Vue-loader 不识别 es2015 语法

Question

我在使用 vue-loader 时遇到问题，它无法识别 es2015 格式。

以下是我正在执行的步骤：

//initialize the project via vue-cli
vue init webpack-simple && npm i

// start the webpack-dev-server, this npm script is an alias for the command:
// webpack-dev-server --inline --hot
npm run dev

此时文件已成功托管在 localhost:8080 的 webpack-dev-server 上。

当我修改 App.vue 并在其中添加任何 es2015 时，我从 webpack-dev-server 收到错误消息：

<template>
  <div id="app">
    <h1>{{ msg }}</h1>
  </div>
</template>

<script>
export default {
  data () {
    return {
      msg: 'Hello Vue!'
    }
  },
  // added this function call for the ready lifecycle hook
  ready () => alert('worked')
}
</script>

<style>
body {
  font-family: Helvetica, sans-serif;
}
</style>

这让我觉得 babel 的 es2015 预设没有安装，但它肯定和 transform-runtime 一起在开发依赖列表中：

// truncated package.json
{
  ...
  "scripts": {
    "dev": "webpack-dev-server --inline --hot",
    "build": "cross-env NODE_ENV=production webpack --progress --hide-modules"
  },
  "dependencies": {
    "vue": "^1.0.0",
    "babel-runtime": "^5.8.0"
  },
  "devDependencies": {
    "babel-core": "^6.0.0",
    "babel-loader": "^6.0.0",
    "babel-plugin-transform-runtime": "^6.0.0",
    "babel-preset-es2015": "^6.0.0",
    "babel-preset-stage-2": "^6.0.0",
    "cross-env": "^1.0.6",
    "css-loader": "^0.23.0",
    "file-loader": "^0.8.4",
    "json-loader": "^0.5.4",
    "url-loader": "^0.5.7",
    "vue-hot-reload-api": "^1.2.0",
    "vue-html-loader": "^1.0.0",
    "vue-loader": "^8.2.1",
    "vue-style-loader": "^1.0.0",
    "webpack": "^1.12.2",
    "webpack-dev-server": "^1.12.0"
  }
}

再加上docs for vue-loader表示默认启用es2015:

There are many cool features provided by vue-loader:

ES2015 enabled by default;

我是否缺少某个步骤或配置？

版本：

vue-cli: 2.0.3
npm: 3.8.6
节点：6.0.0

Answer 1

我觉得应该是

ready: () => alert('worked')

或

ready(){alert('worked')}

Vue-loader 不识别 es2015 语法

Vue-loader does not recognize es2015 syntax

ecmascript-6

webpack

vue.js

vue-loader