rng.js

import crypto from 'crypto';
const rnds8Pool = new Uint8Array(256); // # of random values to pre-allocate

let poolPtr = rnds8Pool.length;
export default function rng() {
  if (poolPtr > rnds8Pool.length - 16) {
    crypto.randomFillSync(rnds8Pool);
    poolPtr = 0;
  }

  return rnds8Pool.slice(poolPtr, poolPtr += 16);
}