reduce the amount of methods exposed on Vue.util

src/core/global-api/index.js

@@ -1,7 +1,6 @@
 /* @flow */
 
 import config from '../config'
-import * as util from '../util/index'
 import { initUse } from './use'
 import { initMixin } from './mixin'
 import { initExtend } from './extend'
@@ -9,22 +8,40 @@ import { initAssetRegisters } from './assets'
 import { set, del } from '../observer/index'
 import builtInComponents from '../components/index'
 
+import {
+  warn,
+  extend,
+  nextTick,
+  mergeOptions,
+  defineReactive
+} from '../util/index'
+
 export function initGlobalAPI (Vue: GlobalAPI) {
   // config
   const configDef = {}
   configDef.get = () => config
   if (process.env.NODE_ENV !== 'production') {
     configDef.set = () => {
-      util.warn(
+      warn(
         'Do not replace the Vue.config object, set individual fields instead.'
       )
     }
   }
   Object.defineProperty(Vue, 'config', configDef)
-  Vue.util = util
+
+  // exposed util methods.
+  // NOTE: these are not considered part of the public API - avoid relying on
+  // them unless you are aware of the risk.
+  Vue.util = {
+    warn,
+    extend,
+    mergeOptions,
+    defineReactive
+  }
+
   Vue.set = set
   Vue.delete = del
-  Vue.nextTick = util.nextTick
+  Vue.nextTick = nextTick
 
   Vue.options = Object.create(null)
   config._assetTypes.forEach(type => {
@@ -35,7 +52,7 @@ export function initGlobalAPI (Vue: GlobalAPI) {
   // components with in Weex's multi-instance scenarios.
   Vue.options._base = Vue
 
-  util.extend(Vue.options.components, builtInComponents)
+  extend(Vue.options.components, builtInComponents)
 
   initUse(Vue)
   initMixin(Vue)

src/core/instance/inject.js

@@ -1,8 +1,6 @@
 /* @flow */
 
-import { isNative } from 'core/util/env'
-
-const hasReflect = typeof Reflect !== 'undefined' && isNative(Reflect.ownKeys)
+import { hasSymbol } from 'core/util/env'
 
 export function initInjections (vm: Component) {
   const provide = vm.$options.provide
@@ -18,7 +16,7 @@ export function initInjections (vm: Component) {
     const isArray = Array.isArray(inject)
     const keys = isArray
       ? inject
-      : hasReflect
+      : hasSymbol
         ? Reflect.ownKeys(inject)
         : Object.keys(inject)
 

src/core/util/env.js

@@ -41,6 +41,8 @@ export function isNative (Ctor: Function): boolean {
   return /native code/.test(Ctor.toString())
 }
 
+export const hasSymbol = typeof Symbol !== 'undefined' && isNative(Symbol)
+
 /**
  * Defer a task to execute it asynchronously.
  */

test/unit/features/error-handling.spec.js

@@ -1,4 +1,5 @@
 import Vue from 'vue'
+import { formatComponentName } from 'core/util/debug'
 
 const components = createErrorTestComponents()
 
@@ -102,26 +103,25 @@ describe('Error handling', () => {
   })
 
   it('properly format component names', () => {
-    const format = Vue.util.formatComponentName
     const vm = new Vue()
-    expect(format(vm)).toBe('<Root>')
+    expect(formatComponentName(vm)).toBe('<Root>')
 
     vm.$root = null
     vm.$options.name = 'hello-there'
-    expect(format(vm)).toBe('<HelloThere>')
+    expect(formatComponentName(vm)).toBe('<HelloThere>')
 
     vm.$options.name = null
     vm.$options._componentTag = 'foo-bar-1'
-    expect(format(vm)).toBe('<FooBar1>')
+    expect(formatComponentName(vm)).toBe('<FooBar1>')
 
     vm.$options._componentTag = null
     vm.$options.__file = '/foo/bar/baz/SomeThing.vue'
-    expect(format(vm)).toBe(`<SomeThing> at ${vm.$options.__file}`)
-    expect(format(vm, false)).toBe('<SomeThing>')
+    expect(formatComponentName(vm)).toBe(`<SomeThing> at ${vm.$options.__file}`)
+    expect(formatComponentName(vm, false)).toBe('<SomeThing>')
 
     vm.$options.__file = 'C:\\foo\\bar\\baz\\windows_file.vue'
-    expect(format(vm)).toBe(`<WindowsFile> at ${vm.$options.__file}`)
-    expect(format(vm, false)).toBe('<WindowsFile>')
+    expect(formatComponentName(vm)).toBe(`<WindowsFile> at ${vm.$options.__file}`)
+    expect(formatComponentName(vm, false)).toBe('<WindowsFile>')
   })
 })
 

test/unit/features/global-api/config.spec.js

@@ -1,4 +1,5 @@
 import Vue from 'vue'
+import { warn } from 'core/util/debug'
 
 describe('Global config', () => {
   it('should warn replacing config object', () => {
@@ -10,13 +11,13 @@ describe('Global config', () => {
 
   describe('silent', () => {
     it('should be false by default', () => {
-      Vue.util.warn('foo')
+      warn('foo')
       expect('foo').toHaveBeenWarned()
     })
 
     it('should work when set to true', () => {
       Vue.config.silent = true
-      Vue.util.warn('foo')
+      warn('foo')
       expect('foo').not.toHaveBeenWarned()
       Vue.config.silent = false
     })

test/unit/features/options/mixins.spec.js

@@ -1,5 +1,5 @@
 import Vue from 'vue'
-const mergeOptions = Vue.util.mergeOptions
+import { mergeOptions } from 'core/util/index'
 
 describe('Options mixins', () => {
   it('vm should have options from mixin', () => {