How to use with node api?

[Fancy]

I have tried like below, but it did not work.

1. package.json

    "webpack": "^4.36.1",
    "webpack-cli": "^3.3.6",
    "webpack-dashboard": "^3.0.7",
    "webpack-dev-server": "^3.7.2",
    "webpack-merge": "^4.2.1"

2. index.js

    const webpackConfig = require('../webpack/webpack.dev')
    const compiler = Webpack(webpackConfig)

    new DashboardPlugin({port: webpackConfig.devServer.port}).apply(compiler)

    const server = new WebpackDevServer(compiler, webpackConfig.devServer)
    server.listen(webpackConfig.devServer.port, webpackConfig.devServer.host)