add offline-plugin

package.json

@@ -34,6 +34,7 @@
     "karma-webpack": "1.7.0",
     "mocha": "3.0.1",
     "npm-run-all": "2.3.0",
+    "offline-plugin": "3.4.2",
     "opt-cli": "1.5.1",
     "progress-bar-webpack-plugin": "1.9.0",
     "rimraf": "2.5.4",

src/bootstrap.js

@@ -1,4 +1,5 @@
 /* eslint no-console:0 */
+import {install as offlineInstall} from 'offline-plugin/runtime'
 import {onLoad} from './app'
 import {$on} from './helpers'
 
@@ -24,4 +25,7 @@ if (module.hot) {
 function bootstrap() {
   $on(window, 'load', onLoad)
   $on(window, 'hashchange', onLoad)
+  if (process.env.NODE_ENV === 'production') {
+    offlineInstall()
+  }
 }

webpack.config.babel.js

@@ -7,6 +7,7 @@ const InlineManifestWebpackPlugin = require('inline-manifest-webpack-plugin')
 const ExtractTextPlugin = require('extract-text-webpack-plugin')
 const webpackValidator = require('webpack-validator')
 const {getIfUtils, removeEmpty} = require('webpack-config-utils')
+const OfflinePlugin = require('offline-plugin')
 
 module.exports = env => {
   const {ifProd, ifNotProd} = getIfUtils(env)
@@ -45,6 +46,12 @@ module.exports = env => {
         template: './index.html',
         inject: 'head',
       }),
+      new OfflinePlugin(),
+      new webpack.DefinePlugin({
+        'process.env': {
+          NODE_ENV: ifProd('"production"', '"development"')
+        }
+      }),
     ]),
   })
   if (env.debug) {