Transform fb-internal code within plugins

Summary: This diff changes flipper-pkg to allow using fb-internal code in plugins when they are packaged as standalone packages. It basically transforms fb-stubs/fb folders in plugins in the same way as for Flipper app.

Reviewed By: passy

Differential Revision: D27173406

fbshipit-source-id: 8ba97d5f57b5e276c19d13270a0d810873504add

desktop/babel-transformer/src/transform-main.ts

@@ -17,10 +17,7 @@ const presets = [
     {targets: {electron: flipperEnv.FLIPPER_ELECTRON_VERSION}},
   ],
 ];
-const plugins = [require('./electron-requires-main')];
-if (flipperEnv.FLIPPER_FB) {
-  plugins.unshift(require('./fb-stubs'));
-}
+const plugins = [require('./electron-requires-main'), require('./fb-stubs')];
 
 module.exports = {
   transform,