for nestjs changes

src/def/interfaces.ts

@@ -63,8 +63,11 @@ export type BeforeEventName = OmitSubstring<EventName & string, 'before-'>;
 export type BeforeEventNameAndPrepend =
   CommonEventNameAndPrepend<BeforeEventName>;
 
-export type ContextFunction<T> = (ctx: Context) => T;
-export type OnContextFunction = ContextFunction<Context>;
+export type ContextFunction<T, C extends Context = Context> = (ctx: C) => T;
+export type OnContextFunction<C extends Context = Context> = ContextFunction<
+  C,
+  C
+>;
 
 export interface MappingStruct<
   T extends Record<string | number | symbol, any>,