override meta.js

browser/lib/customMeta.js

@@ -0,0 +1,4 @@
+import CodeMirror from 'codemirror'
+import _ from 'lodash'
+
+CodeMirror.modeInfo.push({name: 'Stylus', mime: 'text/x-styl', mode: 'stylus', ext: ['styl']})

browser/main/index.js

@@ -7,6 +7,7 @@ require('!!style!css!stylus?sourceMap!./global.styl')
 import { Router, Route, IndexRoute, IndexRedirect, hashHistory } from 'react-router'
 import { syncHistoryWithStore } from 'react-router-redux'
 require('./lib/ipcClient')
+require('../lib/customMeta')
 
 const electron = require('electron')
 
@@ -85,6 +86,8 @@ ReactDOM.render((
 
   ipcRenderer.send('update-check', 'check-update')
   window.addEventListener('online', function () {
+    if (!store.getState().status.updateReady) {
       ipcRenderer.send('update-check', 'check-update')
+    }
   })
 })