puppeteer/new-docs/puppeteer.evaluatefn.md

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[Home](./index.md) &gt; [puppeteer](./puppeteer.md) &gt; [EvaluateFn](./puppeteer.evaluatefn.md)

## EvaluateFn type


<b>Signature:</b>

```typescript
export declare type EvaluateFn<T = unknown> = string | ((arg1: T, ...args: unknown[]) => unknown);
```
feat(types): improve typing of `.evaluate()` (#6096) * 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. 2020-06-25 12:38:01 +00:00			`<!-- Do not edit this file. It is automatically generated by API Documenter. -->`

			`[Home](./index.md) > [puppeteer](./puppeteer.md) > [EvaluateFn](./puppeteer.evaluatefn.md)`

			`## EvaluateFn type`


			`<b>Signature:</b>`

			```typescript
feat(types): improve page.evaluate types (#6193) 2020-07-10 10:52:13 +00:00			`export declare type EvaluateFn<T = unknown> = string \| ((arg1: T, ...args: unknown[]) => unknown);`
feat(types): improve typing of `.evaluate()` (#6096) * 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. 2020-06-25 12:38:01 +00:00			```