function hydrate(vnode, parentDom) {
	// @ts-expect-error
	vnode._flags |= MODE_HYDRATE;
	render(vnode, parentDom);
}
Update an existing DOM element with data from a Preact virtual node
@param {import('./internal').ComponentChild} vnode The virtual node to render
@param {import('./internal').PreactElement} parentDom The DOM element to update