[Home](./index.md) > [puppeteer](./puppeteer.md) > [WebWorker](./puppeteer.webworker.md) > [evaluate](./puppeteer.webworker.evaluate.md) ## WebWorker.evaluate() method Signature: ```typescript evaluate(pageFunction: Function | string, ...args: any[]): Promise; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | pageFunction | Function \| string | | | args | any\[\] | | Returns: Promise<ReturnType>