Commits on Jan 2, 2019

1. Show problem path in invariant message …

   Sometimes, `yarn add` will fail unexpectedly, and it leaves the cache in an invalid state. To cause your yarn cache to become corrupted:
   
   ```
   $ yarn add [email protected]
   yarn add v1.12.3
   [1/4] 🔍  Resolving packages...
   [2/4] 🚚  Fetching packages...
   error https://registry.yarnpkg.com/event-stream/-/event-stream-3.3.6.tgz: Extracting tar content of undefined failed, the file appears to be corrupt: "Unexpected end of data"
   info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.
   
   $ yarn cache list
   yarn cache v1.12.3
   error An unexpected error occurred: "There should only be one folder in a package cache (got  )".
   info If you think this is a bug, please open a bug report with the information provided in "/Users/rpatterson/Projects/chess2/www2/client/yarn-error.log".
   info Visit https://yarnpkg.com/en/docs/cli/cache for documentation about this command.
   ```
   
   Note that the error message provides no information about how to resolve the error. This commit adds the problem path to the invariant message. Deleting this problem path will allow `yarn cache list` to work properly again.
   
   The root cause of this issue is yarn#6805 which has been closed. This commit does not resolve the issue, so that issue should likely be reopened.

   

   CGamesPlay authored Jan 2, 2019
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