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41 lines
1.3 KiB
Markdown
41 lines
1.3 KiB
Markdown
---
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sidebar_label: WebWorker.evaluateHandle
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---
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# WebWorker.evaluateHandle() method
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Evaluates a given function in the [worker](./puppeteer.webworker.md).
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#### Signature:
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```typescript
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class WebWorker {
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evaluateHandle<
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Params extends unknown[],
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Func extends EvaluateFunc<Params> = EvaluateFunc<Params>,
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>(
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func: Func | string,
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...args: Params
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): Promise<HandleFor<Awaited<ReturnType<Func>>>>;
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}
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```
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## Parameters
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| Parameter | Type | Description |
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| --------- | -------------- | ----------------------------------------- |
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| func | Func \| string | Function to be evaluated. |
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| args | Params | Arguments to pass into <code>func</code>. |
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**Returns:**
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Promise<[HandleFor](./puppeteer.handlefor.md)<Awaited<ReturnType<Func>>>>
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A [handle](./puppeteer.jshandle.md) to the return value of `func`.
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## Remarks
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If the given function returns a promise, [evaluate](./puppeteer.webworker.evaluate.md) will wait for the promise to resolve.
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In general, you should use [evaluateHandle](./puppeteer.webworker.evaluatehandle.md) if [evaluate](./puppeteer.webworker.evaluate.md) cannot serialize the return value properly or you need a mutable [handle](./puppeteer.jshandle.md) to the return object.
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