@mapbox/mapbox-gl-style-spec/util/random.ts

a specification for mapbox gl styles

// Seeded pseudo random generator function
export function mulberry32(a: number): () => number {
    return function () {
        a |= 0;
        a = (a + 0x6d2b79f5) | 0;
        let t = Math.imul(a ^ (a >>> 15), 1 | a);
        t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
        return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
    };
}