Add test of yarn installation, and revert strip-comments version #2416
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R: @philipwalton
Fixes #2415
This adds a new test that tries to install our three
node
packages usingyarn
.yarn
is stricter aboutengines
versioning thannpm
is, so this will presumably catch some things that we wouldn't notice normally from just usingnpm
.This also reverts the version of
strip-comments
used byworkbox-build
to one that's compatible withnode
v8.(The Windows CI test suite currently uses the latest version of
node
, but the OS X test suite usesnode
v8.)