For generating stable-but-random effects.

random.js

export default function randomGenerator(seed) {
  let state = seed;

  const next = () => {
    state |= 0;
    state = (state + 0x6d2b79f5) | 0;
    var t = Math.imul(state ^ (state >>> 15), 1 | state);
    t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
    return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
  };

  return {
    next,
    nextBetween: (from, to) => next() * (to - from) + from,
    fork: () => randomGenerator(next() * 2 ** 32),
  };
}