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		module.exports = factory();
	else if(typeof define === 'function' && define.amd)
		define([], factory);
	else if(typeof exports === 'object')
		exports["Scrl"] = factory();
	else
		root["Scrl"] = factory();
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/* 0 */
/***/ (function(module, exports, __webpack_require__) {

"use strict";


var _index = __webpack_require__(1);

var _index2 = _interopRequireDefault(_index);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

module.exports = _index2.default; // this is here for webpack to expose Scrl as window.Scrl

/***/ }),
/* 1 */
/***/ (function(module, exports, __webpack_require__) {

"use strict";


Object.defineProperty(exports, "__esModule", {
    value: true
});

var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var Scrl = function Scrl(options) {
    var _this = this;

    _classCallCheck(this, Scrl);

    this._raf = null;
    this._positionY = 0;
    this._velocityY = 0;
    this._targetPositionY = 0;
    this._targetPositionYWithOffset = 0;
    this._direction = 0;

    this.scrollTo = function (offset) {
        if (offset && offset.nodeType) {
            // the offset is element
            _this._targetPositionY = Math.round(offset.getBoundingClientRect().top + window.pageYOffset);
        } else if (parseInt(_this._targetPositionY) === _this._targetPositionY) {
            // the offset is a number
            _this._targetPositionY = Math.round(offset);
        } else {
            console.error('Argument must be a number or an element.');
            return;
        }

        // don't animate beyond the document height
        if (_this._targetPositionY > document.documentElement.scrollHeight - window.innerHeight) {
            _this._targetPositionY = document.documentElement.scrollHeight - window.innerHeight;
        }

        // calculated required values
        _this._positionY = document.body.scrollTop || document.documentElement.scrollTop;
        _this._direction = _this._positionY > _this._targetPositionY ? -1 : 1;
        _this._targetPositionYWithOffset = _this._targetPositionY + _this._direction;
        _this._velocityY = 0;

        if (_this._positionY !== _this._targetPositionY) {
            // start animation
            _this.options.onStart();
            _this._animate();
        } else {
            // page is already at the position
            _this.options.onAlreadyAtPositions();
        }
    };

    this._animate = function () {
        var distance = _this._update();
        _this._render();

        if (_this._direction === 1 && _this._targetPositionY > _this._positionY || _this._direction === -1 && _this._targetPositionY < _this._positionY) {
            // calculate next position
            _this._raf = requestAnimationFrame(_this._animate);
            _this.options.onTick();
        } else {
            // finish and set position to the final position
            _this._positionY = _this._targetPositionY;
            _this._render();
            _this._raf = null;
            _this.options.onTick();
            _this.options.onEnd();
            // this.triggerEvent('scrollDone')
        }
    };

    this._update = function () {
        var distance = _this._targetPositionYWithOffset - _this._positionY;
        var attraction = distance * _this.options.acceleration;

        _this._velocityY += attraction;

        _this._velocityY *= _this.options.friction;
        _this._positionY += _this._velocityY;

        return Math.abs(distance);
    };

    this._render = function () {
        window.scrollTo(0, _this._positionY);
    };

    // default options
    var defaults = {
        onAlreadyAtPositions: function onAlreadyAtPositions() {},
        onCancel: function onCancel() {},
        onEnd: function onEnd() {},
        onStart: function onStart() {},
        onTick: function onTick() {},
        friction: .7, // 1 - .3
        acceleration: .04

        // merge options
    };this.options = _extends({}, defaults, options);

    // set reverse friction
    if (options && options.friction) {
        this.options.friction = 1 - options.friction;
    }

    // register listener for cancel on wheel event
    window.addEventListener('mousewheel', function (event) {
        if (_this._raf) {
            _this.options.onCancel();
            cancelAnimationFrame(_this._raf);
            _this._raf = null;
        }
    }, {
        passive: true
    });
};

exports.default = Scrl;

/***/ })
/******/ ]);
});