1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | 1x 2x 2x 2x 1x 2x 1x 2x 1x | export const eventListenerOptionsSupported = () => { let supported = false; try { const opts = Object.defineProperty({}, 'passive', { get() { supported = true; } }); window.addEventListener('test', null, opts); window.removeEventListener('test', null, opts); } catch (e) {} return supported; } export const noop = () => {}; |