chore: migrate away from Node's EventEmitter (#5979)

new-docs/puppeteer.eventemitter.once.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [puppeteer](./puppeteer.md) &gt; [EventEmitter](./puppeteer.eventemitter.md) &gt; [once](./puppeteer.eventemitter.once.md)
+
+## EventEmitter.once() method
+
+Like `on` but the listener will only be fired once and then it will be removed.
+
+<b>Signature:</b>
+
+```typescript
+once(event: EventType, handler: Handler): EventEmitter;
+```
+
+## Parameters
+
+|  Parameter | Type | Description |
+|  --- | --- | --- |
+|  event | EventType | the event you'd like to listen to |
+|  handler | Handler | the handler function to run when the event occurs |
+
+<b>Returns:</b>
+
+[EventEmitter](./puppeteer.eventemitter.md)
+
+`this` to enable you to chain calls.
+