add uuid

src/uuid.d.ts

@@ -0,0 +1,6 @@
+type VariantNibble = "8" | "9" | "A" | "B";
+
+type UUID<V extends '4'|'7'> = `${string}-${string}-${V}${string}-${VariantNibble}${string}-${string}`
+
+type UUIDv4 = UUID<'4'>;
+type UUIDv7 = UUID<'7'>;