From Dara Hayes:

I'm not 100% sure on how to approach this but there are a couple of things that need to be done
1. Assess the current data-sync-server tests to see which ones should be moved over
2. Convert those to typescript <- easier than you'd expect
3. Figure out how the test structure should wor
For example - should we write the tests in Javascript or not? Does typescript force us to put the tests in a certain folder structure etc

Lastly, the test runner AVA mentions there is some ability to compile typescript on the fly. Can we take advantage of that somehow to make it generally less painful? https://github.com/avajs/ava/blob/master/docs/recipes/typescript.md
@Wojciech Trocki might have other opinions but IMO it might be handy to continue using AVA just in terms of moving stuff over