Add simple ULID generator

ulid.js

@@ -0,0 +1,37 @@
+const lookup = "0123456789ABCDEFGHJKMNPQRSTVWXYZ"
+
+const base32 = array => {
+	const size = array.BYTES_PER_ELEMENT * 8
+	const b32_length = Math.ceil(array.length * size / 5)
+	const buffer = new Array(b32_length)
+	let pointer = array.length
+	let acc = array[--pointer]
+	let bits = size
+	for (let i=b32_length-1; i>=0; --i) {
+		while (bits < 5) {
+			if (pointer > 0)
+				acc += (array[--pointer] * 2 ** bits)
+			bits += size
+		}
+		buffer[i] = lookup[acc % 32]
+		acc = Math.floor(acc / 32)
+		bits -= 5
+	}
+	return buffer.join('')
+}
+
+const bytes = length => integer => {
+	const array = new Uint8Array(length)
+	for (let i=length-1; i>=0; --i) {
+		array[i] = Math.floor(integer % 256)
+		integer = integer / 256
+	}
+	return array
+}
+
+export default (time = Date.now()) => {
+	const array = new Uint8Array(16)
+	array.set(bytes(6)(time))
+	array.set(crypto.getRandomValues(new Uint8Array(10)), 6)
+	return base32(array)
+}