diff --git a/types/debug.d.ts b/types/debug.d.ts
new file mode 100644
index 000000000..15c00ea5c
--- /dev/null
+++ b/types/debug.d.ts
@@ -0,0 +1,9 @@
+
+declare const debug: (value: any) => void;
+
+declare module NodeJS {
+  interface Global {
+    debug: (value: any) => void;
+  }
+}
+