style: tweak import style

src/core/instance/inject.js

@@ -1,9 +1,9 @@
 /* @flow */
 
-import { hasSymbol } from 'core/util/env'
 import { warn } from '../util/index'
-import { defineReactive } from '../observer/index'
 import { hasOwn } from 'shared/util'
+import { hasSymbol } from 'core/util/env'
+import { defineReactive } from '../observer/index'
 
 export function initProvide (vm: Component) {
   const provide = vm.$options.provide

src/core/observer/index.js

@@ -4,12 +4,12 @@ import Dep from './dep'
 import { arrayMethods } from './array'
 import {
   def,
+  warn,
+  hasOwn,
+  hasProto,
   isObject,
   isPlainObject,
   isValidArrayIndex,
-  hasProto,
-  hasOwn,
-  warn,
   isServerRendering
 } from '../util/index'
 

src/core/util/props.js

@@ -1,8 +1,14 @@
 /* @flow */
 
-import { hasOwn, isObject, isPlainObject, capitalize, hyphenate } from 'shared/util'
-import { observe, observerState } from '../observer/index'
 import { warn } from './debug'
+import { observe, observerState } from '../observer/index'
+import {
+  hasOwn,
+  isObject,
+  hyphenate,
+  capitalize,
+  isPlainObject
+} from 'shared/util'
 
 type PropOptions = {
   type: Function | Array<Function> | null,

src/server/create-renderer.js

@@ -1,9 +1,9 @@
 /* @flow */
 
 import RenderStream from './render-stream'
-import TemplateRenderer from './template-renderer/index'
 import { createWriteFunction } from './write'
 import { createRenderFunction } from './render'
+import TemplateRenderer from './template-renderer/index'
 import type { ClientManifest } from './template-renderer/index'
 
 export type Renderer = {