46fc6ca41a
* feat(types): improve typing of `.evaluate()` This is the start of the work to take the types from the `@types/puppeteer` repository and port them into our repo so we can ship our built-in types out the box. This change types the `evaluate` function properly. It takes a generic type which is the type of the function you're passing, and the arguments and the return that you get back from the `evaluate` call are typed correctly.
35 lines
1.1 KiB
Markdown
35 lines
1.1 KiB
Markdown
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
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[Home](./index.md) > [puppeteer](./puppeteer.md) > [JSHandle](./puppeteer.jshandle.md) > [evaluate](./puppeteer.jshandle.evaluate.md)
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## JSHandle.evaluate() method
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This method passes this handle as the first argument to `pageFunction`<!-- -->. If `pageFunction` returns a Promise, then `handle.evaluate` would wait for the promise to resolve and return its value.
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<b>Signature:</b>
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```typescript
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evaluate<T extends EvaluateFn>(pageFunction: T | string, ...args: SerializableOrJSHandle[]): Promise<EvaluateFnReturnType<T>>;
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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 | T \| string | |
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| args | [SerializableOrJSHandle](./puppeteer.serializableorjshandle.md)<!-- -->\[\] | |
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<b>Returns:</b>
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Promise<[EvaluateFnReturnType](./puppeteer.evaluatefnreturntype.md)<!-- --><T>>
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## Example
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```js
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const tweetHandle = await page.$('.tweet .retweets');
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expect(await tweetHandle.evaluate(node => node.innerText)).toBe('10');
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```
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