key.
The transpiling step is done by babel instead of bublé now.
Bublé caused the istanbul instrumenter step to crash because of an
unexpected SourceMap object format.
