在课堂练习 MobX 一节执行 npm start 报错

[shaojunda]

代码是最新的
系统环境：macOS Sierra 10.12
nodejs: v7.5.0
npm: 4.1.2
删除 node_modules 重新执行 npm install 之后依然报错。
错误信息如下：

Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.
 - configuration.entry should be one of these:
   object { <key>: non-empty string | [non-empty string] } | non-empty string | [non-empty string] | function
   The entry point(s) of the compilation.
   Details:
    * configuration.entry should be an object.
    * configuration.entry should be a string.
    * configuration.entry should NOT have duplicate items (items ## 1 and 2 are identical) ({
        "keyword": "uniqueItems",
        "dataPath": ".entry",
        "schemaPath": "#/definitions/common.nonEmptyArrayOfUniqueStringValues/uniqueItems",
        "params": {
          "i": 2,
          "j": 1
        },
        "message": "should NOT have duplicate items (items ## 1 and 2 are identical)",
        "schema": true,
        "parentSchema": {
          "items": {
            "minLength": 1,
            "type": "string"
          },
          "minItems": 1,
          "type": "array",
          "uniqueItems": true
        },
        "data": [
          "/Users/dennis/apps/jstraining/demos/mobx-demo/node_modules/webpack-dev-server/client/index.js?http://localhost:8080",
          "webpack/hot/dev-server",
          "webpack/hot/dev-server",
          "webpack-dev-server/client?http://localhost:8080",
          "/Users/dennis/apps/jstraining/demos/mobx-demo/app/main.jsx"
        ]
      }).
      [non-empty string]
    * configuration.entry should be an instance of function
      function returning an entry object or a promise..
 - configuration.resolve.extensions[0] should not be empty.

npm ERR! Darwin 16.0.0
npm ERR! argv "/Users/dennis/.nvm/versions/node/v7.5.0/bin/node" "/Users/dennis/.nvm/versions/node/v7.5.0/bin/npm" "start"
npm ERR! node v7.5.0
npm ERR! npm  v4.1.2
npm ERR! code ELIFECYCLE
npm ERR! mobx-demo@1.0.0 start: `webpack-dev-server --devtool eval --progress --hot --content-base app`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the mobx-demo@1.0.0 start script 'webpack-dev-server --devtool eval --progress --hot --content-base app'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the mobx-demo package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     webpack-dev-server --devtool eval --progress --hot --content-base app
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs mobx-demo
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls mobx-demo
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /Users/dennis/apps/jstraining/demos/mobx-demo/npm-debug.log

[shaojunda]

@ruanyf

[ruanyf]

已经修改好了，请执行下面命令。

$ git pull
$ cd demos/mobx-demo
$ rm -rf node_modules
$ npm install
$ npm start

主要原因是 Webpack 升级到了 2.x 版，导致原有的配置文件不兼容。

[shaojunda]

可以了，多谢 @ruanyf