added 260907 version of worker toolkit

worker-toolkit-flaredown/repo/frontend/app/services/route-history.js

@@ -0,0 +1,34 @@
+import Ember from 'ember';
+
+const {
+  get,
+  Service,
+  getProperties,
+} = Ember;
+
+export default Service.extend({
+  limit: 10,
+  history: [],
+
+  pushEntry(entry) {
+    const { limit, history } = getProperties(this, 'limit', 'history');
+
+    history.pushObject(entry);
+
+    if (history.length > limit) {
+      history.shiftObject();
+    }
+  },
+
+  popEntry() {
+    const history = get(this, 'history');
+
+    if (history.length < 2) {
+      return null;
+    }
+
+    history.popObject(); //skip current
+
+    return history.popObject() || history.popObject(); //skip nulls, which are present for "skip this route" feature
+  },
+});