use interfaces wherever possible, they compile/parse faster

[xaviergonz]

this small pull request is to change some types to interfaces wherever possible, since they are compiled/parsed faster by TS

[xaviergonz]

while at it also converted the last tests files that were in js to ts

[mweststrate]

@xaviergonz ok, let me know when you are comfortable with the changes!

[xaviergonz]

that should be it 👌

…

On Wed, Jul 25, 2018, 19:47 Michel Weststrate ***@***.***> wrote: @xaviergonz <https://github.com/xaviergonz> ok, let me know when you are comfortable with the changes! — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#945 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AGA77Dk2NhIliKQJzua37U2044dtJMYaks5uKK8fgaJpZM4VgZ30> .

[mweststrate]

Thanks!