module.exports = ExpanderHook function ExpanderHook (needsExpand) { return expander.bind(null, needsExpand) } function expander (needsExpand, element) { var handler = { handleEvent, needsExpand, element } handleEvent.call(handler) if (element.querySelector('img')) { // just in case images are still loading setTimeout(handleEvent.bind(handler), 200) element.addEventListener('mouseover', handler) return element.removeEventListener.bind(element, 'mouseover', handler) } } function handleEvent (ev) { var { needsExpand, element } = this if (!needsExpand()) { if (element.firstElementChild && element.firstElementChild.clientHeight > element.clientHeight) { needsExpand.set(true) } } }