const aHandle = await page.evaluateHandle('document');

const aHandle = await page.evaluateHandle(() => document.body);
const resultHandle = await page.evaluateHandle(
  body => body.innerHTML,
  aHandle
);
console.log(await resultHandle.jsonValue());
await resultHandle.dispose();

Most of the time this function returns a JSHandle, but if pageFunction returns a reference to an element, you instead get an ElementHandle back:

const button = await page.evaluateHandle(() =>
  document.querySelector('button')
);
// can call `click` because `button` is an `ElementHandle`
await button.click();

The TypeScript definitions assume that evaluateHandle returns a JSHandle, but if you know it's going to return an ElementHandle, pass it as the generic argument:

const button = await page.evaluateHandle<ElementHandle>(...);