dot-into, pipes in TypeScript

So I have a little library for JavaScript and TypeScript called dot-into, which is something I actually every so often use in personal projects I've written using said languages. I've posted about it before back when I launched it, and I've updated it a few times. Here's the short of it: // This: third(second(first(data)), moreData); // Becomes this: first(data).into(second).into(third, moreData); I just released version 3.0.0, which breaks ES5 compatibility but fixes some outstanding type inference problems that have existed since I introduced TypeScript support. Basically, it should now work with functions that use generic types. However, it's still broken for functions with multiple type signatures, sadly. But it's an easy fix: // This breaks inference: data.into(multiSignatureFn); // This doesn't: data.into((value) => multiSignatureFn(value)); I guess I wanted to post about it again because the biggest problem that it had, in my eyes, was that any null or undefined value in the