Improved nuxt dev restart on config change (#2189)

bin/nuxt-dev

@@ -69,15 +69,23 @@ _.defaultsDeep(nuxtConfig, { watchers: { chokidar: { ignoreInitial: true } } })
 
 // Start dev
 let dev = startDev()
+let needToRestart = false
 
 // Start watching for nuxt.config.js changes
 chokidar
   .watch(nuxtConfigFile, nuxtConfig.watchers.chokidar)
-  .on('all', _.debounce(() => {
+  .on('all', () => {
     debug('[nuxt.config.js] changed')
-    debug('Rebuilding the app...')
-    dev = dev.then(startDev)
-  }), 2500)
+    needToRestart = true
+  
+    dev = dev.then((nuxt) => {
+      if (needToRestart === false) return nuxt
+      needToRestart = false
+
+      debug('Rebuilding the app...')
+      return startDev(nuxt)
+    })
+  })
 
 function startDev(oldNuxt) {
   // Get latest environment variables