TypeStrong/ts-node: TypeScript execution and REPL for node.js
Useful-looking tool that makes TypeScript usable on the command line, amongst other things.
Good little article about the pitfalls of using boolean values as parameters for a function. Not the first time I've seen this sort of thing (I'm sure I read a similar article years before, and a similar thing in a coding book even earlier).
Still good advice.
At least it's a little better in languages with keyword arguments.