chore: upgrade mitt

docs/api/puppeteer.eventemitter.addlistener.md

@@ -14,16 +14,16 @@ Add an event listener.
 
 ```typescript
 class EventEmitter {
-  addListener(event: EventType, handler: Handler): EventEmitter;
+  addListener(event: EventType, handler: Handler<any>): EventEmitter;
 }
 ```
 
 ## Parameters
 
-| Parameter | Type                                  | Description |
-| --------- | ------------------------------------- | ----------- |
-| event     | [EventType](./puppeteer.eventtype.md) |             |
-| handler   | [Handler](./puppeteer.handler.md)     |             |
+| Parameter | Type                                         | Description |
+| --------- | -------------------------------------------- | ----------- |
+| event     | [EventType](./puppeteer.eventtype.md)        |             |
+| handler   | [Handler](./puppeteer.handler.md)&lt;any&gt; |             |
 
 **Returns:**
 

docs/api/puppeteer.eventemitter.off.md

@@ -10,16 +10,16 @@ Remove an event listener from firing.
 
 ```typescript
 class EventEmitter {
-  off(event: EventType, handler: Handler): EventEmitter;
+  off(event: EventType, handler: Handler<any>): EventEmitter;
 }
 ```
 
 ## Parameters
 
-| Parameter | Type                                  | Description                                     |
-| --------- | ------------------------------------- | ----------------------------------------------- |
-| event     | [EventType](./puppeteer.eventtype.md) | the event type you'd like to stop listening to. |
-| handler   | [Handler](./puppeteer.handler.md)     | the function that should be removed.            |
+| Parameter | Type                                         | Description                                     |
+| --------- | -------------------------------------------- | ----------------------------------------------- |
+| event     | [EventType](./puppeteer.eventtype.md)        | the event type you'd like to stop listening to. |
+| handler   | [Handler](./puppeteer.handler.md)&lt;any&gt; | the function that should be removed.            |
 
 **Returns:**
 

docs/api/puppeteer.eventemitter.on.md

@@ -10,16 +10,16 @@ Bind an event listener to fire when an event occurs.
 
 ```typescript
 class EventEmitter {
-  on(event: EventType, handler: Handler): EventEmitter;
+  on(event: EventType, handler: Handler<any>): EventEmitter;
 }
 ```
 
 ## Parameters
 
-| Parameter | Type                                  | Description                                                        |
-| --------- | ------------------------------------- | ------------------------------------------------------------------ |
-| event     | [EventType](./puppeteer.eventtype.md) | the event type you'd like to listen to. Can be a string or symbol. |
-| handler   | [Handler](./puppeteer.handler.md)     | the function to be called when the event occurs.                   |
+| Parameter | Type                                         | Description                                                        |
+| --------- | -------------------------------------------- | ------------------------------------------------------------------ |
+| event     | [EventType](./puppeteer.eventtype.md)        | the event type you'd like to listen to. Can be a string or symbol. |
+| handler   | [Handler](./puppeteer.handler.md)&lt;any&gt; | the function to be called when the event occurs.                   |
 
 **Returns:**
 

docs/api/puppeteer.eventemitter.once.md

@@ -10,16 +10,16 @@ Like `on` but the listener will only be fired once and then it will be removed.
 
 ```typescript
 class EventEmitter {
-  once(event: EventType, handler: Handler): EventEmitter;
+  once(event: EventType, handler: Handler<any>): EventEmitter;
 }
 ```
 
 ## Parameters
 
-| Parameter | Type                                  | Description                                       |
-| --------- | ------------------------------------- | ------------------------------------------------- |
-| event     | [EventType](./puppeteer.eventtype.md) | the event you'd like to listen to                 |
-| handler   | [Handler](./puppeteer.handler.md)     | the handler function to run when the event occurs |
+| Parameter | Type                                         | Description                                       |
+| --------- | -------------------------------------------- | ------------------------------------------------- |
+| event     | [EventType](./puppeteer.eventtype.md)        | the event you'd like to listen to                 |
+| handler   | [Handler](./puppeteer.handler.md)&lt;any&gt; | the handler function to run when the event occurs |
 
 **Returns:**
 

docs/api/puppeteer.eventemitter.removelistener.md

@@ -14,16 +14,16 @@ Remove an event listener.
 
 ```typescript
 class EventEmitter {
-  removeListener(event: EventType, handler: Handler): EventEmitter;
+  removeListener(event: EventType, handler: Handler<any>): EventEmitter;
 }
 ```
 
