Summary:
Fixed error "SHA-1 for file is not computed" on 3rd party plugin compilation in dev mode. The error started to appear after moving to yarn workspaces.
Changelog: Fixed error "SHA-1 for file is not computed" on 3rd party plugin compilation in dev mode (yarn start).
Reviewed By: mweststrate
Differential Revision: D20789712
fbshipit-source-id: bbc2fcca197955da50ebf2b51a1fd9cb62f79727