diff --git a/magic-number/magic-number.d.ts b/magic-number/magic-number.d.ts
new file mode 100644
index 0000000000..8f095d63cd
--- /dev/null
+++ b/magic-number/magic-number.d.ts
@@ -0,0 +1,8 @@
+// Type definitions for magic-number
+// Project: https://github.com/stpettersens/magic-number
+// Definitions by: Sam Saint-Pettersen <https://github.com/stpettersens>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module "magic-number" {
+    export function detectFile(file: string): string;
+}