"The missing JS randomness library" is a provocative subtitle. :) Have you compared your project to Random.js? https://www.npmjs.com/package/random-js There's also Rando.js but that project also appears to use a biased algorithm.
Looking at random-js, the barrier to entry is higher. I've looked at randomness libraries and that's the feeling they gave me: That I would need to learn how randomness works, rather than just calling a function for what I want; a random int, a weighted random. Cmd+F "weighted" doesn't find anything on both of those projects' readmes.
There's a tradeoff for simplicity, but in many cases I'll take it. This is the iPhone of randomness and that's what I needed to feel comfortable using it rather than rolling my own.