element-plus/es/directives/mousewheel/index.js

> TODO: description

import normalizeWheel from 'normalize-wheel';
const isFirefox = typeof navigator !== 'undefined' &&
    navigator.userAgent.toLowerCase().indexOf('firefox') > -1;
const mousewheel = function (element, callback) {
    if (element && element.addEventListener) {
        const fn = function (event) {
            const normalized = normalizeWheel(event);
            callback && callback.apply(this, [event, normalized]);
        };
        if (isFirefox) {
            element.addEventListener('DOMMouseScroll', fn);
        }
        else {
            element.onmousewheel = fn;
        }
    }
};
const Mousewheel = {
    beforeMount(el, binding) {
        mousewheel(el, binding.value);
    },
};
export default Mousewheel;