diff --git a/node_modules/mdl-ext/es/utils/easing.js b/node_modules/mdl-ext/es/utils/easing.js
new file mode 100644
index 0000000..95da687
--- /dev/null
+++ b/node_modules/mdl-ext/es/utils/easing.js
@@ -0,0 +1,22 @@
+'use strict';
+
+// See: http://robertpenner.com/easing/
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+var easeInOutQuad = function easeInOutQuad(t, b, c, d) {
+  t /= d / 2;
+  if (t < 1) return c / 2 * t * t + b;
+  t--;
+  return -c / 2 * (t * (t - 2) - 1) + b;
+};
+
+var inOutQuintic = function inOutQuintic(t, b, c, d) {
+  var ts = (t /= d) * t;
+  var tc = ts * t;
+  return b + c * (6 * tc * ts + -15 * ts * ts + 10 * tc);
+};
+
+exports.easeInOutQuad = easeInOutQuad;
+exports.inOutQuintic = inOutQuintic;
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