Pseudo-random number generator for TypeScript

prng.ts

let storedSeed: number = 1337;

// MurmurHash3
export function seed(str: string): void {
	for(let i = 0, h = 1779033703 ^ str.length; i < str.length; i++) {
		h = Math.imul(h ^ str.charCodeAt(i), 3432918353),
		h = h << 13 | h >>> 19;

		if (i === str.length - 1) {
			storedSeed = h;
		}
	}
}

// SplitMix32
export function rand(): number {
	storedSeed |= 0; storedSeed = storedSeed + 0x9e3779b9 | 0;
	let t = storedSeed ^ storedSeed >>> 16; t = Math.imul(t, 0x21f0aaad);
	t = t ^ t >>> 15; t = Math.imul(t, 0x735a2d97);
	return ((t = t ^ t >>> 15) >>> 0) / 4294967296;
}

// Pseudo UUID
export function guid(): string {
	return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
		const r = rand() * 16 | 0;
		const v = c === 'x' ? r : (r & 0x3 | 0x8);
		return v.toString(16);
	});
}