How to handle *.d.ts

[TrySound]

Should we strip import with them or handle somehow?
allowJs doesn't work with node_modules, which does not let to use typescript as transpiler for angular2 dependencies.
Maybe better to lay on rollup-plugin-node-resolve with some cases?

[StevenDoesStuffs]

Any updates?

[thgreasi]

Any updates?

[blackcater]

Any updates?

[drozdzynski]

Any updates?

[nickserv]

Duplicate of #54