28 lines
1.2 KiB
Markdown
28 lines
1.2 KiB
Markdown
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
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[Home](./index.md) > [puppeteer](./puppeteer.md) > [WebWorker](./puppeteer.webworker.md) > [evaluate](./puppeteer.webworker.evaluate.md)
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## WebWorker.evaluate() method
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If the function passed to the `worker.evaluate` returns a Promise, then `worker.evaluate` would wait for the promise to resolve and return its value. If the function passed to the `worker.evaluate` returns a non-serializable value, then `worker.evaluate` resolves to `undefined`. DevTools Protocol also supports transferring some additional values that are not serializable by `JSON`: `-0`, `NaN`, `Infinity`, `-Infinity`, and bigint literals. Shortcut for `await worker.executionContext()).evaluate(pageFunction, ...args)`.
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<b>Signature:</b>
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```typescript
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evaluate<ReturnType extends any>(pageFunction: Function | string, ...args: any[]): Promise<ReturnType>;
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```
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## Parameters
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| Parameter | Type | Description |
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| --- | --- | --- |
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| pageFunction | Function \| string | Function to be evaluated in the worker context. |
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| args | any\[\] | Arguments to pass to <code>pageFunction</code>. |
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<b>Returns:</b>
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Promise<ReturnType>
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Promise which resolves to the return value of `pageFunction`.
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