All files / src/utils/event index.js

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const event = {
    on(element, type, listener, options) {
        element.addEventListener(type, listener, options);
        return () => event.off(element, type, listener, options);
    },
    off(element, type, listener, options) {
        element.removeEventListener(type, listener, options);
    },
    once(element, type, listener) {
        const fn = function (...args) {
            listener.apply(this, args);
            event.off(element, type, fn);
        };
        event.on(element, type, fn);
    },
};
 
export default event;