Summary: After some testing I found file source map does not work as expected when prod version of Flipper is used to debug plugin. So returning back inline source maps. Note that this only affects debug builds, for production builds no source maps will be produced anyway.
Reviewed By: passy
Differential Revision: D22161927
fbshipit-source-id: 068b9da09da4dcb6c31aff4e5a15bd6438f686b3