Support cacheDirctories
field in package.json
#742
Merged
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This PR reads
cacheDirectories
inpackage.json
if it exists and adds it to the build cache. This also adds a helper function to prevent duplicate cache directories. This is mainly for better compatibility with the Heroku Buildpack for Node.Most of the snapshot changes are just sorting differences, and the contents are actually the same (this is because we use a set to remove duplicates).