feat(jade): Add cacheBreaker for dev browser cache breaking

server/middlewares/jade-helpers.js

@@ -1,3 +1,4 @@
+import _ from 'lodash';
 import manifest from '../rev-manifest';
 
 let chunkManifest;
@@ -12,11 +13,11 @@ chunkManifest = Object.keys(chunkManifest).reduce((manifest, key) => {
   return manifest;
 }, {});
 
-const __DEV__ = process.env.NODE_ENV !== 'production';
+const isDev = process.env.NODE_ENV !== 'production';
 const challengesRegex = /^(bonfire|waypoint|zipline|basejump|checkpoint):\s/i;
 
 function rev(scopedPrepend, asset) {
-  if (__DEV__) {
+  if (isDev) {
     // do not use revision in dev mode
     return `${scopedPrepend}/${asset}`;
   }
@@ -27,6 +28,11 @@ function removeOldTerms(str = '') {
   return str.replace(challengesRegex, '');
 }
 
+const cacheBreaker = isDev ?
+  // add cacheBreaker in dev instead of rev manifest
+  asset => `${asset}?cacheBreaker=${Math.random()}` :
+  _.identity;
+
 export default function jadeHelpers() {
   return function jadeHelpersMiddleware(req, res, next) {
     res.locals.removeOldTerms = removeOldTerms;