diff --git a/typescript/types/other.d.ts b/typescript/types/other.d.ts
index 2a58b9fe1..8f0d07855 100644
--- a/typescript/types/other.d.ts
+++ b/typescript/types/other.d.ts
@@ -9,3 +9,5 @@ interface IArguments {
 
 // Helper type
 type Exclude<T, U> = T extends U ? never : T;
+
+type ReturnType<T> = T extends (...args: any[]) => infer R ? R : never;