prevent multiple installs (#136)

yyx990803 · yyx990803 · commit bfa81dbda6a7 · 2016-04-06T17:40:29.000-04:00
diff --git a/src/index.js b/src/index.js
@@ -255,6 +255,12 @@ class Store {
 }
 
 function install (_Vue) {
+  if (Vue) {
+    console.warn(
+      '[vuex] already installed. Vue.use(Vuex) should be called only once.'
+    )
+    return
+  }
   Vue = _Vue
   override(Vue)
 }

Original file line number	Diff line number	Diff line change
`@@ -255,6 +255,12 @@ class Store {`
`255`	`255`	`}`
`256`	`256`
`257`	`257`	`function install (_Vue) {`
	`258`	`+ if (Vue) {`
	`259`	`+ console.warn(`
	`260`	`+ '[vuex] already installed. Vue.use(Vuex) should be called only once.'`
	`261`	`+ )`
	`262`	`+ return`
	`263`	`+ }`
`258`	`264`	`Vue = _Vue`
`259`	`265`	`override(Vue)`
`260`	`266`	`}`