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JSHandle.evaluate() method

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.

Signature:

evaluate<T extends EvaluateFn<HandleObjectType>>(pageFunction: T | string, ...args: SerializableOrJSHandle[]): Promise<UnwrapPromiseLike<EvaluateFnReturnType<T>>>;

Parameters

Parameter	Type	Description
pageFunction	T | string
args	SerializableOrJSHandle[]

Returns:

Promise<UnwrapPromiseLike<EvaluateFnReturnType<T>>>

Example

const tweetHandle = await page.$('.tweet .retweets');
expect(await tweetHandle.evaluate(node => node.innerText)).toBe('10');