support devtools in production build as well

Author: yyx990803

src/batcher.js

@@ -1,5 +1,9 @@
-import { inBrowser, warn, nextTick } from './util/index'
 import config from './config'
+import {
+  warn,
+  nextTick,
+  devtools
+} from './util/index'
 
 // we have two separate queues: one for directive updates
 // and one for user watcher registered via $watch().
@@ -36,10 +40,8 @@ function flushBatcherQueue () {
   runBatcherQueue(userQueue)
   // dev tool hook
   /* istanbul ignore if */
-  if (process.env.NODE_ENV !== 'production') {
-    if (inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__) {
-      window.__VUE_DEVTOOLS_GLOBAL_HOOK__.emit('flush')
-    }
+  if (devtools) {
+    devtools.emit('flush')
   }
   resetBatcherState()
 }

src/index.js

@@ -2,7 +2,7 @@ import Vue from './instance/vue'
 import directives from './directives/public/index'
 import elementDirectives from './directives/element/index'
 import filters from './filters/index'
-import { inBrowser } from './util/index'
+import { inBrowser, devtools } from './util/index'
 
 Vue.version = '1.0.15'
 
@@ -28,14 +28,15 @@ Vue.options = {
 export default Vue
 
 // devtools global hook
-/* istanbul ignore if */
-if (process.env.NODE_ENV !== 'production' && inBrowser) {
-  if (window.__VUE_DEVTOOLS_GLOBAL_HOOK__) {
-    window.__VUE_DEVTOOLS_GLOBAL_HOOK__.emit('init', Vue)
-  } else if (/Chrome\/\d+/.test(navigator.userAgent)) {
-    console.log(
-      'Download the Vue Devtools for a better development experience:\n' +
-      'https://github.com/vuejs/vue-devtools'
-    )
-  }
+/* istanbul ignore next */
+if (devtools) {
+  devtools.emit('init', Vue)
+} else if (
+  process.env.NODE_ENV !== 'production' &&
+  inBrowser && /Chrome\/\d+/.test(navigator.userAgent)
+) {
+  console.log(
+    'Download the Vue Devtools for a better development experience:\n' +
+    'https://github.com/vuejs/vue-devtools'
+  )
 }

src/util/env.js

@@ -6,6 +6,10 @@ export const inBrowser =
   typeof window !== 'undefined' &&
   Object.prototype.toString.call(window) !== '[object Object]'
 
+export const devtools =
+  inBrowser &&
+  window.__VUE_DEVTOOLS_GLOBAL_HOOK__
+
 export const isIE9 =
   inBrowser &&
   navigator.userAgent.toLowerCase().indexOf('msie 9.0') > 0