event-listener-with-options/js/supportsCaptureOption.js

Polyfill for EventTarget options object support

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = supportsCaptureOption;
var cachedResult = null;

function supportsCaptureOption() {
  if (cachedResult === null) {
    var result = false;

    try {
      var opts = Object.defineProperty({}, 'capture', {
        get: function get() {
          result = true;
          return undefined;
        }
      });
      window.addEventListener('test', null, opts);
    } catch (e) {//ignore
    }

    cachedResult = result;
  }

  return cachedResult;
}
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