puppeteer/website/versioned_docs/version-21.9.0/api/puppeteer.webworker.evaluatehandle.md

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WebWorker.evaluateHandle

WebWorker.evaluateHandle() method

Evaluates a given function in the worker.

Signature:

class WebWorker {
  evaluateHandle<
    Params extends unknown[],
    Func extends EvaluateFunc<Params> = EvaluateFunc<Params>,
  >(
    func: Func | string,
    ...args: Params
  ): Promise<HandleFor<Awaited<ReturnType<Func>>>>;
}

Parameters

Parameter	Type	Description
func	Func | string	Function to be evaluated.
args	Params	Arguments to pass into func.

Returns:

Promise<HandleFor<Awaited<ReturnType<Func>>>>

A handle to the return value of func.

Remarks

If the given function returns a promise, evaluate will wait for the promise to resolve.

In general, you should use evaluateHandle if evaluate cannot serialize the return value properly or you need a mutable handle to the return object.