feat: added IfSame utility type

Author: webdeveric

src/types/utils.ts

@@ -10,6 +10,8 @@ export type IfUnknown<Type, T, F> = unknown extends Type ? T : F;
 
 export type IfPromise<Type, T, F> = Type extends Promise<any> ? T : F;
 
+export type IfSame<Left, Right, T, F> = [Left] extends [Right] ? ([Right] extends [Left] ? T : F) : F;
+
 export type NotPromise<Type> = Type extends Promise<any> ? never : Type;
 
 export type CanBeUndefined<Type, T, F> = Type | undefined extends Type ? T : F;