 ## Parameters
 
-| Parameter | Type                                  | Description |
-| --------- | ------------------------------------- | ----------- |
-| event     | [EventType](./puppeteer.eventtype.md) |             |
-| handler   | [Handler](./puppeteer.handler.md)     |             |
+| Parameter | Type                                         | Description |
+| --------- | -------------------------------------------- | ----------- |
+| event     | [EventType](./puppeteer.eventtype.md)        |             |
+| handler   | [Handler](./puppeteer.handler.md)&lt;any&gt; |             |
 
 **Returns:**
 

docs/api/puppeteer.handler.md

@@ -7,5 +7,5 @@ sidebar_label: Handler
 #### Signature:
 
 ```typescript
-declare type Handler<T = any> = (event?: T) => void;
+declare type Handler<T = unknown> = (event: T) => void;
 ```

package.json

@@ -81,7 +81,7 @@
     "jpeg-js": "0.4.4",
     "mime": "3.0.0",
     "minimist": "1.2.6",
-    "mitt": "2.1.0",
+    "mitt": "3.0.0",
     "mocha": "10.0.0",
     "ncp": "2.0.0",
     "npm-run-all": "4.1.5",

packages/puppeteer-core/src/api/Page.ts

@@ -425,7 +425,7 @@ export interface PageEventObject {
  * @public
  */
 export class Page extends EventEmitter {
-  #handlerMap = new WeakMap<Handler, Handler>();
+  #handlerMap = new WeakMap<Handler<any>, Handler<any>>();
 
   /**
    * @internal

packages/puppeteer-core/src/common/EventEmitter.ts

@@ -17,6 +17,7 @@
 import mitt, {
   Emitter,
   EventType,
+  EventHandlerMap,
   Handler,
 } from '../../third_party/mitt/index.js';
 
@@ -57,8 +58,8 @@ export interface CommonEventEmitter {
  * @public
  */
 export class EventEmitter implements CommonEventEmitter {
-  private emitter: Emitter;
-  private eventsMap = new Map<EventType, Handler[]>();
+  private emitter: Emitter<Record<string | symbol, any>>;
+  private eventsMap: EventHandlerMap<Record<string | symbol, any>> = new Map();
 
   /**
    * @internal
@@ -73,7 +74,7 @@ export class EventEmitter implements CommonEventEmitter {
    * @param handler - the function to be called when the event occurs.
    * @returns `this` to enable you to chain method calls.
    */
-  on(event: EventType, handler: Handler): EventEmitter {
+  on(event: EventType, handler: Handler<any>): EventEmitter {
     this.emitter.on(event, handler);
     return this;
   }
@@ -84,7 +85,7 @@ export class EventEmitter implements CommonEventEmitter {
    * @param handler - the function that should be removed.
    * @returns `this` to enable you to chain method calls.
    */
-  off(event: EventType, handler: Handler): EventEmitter {
+  off(event: EventType, handler: Handler<any>): EventEmitter {
     this.emitter.off(event, handler);
     return this;
   }
@@ -93,7 +94,7 @@ export class EventEmitter implements CommonEventEmitter {
    * Remove an event listener.
    * @deprecated please use {@link EventEmitter.off} instead.
    */
-  removeListener(event: EventType, handler: Handler): EventEmitter {
+  removeListener(event: EventType, handler: Handler<any>): EventEmitter {
     this.off(event, handler);
     return this;
   }
@@ -102,7 +103,7 @@ export class EventEmitter implements CommonEventEmitter {
    * Add an event listener.
    * @deprecated please use {@link EventEmitter.on} instead.
    */
-  addListener(event: EventType, handler: Handler): EventEmitter {
+  addListener(event: EventType, handler: Handler<any>): EventEmitter {
     this.on(event, handler);
     return this;
   }
@@ -125,8 +126,8 @@ export class EventEmitter implements CommonEventEmitter {
    * @param handler - the handler function to run when the event occurs
    * @returns `this` to enable you to chain method calls.
    */
-  once(event: EventType, handler: Handler): EventEmitter {
-    const onceHandler: Handler = eventData => {
+  once(event: EventType, handler: Handler<any>): EventEmitter {
+    const onceHandler: Handler<any> = eventData => {
       handler(eventData);
       this.off(event, onceHandler);
     };

test/src/CDPSession.spec.ts

@@ -64,7 +64,10 @@ describe('Target.createCDPSession', function () {
     client.on('Network.requestWillBeSent', event => {
       return events.push(event);
     });
-    await page.goto(server.EMPTY_PAGE);
+    await Promise.all([
+      waitEvent(client, 'Network.requestWillBeSent'),
+      page.goto(server.EMPTY_PAGE),
+    ]);
     expect(events.length).toBe(1);
   });
   it('should enable and disable domains independently', async () => {