Primitive UUID in TypeScript

uuid.ts

export function uuid(value?: string): bigint {
	const uuid = value || crypto.randomUUID()
	return BigInt('0x' + uuid.replace(/-/g, ''))
}

export function uuidString(uuid?: bigint): string {
	if (!uuid) {
		return crypto.randomUUID()
	}
	const str = uuid.toString(16).padStart(32, '0')
	const g1 = str.substring(0, 8)
	const g2 = str.substring(8, 12)
	const g3 = str.substring(12, 16)
	const g4 = str.substring(16, 20)
	const g5 = str.substring(20, 32)
	return `${g1}-${g2}-${g3}-${g4}-${g5}`
}