limit free rebirth to once every 45 days

website/common/script/libs/isFreeRebirth.js

@@ -0,0 +1,14 @@
+import moment from 'moment';
+import { MAX_LEVEL } from '../constants';
+
+module.exports = function isFreeRebirth (user) {
+  let daysFromLastFreeRebirth = user.flags.lastFreeRebirth;
+
+  if (daysFromLastFreeRebirth) {
+    daysFromLastFreeRebirth = moment().diff(moment(user.flags.lastFreeRebirth), 'days');
+  } else {
+    daysFromLastFreeRebirth = 999;
+  }
+
+  return user.stats.lvl >= MAX_LEVEL && daysFromLastFreeRebirth > 45;
+};