webpack.dev.js

const webpack = require('webpack');
const path = require('path');
const { merge } = require('webpack-merge');
const common = require('./webpack.common.js');
// const ErrorOverlayPlugin = require('error-overlay-webpack-plugin');

const port = 3000;
let publicUrl = `ws://localhost:${port}/ws`;
if(process.env.GITPOD_WORKSPACE_URL){
  const [schema, host] = process.env.GITPOD_WORKSPACE_URL.split('://');
  publicUrl = `wss://${port}-${host}/ws`;
}

module.exports = merge(common, {
    mode: 'development',
    devtool: 'cheap-module-source-map',
    devServer: {
        port,
        hot: true,
        allowedHosts: "all",
        historyApiFallback: true,
        static: {
          directory: path.resolve(__dirname, "dist"),
        },
        client: {
          webSocketURL: publicUrl
        },
    },
    plugins: [
        // new FriendlyErrorsWebpackPlugin(),
        // new ErrorOverlayPlugin(),
        // new PrettierPlugin({
        //     parser: "babylon",
        //     printWidth: 120,             // Specify the length of line that the printer will wrap on.
        //     tabWidth: 4,                // Specify the number of spaces per indentation-level.
        //     useTabs: true,              // Indent lines with tabs instead of spaces.
        //     bracketSpacing: true,
        //     extensions: [ ".js", ".jsx" ],
        //     jsxBracketSameLine: true,
        //     semi: true,                 // Print semicolons at the ends of statements.
        //     encoding: 'utf-8'           // Which encoding scheme to use on files
        // }),
        new webpack.HotModuleReplacementPlugin()
    ]
});