WIP to fixup CI

[caitp]

No description provided.

[caitp]

@nonara so adding the type definition file is interfering with instrumenting the library for coverage :( This should be fixable with fishbar/jscoverage#45 merged (at which point it will be possible to exclude *.ts files).

In the mean time, you could try to get this in the @types registry

[nonara]

@caitp Interesting! Nice work on the fixes. I recently moved from mocha, chai, nyc, rewire, & sinon over to Jest. I'm usually quite hesitant to change from a proven tool to a newer one, and I generally don't like Facebook.

With that said, Jest has not ceased to impress! Spies, mocks, coverage, TS integration, etc - all seamless and built-in. Overall, it's also just built very well. Many improvements. If you've not had a chance yet, you might enjoy it for a future project!