should add tests & coverage report

[Shuunen]

you can check https://github.com/avajs/ava/blob/master/docs/recipes/typescript.md

then for code coverage : https://github.com/avajs/ava/blob/master/docs/recipes/code-coverage.md

💯

[Shuunen]

also I used Ava & Nyc in one of my TS project : https://github.com/Shuunen/shuutils

if you wanna see how it looks 😃