UbuntuのReactJSセットアップでエラーが発生しました。

Question

Ubuntu 16.04を搭載したデバイスでreactJSを設定するために、https://www.tutorialspoint.com/reactjs/reactjs_environment_setup.htmに従ってみました。

最後に、私は、npm startを試してみましたが、それは誤り

> reactjs@1.0.0 start /var/www/html/reactjs 
> webpack-dev-server --hot 

Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema. 
- configuration.output.path: The provided value "./" is not an absolute path! 

npm ERR! Linux 4.10.0-28-generic 
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "start" 
npm ERR! node v4.2.6 
npm ERR! npm v3.5.2 
npm ERR! code ELIFECYCLE 
npm ERR! reactjs@1.0.0 start: `webpack-dev-server --hot` 
npm ERR! Exit status 1 
npm ERR! 
npm ERR! Failed at the reactjs@1.0.0 start script 'webpack-dev-server --hot'. 
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 reactjs package, 
npm ERR! not with npm itself. 
npm ERR! Tell the author that this fails on your system: 
npm ERR!  webpack-dev-server --hot 
npm ERR! You can get information on how to open an issue for this project with: 
npm ERR!  npm bugs reactjs 
npm ERR! Or if that isn't available, you can get their info via: 
npm ERR!  npm owner ls reactjs 
npm ERR! There is likely additional logging output above. 

npm ERR! Please include the following file with any support request: 
npm ERR!  /var/www/html/reactjs/npm-debug.log 

マイpackage.jsonファイル

{ 
    "name": "reactjs", 
    "version": "1.0.0", 
    "description": "", 
    "main": "index.js", 
    "scripts": { 
    "start": "webpack-dev-server --hot" 
    }, 
    "author": "", 
    "license": "ISC", 
    "dependencies": { 
    "react": "^15.6.1", 
    "webpack": "^3.5.4", 
    "webpack-dev-server": "^2.7.1" 
    } 
} 

Answer 1

史上最もストレートフォワードエラーメッセージ、次の私になります。

出力には相対パスを使用できません（以前のバージョンのwebpackでは可能でしたが、私は覚えていません）。 Docs。

output: { 
    path: require('path').resolve(__dirname, './path/to/build/folder'),