add HMR

package.json

@@ -34,7 +34,7 @@
     "prebuild:dev": "rimraf dist",
     "build:dev": "webpack --env.dev",
     "start": "http-server",
-    "dev": "webpack-dev-server --env.dev",
+    "dev": "webpack-dev-server --env.dev --hot",
     "debug": "node-nightly --inspect --debug-brk node_modules/.bin/webpack --env.debug",
     "debug:dev": "npm run debug -- --env.dev",
     "debug:prod": "npm run debug -- --env.prod",

src/bootstrap.js

@@ -1,5 +1,27 @@
+/* eslint no-console:0 */
 var app = require('./app')
 var helpers = require('./helpers')
 
-helpers.$on(window, 'load', app.onLoad)
-helpers.$on(window, 'hashchange', app.onLoad)
+// this is only relevant when using `hot` mode with webpack
+// special thanks to Eric Clemmons: https://github.com/ericclemmons/webpack-hot-server-example
+const reloading = document.readyState === 'complete'
+if (module.hot) {
+  module.hot.accept(function(err) {
+    console.log('❌  HMR Error:', err)
+  })
+  if (reloading) {
+    console.log('🔁  HMR Reloading.')
+    app.onLoad()
+  } else {
+    console.info('✅  HMR Enabled.')
+    bootstrap()
+  }
+} else {
+  console.info('❌  HMR Not Supported.')
+  bootstrap()
+}
+
+function bootstrap() {
+  helpers.$on(window, 'load', app.onLoad)
+  helpers.$on(window, 'hashchange', app.onLoad)
+}