f07ad2c661
This PR updates the docs regarding configuring puppeteer. In addition, some changes have been made to the documentation generator to show default values on the documentation site. Also fixes: https://github.com/puppeteer/puppeteer/pull/9144
35 lines
1.3 KiB
Markdown
35 lines
1.3 KiB
Markdown
---
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sidebar_label: WebWorker.evaluate
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---
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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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#### Signature:
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```typescript
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class WebWorker {
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evaluate<
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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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pageFunction: Func | string,
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...args: Params
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): Promise<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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| pageFunction | Func \| string | Function to be evaluated in the worker context. |
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| args | Params | Arguments to pass to <code>pageFunction</code>. |
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**Returns:**
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Promise<Awaited<ReturnType<Func>>>
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Promise which resolves to the return value of `pageFunction`.
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