Note that you don't need the declaration files. They are entirely optional. You can get started right now and add them gradually as they get written by the community.
I would take the opportunity to address the DefinitelyType repository issues.
Actually if anyone from TypeScript team reads this, they should know people there are struggling with that.
There are multiple flaws in gathering so much development code under one roof and a lot of discussion that goes nowhere [1][2][3]. What would be great if there is some sort of "native" support / recommendation of definition files.
1 : https://github.com/borisyankov/DefinitelyTyped/issues/5040 2 : https://github.com/borisyankov/DefinitelyTyped/issues/2150 3 : https://github.com/borisyankov/DefinitelyTyped/issues/4513