Wrong typing of getPopupContainer

[zaycker]

By reviewing attachParent method:

trigger/src/index.tsx

Lines 572 to 590 in 89eefdb

	mountNode = getPopupContainer(domNode);
	}
	if (mountNode) {
	mountNode.appendChild(popupContainer);
	} else {
	// Retry after frame render in case parent not ready
	this.attachId = raf(() => {
	this.attachParent(popupContainer);
	});
	}
	};
	getContainer = () => {
	const { getDocument } = this.props;
	const popupContainer = getDocument(this.getRootDomNode()).createElement(
	'div',
	);
	// Make sure default popup container will never cause scrollbar appearing

that means getPopupContainer is able to return falsy value exactly "in case parent not ready". but it is blocked by strict typings:

trigger/src/index.tsx

Line 75 in 89eefdb

getPopupContainer?: (node: HTMLElement) => HTMLElement;

may I create PR? actually it is also existent in Tooltip where I came from initially...