WARNING Cannot find source file index.ts

[fdambrosio]

Hello,
I have this error (on terminal and browser console) when I run yarn install or yarn start.
I've simply installed the module and added the import in the app.module code.
I'm using Angular4 and WebPack.

WARNING in ./~/angular2-busy/index.js
(Emitted value instead of an instance of Error) Cannot find source file '../index.ts': Error: Can't resolve '../index.ts' in '.../node_modules/angular2-busy'

[fdambrosio]

how can I fix this warning?