A JavaScript Guid / UUID generator (works on node and web)

uuid.js

function randomUUID() {
	const GUID_STRUCTURE = "xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx";
	const GUID_CHARACTERS = {
		"x": "0123456789abcdef",
		"M": "12345",
		"N": "89ab"
	}

	const replaceCharacter = (character) => {
		const characters = GUID_CHARACTERS[character];
		const index = (typeof module === "object" &&
			typeof process === "object" &&
			typeof require === "function")
			? require("crypto").randomInt(characters.length)
			: Math.floor(Math.random() * characters.length);
		return characters[index];
	}

	return GUID_STRUCTURE
		.replace(/M/gi, replaceCharacter)
		.replace(/N/gi, "4")
		.replace(/x/gi, replaceCharacter);
}