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Filename : requestAnimationFrame.js

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'use strict';

/**
 * Copyright (c) 2014-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 */

var emptyFunction = require('./emptyFunction');
var nativeRequestAnimationFrame = require('./nativeRequestAnimationFrame');

var lastTime = 0;

var requestAnimationFrame = nativeRequestAnimationFrame || function (callback) {
  var currTime = Date.now();
  var timeDelay = Math.max(0, 16 - (currTime - lastTime));
  lastTime = currTime + timeDelay;
  return global.setTimeout(function () {
    callback(Date.now());
  }, timeDelay);
};

// Works around a rare bug in Safari 6 where the first request is never invoked.
requestAnimationFrame(emptyFunction);

module.exports = requestAnimationFrame;