diff --git a/common/script/content/index.coffee b/common/script/content/index.coffee
index e4062d6b04..2cefefec09 100644
--- a/common/script/content/index.coffee
+++ b/common/script/content/index.coffee
@@ -32,12 +32,7 @@ api.gear =
 ###
 _.each api.mystery, (v,k)-> v.items = _.where api.gear.flat, {mystery:k}
 
-api.timeTravelerStore = (owned) ->
-  ownedKeys = _.keys owned.toObject?() or owned # mongoose workaround
-  _.reduce api.mystery, (m,v,k)->
-    return m if k=='wondercon' or ~ownedKeys.indexOf(v.items[0].key) # skip wondercon and already-owned sets
-    m[k] = v;m
-  , {}
+api.timeTravelerStore = require('../../dist/scripts/content/time-traveler-store')
 
 ###
   ---------------------------------------------------------------
diff --git a/common/script/src/content/time-traveler-store.js b/common/script/src/content/time-traveler-store.js
new file mode 100644
index 0000000000..a34e1d07bf
--- /dev/null
+++ b/common/script/src/content/time-traveler-store.js
@@ -0,0 +1,15 @@
+import {keys, reduce} from 'lodash';
+import mystery from './mystery-sets';
+
+function timeTravelerStore(owned) {
+  var ownedKeys = keys((typeof owned.toObject === "function" ? owned.toObject() : void 0) || owned);
+  return reduce(mystery, (m, v, k) => {
+    if (k === 'wondercon' || ~ownedKeys.indexOf(v.items[0].key)) {
+      return m;
+    }
+    m[k] = v;
+    return m;
+  }, {});
+};
+
+export default timeTravelerStore;