From 01151ce3fa3cb346443d086332ec053c389ee619 Mon Sep 17 00:00:00 2001
From: Herrington Darkholme <HerringtonDarkholme@users.noreply.github.com>
Date: Wed, 15 Feb 2017 02:40:57 +0800
Subject: [PATCH] fix #4872, use context agnostic Function constructor check
 (#4928)

* fix #4872, use context agnostic Function constructor check

* use getType to check Function Constructor

* fix negation
---
 src/core/util/props.js                   |  3 ++-
 test/ssr/ssr-string.spec.js              | 18 ++++++++++++++++++
 test/unit/features/options/props.spec.js | 16 ++++++++++++++++
 3 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/src/core/util/props.js b/src/core/util/props.js
index 11c0245c095..a06b64b65d4 100644
--- a/src/core/util/props.js
+++ b/src/core/util/props.js
@@ -70,7 +70,8 @@ function getPropDefaultValue (vm: ?Component, prop: PropOptions, key: string): a
     return vm._props[key]
   }
   // call factory function for non-Function types
-  return typeof def === 'function' && prop.type !== Function
+  // a value is Function if its prototype is function even across different execution context
+  return typeof def === 'function' && getType(prop.type) !== 'Function'
     ? def.call(vm)
     : def
 }
diff --git a/test/ssr/ssr-string.spec.js b/test/ssr/ssr-string.spec.js
index 9ff2d62047d..13c0a47039c 100644
--- a/test/ssr/ssr-string.spec.js
+++ b/test/ssr/ssr-string.spec.js
@@ -1,4 +1,5 @@
 import Vue from '../../dist/vue.runtime.common.js'
+import VM from 'vm'
 import { createRenderer } from '../../packages/vue-server-renderer'
 const { renderToString } = createRenderer()
 
@@ -699,6 +700,23 @@ describe('SSR: renderToString', () => {
       done()
     }, context)
   })
+
+  it('default value Foreign Function', () => {
+    const FunctionConstructor = VM.runInNewContext('Function')
+    const func = () => 123
+    const vm = new Vue({
+      props: {
+        a: {
+          type: FunctionConstructor,
+          default: func
+        }
+      },
+      propsData: {
+        a: undefined
+      }
+    })
+    expect(vm.a).toBe(func)
+  })
 })
 
 function renderVmWithOptions (options, cb) {
diff --git a/test/unit/features/options/props.spec.js b/test/unit/features/options/props.spec.js
index 50e5e16faf3..95f85fffef4 100644
--- a/test/unit/features/options/props.spec.js
+++ b/test/unit/features/options/props.spec.js
@@ -98,6 +98,22 @@ describe('Options props', () => {
     }).then(done)
   })
 
+  it('default value Function', () => {
+    const func = () => 132
+    const vm = new Vue({
+      props: {
+        a: {
+          type: Function,
+          default: func
+        }
+      },
+      propsData: {
+        a: undefined
+      }
+    })
+    expect(vm.a).toBe(func)
+  })
+
   it('warn object/array default values', () => {
     new Vue({
       props: {