Prior to this change `ngc` would place generated files which refer to components in the node_modules into the node_module. This is an issue. Now all of the files are forced into a single directory as specified in `tsconfig.json` by the `genDir` option. see: https://docs.google.com/document/d/1OgP1RIpZ-lWUc4113J3w13HTDcW-1-0o7TuGz0tGx0g