typescript: colorResult has no source
in index.d.ts
![image](https://user-images.githubusercontent.com/47104575/87500432-f669b580-c68e-11ea-94f5-1aaf670aace4.png)
I want to use source,like this

I added this manually,but this is not a solution and I need to modify node_modules,it is a bug?
![image](https://user-images.githubusercontent.com/47104575/87500450-041f3b00-c68f-11ea-9e18-69d518f37edb.png)


