Cool, thanks

There appears to be an issue with the 'basic' Typescript tests

Error: Timeout of 2000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/home/codewarrior/ts/test.ts)

I don't think it is my code, as all the other tests pass within 1ms...

I find this one very difficult to understand...

My mistake I thought negative integers were not natural numbers