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Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
135 lines
2.0 KiB
Markdown
135 lines
2.0 KiB
Markdown
---
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sidebar_label: WebWorker
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---
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# WebWorker class
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This class represents a [WebWorker](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API).
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#### Signature:
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```typescript
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export declare abstract class WebWorker extends EventEmitter<Record<EventType, unknown>>
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```
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**Extends:** [EventEmitter](./puppeteer.eventemitter.md)<Record<[EventType](./puppeteer.eventtype.md), unknown>>
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## Remarks
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The events `workercreated` and `workerdestroyed` are emitted on the page object to signal the worker lifecycle.
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The constructor for this class is marked as internal. Third-party code should not call the constructor directly or create subclasses that extend the `WebWorker` class.
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## Example
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```ts
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page.on('workercreated', worker =>
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console.log('Worker created: ' + worker.url())
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);
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page.on('workerdestroyed', worker =>
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console.log('Worker destroyed: ' + worker.url())
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);
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console.log('Current workers:');
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for (const worker of page.workers()) {
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console.log(' ' + worker.url());
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}
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```
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## Properties
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<table><thead><tr><th>
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Property
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</th><th>
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Modifiers
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</th><th>
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Type
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</th><th>
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Description
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</th></tr></thead>
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<tbody><tr><td>
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client
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</td><td>
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`readonly`
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</td><td>
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[CDPSession](./puppeteer.cdpsession.md)
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</td><td>
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The CDP session client the WebWorker belongs to.
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</td></tr>
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</tbody></table>
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## Methods
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<table><thead><tr><th>
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Method
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</th><th>
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Modifiers
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</th><th>
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Description
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</th></tr></thead>
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<tbody><tr><td>
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[close()](./puppeteer.webworker.close.md)
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</td><td>
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</td><td>
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</td></tr>
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<tr><td>
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[evaluate(func, args)](./puppeteer.webworker.evaluate.md)
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</td><td>
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</td><td>
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Evaluates a given function in the [worker](./puppeteer.webworker.md).
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</td></tr>
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<tr><td>
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[evaluateHandle(func, args)](./puppeteer.webworker.evaluatehandle.md)
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</td><td>
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</td><td>
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Evaluates a given function in the [worker](./puppeteer.webworker.md).
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</td></tr>
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<tr><td>
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[url()](./puppeteer.webworker.url.md)
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</td><td>
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</td><td>
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The URL of this web worker.
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</td></tr>
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</tbody></table>
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