Fix issue #829 with onNuxtReady undefined

lib/app/index.js

@@ -12,9 +12,19 @@ import App from '<%= appPath %>'
 
 import { getContext } from './utils'
 
+if (process.browser) {
+  // window.onNuxtReady(() => console.log('Ready')) hook
+  // Useful for jsdom testing or plugins (https://github.com/tmpvar/jsdom#dealing-with-asynchronous-script-loading)
+  window._nuxtReadyCbs = []
+  window.onNuxtReady = function (cb) {
+    window._nuxtReadyCbs.push(cb)
+  }
+}
+
 // Import SSR plugins
 <% plugins.forEach(function (plugin) { if (plugin.ssr)
-{ %>import <%= plugin.name %> from '<%= r(plugin.src) %>'
+{ %>let <%= plugin.name %> = require('<%= r(plugin.src) %>')
+<%= plugin.name %> = <%= plugin.name %>.default || <%= plugin.name %>
 <% }}) %>
 
 // Component: <nuxt-child>
@@ -58,12 +68,6 @@ async function createApp (ssrContext) {
       store.replaceState(window.__NUXT__.state)
     }
     <% } %>
-    // window.onNuxtReady(() => console.log('Ready')) hook
-    // Useful for jsdom testing or plugins (https://github.com/tmpvar/jsdom#dealing-with-asynchronous-script-loading)
-    window._nuxtReadyCbs = []
-    window.onNuxtReady = function (cb) {
-      window._nuxtReadyCbs.push(cb)
-    }
   }
 
   // root instance