revert if things

src/decorators.ts

@@ -127,12 +127,12 @@ export const PluginName = (name: string) =>
 
 export const If = <T>(
   func: Condition<boolean, T, [Record<string, any>]>,
-): TypedMethodDecorator<T> =>
+): MethodDecorator =>
   Metadata.append('KoishiControl', { type: 'if', condition: func });
 
 export const For = <T>(
   func: Condition<Iterable<Record<string, any>>, T, [Record<string, any>]>,
-): TypedMethodDecorator<T> =>
+): MethodDecorator =>
   Metadata.append('KoishiControl', { type: 'for', condition: func });
 
 export const UseModel = (...models: ModelClassType[]): ClassDecorator =>

src/def/interfaces.ts

@@ -48,12 +48,6 @@ export type MapPluginToConfigWithSelection<M extends Dict<PluginClass>> = {
   [K in keyof M]: ClassPluginConfig<M[K]> & Selection;
 };
 
-export type TypedMethodDecorator<T> = <P>(
-  target: T,
-  propertyKey: string | symbol,
-  descriptor: TypedPropertyDescriptor<P>,
-) => void;
-
 export interface ControlTypeMap {
   if: boolean;
   for: Iterable<Record<string, any>>;