ADD: definition file for the moment-duration-format library (#11557)

moment-duration-format/moment-duration-format.d.ts

@@ -0,0 +1,11 @@
+// Type definitions for moment-duration-format v1.3.0
+// Project: https://github.com/jsmreese/moment-duration-format
+// Definitions by: Swint De Coninck <https://github.com/SwintDC>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+
+declare namespace moment {
+    interface Duration {
+        format(template: string, precision?: string, settings?: any): string;
+    }
+}