random.ts

// nolib ANSI RNG
export const m = 2 ** 31; // just outside of i32
export const a = 1103515245;
export const c = 12345;

// returns integer [0; 2 ** 31 -1]
export function rand(seed: number): () => number {
  return () => (seed = (a * seed + c) % m | 0);
}

// returns float [0; 1]
export function randf(seed: number): () => number {
  const rint = rand(seed);
  return () => rint() / (m - 1);
}