Passive EventListenerをサポートしているか判定
/**
* Passive EventListenerをサポートしているか判定
* @see https://github.com/WICG/EventListenerOptions/blob/gh-pages/explainer.md#feature-detection
*/
export default function isSupportsPassive() {
let supportsPassive = false;
try {
let opts = Object.defineProperty({}, 'passive', {
get: function() {
supportsPassive = true;
}
});
window.addEventListener('testPassive', null, opts);
window.removeEventListener('testPassive', null, opts);
} catch (e) {
// Not support
}
return supportsPassive;
}