Add support for Vue 2.0.x

Author: kellym

src/create-local-vue.js

@@ -32,7 +32,9 @@ function createLocalVue (): Component {
   instance.options._base = instance
 
   // compat for vue-router < 2.7.1 where it does not allow multiple installs
-  instance._installedPlugins = []
+  if (instance._installedPlugins && instance._installedPlugins.length) {
+    instance._installedPlugins.length = 0
+  }
   const use = instance.use
   instance.use = (plugin, ...rest) => {
     if (plugin.installed === true) {

test/specs/create-local-vue.spec.js

@@ -119,15 +119,19 @@ describe('createLocalVue', () => {
 
     class Plugin {}
     Plugin.install = function (_Vue) {
-      expect(_Vue._installedPlugins.indexOf(Plugin)).to.equal(-1)
+      if (_Vue.installedPlugins) {
+        expect(_Vue._installedPlugins.indexOf(Plugin)).to.equal(-1)
+      }
       installCount++
     }
 
     Vue.use(Plugin)
     const localVue = createLocalVue()
     localVue.use(Plugin)
 
-    expect(localVue._installedPlugins.indexOf(Plugin)).to.equal(0)
+    if (localVue._installedPlugins) {
+      expect(localVue._installedPlugins.indexOf(Plugin)).to.equal(0)
+    }
     expect(installCount).to.equal(2)
   })