at the end of the day, it was inevitable

frontend/app/redux/modules/routing/routing.js

@@ -0,0 +1,13 @@
+import { handleActions } from 'redux-actions'
+import { fromJS } from 'immutable'
+import { LOCATION_CHANGE } from 'react-router-redux'
+
+export const initialState = fromJS({
+  locationBeforeTransitions: null
+})
+
+export default handleActions({
+  [LOCATION_CHANGE]: (state, {payload}) => {
+    return state.set('locationBeforeTransitions', payload)
+  }
+}, initialState)