How to add my custom .d.ts file to my angular library?

I've created angular library using Yeoman generator library (https://github.com/jvandemo/generator-angular2-library). Then I want to add files with my custom types and place them into src/types folder, but compiler doesn't see them.

I've tried to use different paths in types, typeRoots in tsconfig.es5.json, but no luck yet.

Created a simple repo reproducing the problem: https://github.com/yuriykuzin/ng2-sample-library

Any help is much appreciated. Thanks in advance!