vanillajs-browser-helpers/eventOptionsSupported.js

Collection of convenience code snippets (helpers) that aims to make it a little easier to work with vanilla JS in the browser

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var supported;
/**
 * Detect if options are supported by the add-/removeEventListener methods
 *
 * @param recheck - Force the function to check the support again
 * @return Are event binding options supported or not
 */
function eventOptionsSupported(recheck) {
    if (supported != null && !recheck) {
        return supported;
    }
    supported = false;
    try {
        var opts = Object.defineProperty({}, 'passive', {
            get: function () {
                supported = true;
                return supported;
            }
        });
        var noop = function () { return undefined; };
        document.addEventListener('verify-support', noop, opts);
        document.removeEventListener('verify-support', noop, opts);
    }
    catch (_a) { }
    return supported;
}
exports.default = eventOptionsSupported;