diff --git a/types.ts b/types.ts
index 96a3861..29a1199 100644
--- a/types.ts
+++ b/types.ts
@@ -28,4 +28,9 @@ export type Posix = {
 }
 
 export type Base64String = `${string}`
-export type UrlString = `${string}`
+export type UrlString = `${
+	| 'data:'
+	| 'file://'
+	| 'http://'
+	| 'https://'
+	| 'git:'}${string}`