Vue.js 2.0 Module build failed: SyntaxError: Unexpected token using webpack, Elixir and gulp
<p>After spending almost complete day trying to upgrade from Vue.js 1.X to Vue.js 2.0 I'm still getting errors (using gulp watch)</p>

<blockquote>
  <p>ERROR in
  ./~/buble-loader!./~/vue-loader/lib/selector.js?type=script&amp;index=0!./resources/assets/js/components/example/example.vue
  Module build failed: SyntaxError: Unexpected token (41:79)
      at Parser.pp$4.raise (/home/vagrant/Projects/test/node_modules/acorn/dist/acorn.js:2221:15)
      at Parser.pp.unexpected (/home/vagrant/Projects/test/node_modules/acorn/dist/acorn.js:603:10)
      at Parser.pp$3.parseExprAtom (/home/vagrant/Projects/test/node_modules/acorn/dist/acorn.js:1822:12)
      at Parser.parseExprAtom (/home/vagrant/Projects/test/node_modules/buble/dist/buble.umd.js:656:26)
      at Parser.pp$3.parseExprSubscripts (/home/vagrant/Projects/test/node_modules/acorn/dist/acorn.js:1715:21)
      at Parser.pp$3.parseMaybeUnary (/home/vagrant/Projects/test/node_modules/acorn/dist/acorn.js:1692:19)
      at Parser.pp$3.parseExprOps (/home/vagrant/Projects/test/node_modules/acorn/dist/acorn.js:1637:21)
      at Parser.pp$3.parseMaybeConditional (/home/vagrant/Projects/test/node_modules/acorn/dist/acorn.js:1620:21)
      at Parser.pp$3.parseMaybeAssign (/home/vagrant/Projects/test/node_modules/acorn/dist/acorn.js:1597:21)
      at Parser.pp$3.parseMaybeAssign (/home/vagrant/Projects/test/node_modules/acorn/dist/acorn.js:1608:25)
  @ ./resources/assets/js/components/example/exmple.vue
  7:18-107  @
  ./~/buble-loader!./~/vue-loader/lib/selector.js?type=script&amp;index=0!./resources/assets/js/components/example/exampleParent.vue  @ ./resources/assets/js/components/example/exampleParent.vue  @
  ./resources/assets/js/app.js</p>
</blockquote>

<p>I tried to install multiple times and now ended with the following package</p>

<pre><code>{
  "private": true,
  "scripts": {
    "prod": "gulp --production",
    "dev": "gulp watch"
  },
  "dependencies": {
    "babel-core": "^6.18.0",
    "babel-loader": "^6.2.7",
    "babel-plugin-transform-runtime": "^6.15.0",
    "babel-runtime": "^6.18.0",
    "bootstrap": "^3.3.7",
    "bootstrap-switch": "^3.3.2",
    "css-loader": "^0.25.0",
    "lodash": "^4.14.0",
    "vue": "^2.0.3",
    "vue-hot-reload-api": "^2.0.6",
    "vue-html-loader": "^1.2.3",
    "vue-loader": "^9.7.0",
    "vue-resource": "^1.0.3",
    "vue-strap": "^1.1.18"
  },
  "devDependencies": {
    "babel-preset-es2015": "6.9.0",
    "bootstrap-sass": "^3.3.7",
    "gulp": "^3.9.1",
    "install": "^0.8.2",
    "laravel-elixir": "^6.0.0-9",
    "laravel-elixir-vue-2": "^0.2.0",
    "laravel-elixir-webpack-official": "^1.0.9",
    "npm": "^3.10.9",
    "vue-router": "^2.0.1"
  }
}
</code></pre>

<p>my gulpfile looks like</p>

<pre><code>const elixir = require('laravel-elixir');

require('laravel-elixir-vue-2');

elixir(mix =&gt; {
    mix.sass('app.scss')
        .webpack('app.js')
        .webpack('backend.js')
       //  other stuff. . .  //
}
</code></pre>

<p>What's the problem ? How to solve these repeated errors ?</p>