fix(types): change `Function` to `(args: any) => any`

.gitignore

@@ -64,3 +64,4 @@ tags
 *.wechaty.json
 /package
 /wechaty-*.*.*.tgz
+package-lock.json

src/room.ts

@@ -166,7 +166,7 @@ export class Room extends EventEmitter implements Sayable {
   public on(event: 'topic', listener: (this: Room, topic: string, oldTopic: string, changer: Contact) => void): this
   public on(event: 'EVENT_PARAM_ERROR', listener: () => void): this
 
-  public on(event: RoomEventName, listener: Function): this {
+  public on(event: RoomEventName, listener: (args: any) => any): this {
     log.verbose('Room', 'on(%s, %s)', event, typeof listener)
 
     // const thisWithSay = {

src/wechaty.ts

@@ -282,7 +282,7 @@ export class Wechaty extends EventEmitter implements Sayable {
    * @todo document me
    */
 
-  public on(event: WechatyEventName, listener: Function): this {
+  public on(event: WechatyEventName, listener: (args: any) => any): this {
     log.verbose('Wechaty', 'addListener(%s, %s)', event, typeof listener)
 
     // const thisWithSay: Sayable = {