react-canvas-draw/lib/makePassiveEventOption.js

A simple yet powerful canvas-drawing component for React.

"use strict";

exports.__esModule = true;
exports["default"] = makePassiveEventOption;
// Determines if the browser supprots passive events
// https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#Safely_detecting_option_support
var passiveSupported = false;

try {
  var options = {
    get passive() {
      passiveSupported = true;
      return false;
    }

  };
  window.addEventListener("test", options, options);
  window.removeEventListener("test", options, options);
} catch (e) {
  passiveSupported = false;
}

function makePassiveEventOption(passive) {
  return passiveSupported ? {
    passive: passive
  } : passive;
}

module.exports = exports.default;