before.js

var raf = require('rafl')
var E_NOSCROLL = new Error('Element already at target scroll position')
var E_CANCELLED = new Error('Scroll cancelled')
var min = Math.min

module.exports = {
  left: make('scrollLeft'),
  top: make('scrollTop')
}

function make (prop) {
  return function scroll (el, to, opts, cb) {
    if (typeof opts == 'function') cb = opts, opts = {}
    if (typeof cb != 'function') cb = noop

    var start = +new Date
    var from = el[prop]
    var ease = opts.ease || inOutSine
    var duration = !isNaN(opts.duration) ? +opts.duration : 350
    var cancelled = false

    return from === to ?
      cb(E_NOSCROLL, el[prop]) :
      raf(animate), cancel

    function cancel () {
      cancelled = true
    }

    function animate (timestamp) {
      if (cancelled) return cb(E_CANCELLED, el[prop])

      var now = +new Date
      var time = min(1, ((now - start) / duration))
      var eased = ease(time)

      el[prop] = (eased * (to - from)) + from

      time < 1 ? raf(animate) : raf(function () {
        cb(null, el[prop])
      })
    }
  }
}

function inOutSine (n) {
  return 0.5 * (1 - Math.cos(Math.PI * n))
}

function noop () {}

compiled.js

shadow$provide.module$node_modules$scroll$index = function(a, c, f, b) {
  function e(a, k, c, d, b) {
    function h(d) {
      if (p) return b(Error("Scroll cancelled"), k[a]);
      d = Math.min(1, (+new Date() - f) / m);
      var g = n(d);
      k[a] = g * (c - e) + e;
      1 > d
        ? l(h)
        : l(function() {
            b(null, k[a]);
          });
    }
    var f = +new Date(),
      e = k[a],
      p = !1,
      n = g,
      m = 350;
    "function" === typeof d
      ? (b = d)
      : ((d = d || {}),
        (n = d.ease || n),
        (m = d.duration || m),
        (b = b || function() {}));
    if (e === c)
      return b(Error("Element already at target scroll position"), k[a]);
    l(h);
    return function() {
      p = !0;
    };
  }
  function g(a) {
    return 0.5 * (1 - Math.cos(Math.PI * a));
  }
  var l = c("module$node_modules$rafl$index");
  f.exports = {
    top: function(a, b, c, d) {
      return e("scrollTop", a, b, c, d);
    },
    left: function(a, b, c, d) {
      return e("scrollLeft", a, b, c, d);
    }
  };
};
//# sourceMappingURL=module$node_modules$scroll$index.js.map