Typescript support

[cajoy]

There is weak typescript support.

It works but

I have some files with just typings and it is used by Typescript on compile stage. But the plugin still indicate those files as not used

[MatthieuLemoine]

Well I've never used Typescript. Maybe someone with some Typescript knowledge could make a PR to improve the support

[AlahmadiQ8]

different environments will inevitably have specific files not considered by the plugin. In this case, I think this should be easily handled by the exclude config option.