A package that contains checks that npm runs during the installation.
Check if node/npm version is supported by the package. If not
strict and it isn't supported, cb
is called with the error
object as its second argument.
Error type: ENOTSUP
Check if OS/Arch is supported by the package.
Error type: EBADPLATFORM
Check for cyclic dependencies.
Error type: ECYCLE
Check if a folder is a .git folder.
Error type: EISGIT