webpack.config.js

const path = require("path")
const { CleanWebpackPlugin } = require("clean-webpack-plugin")
const nodeExternals = require("webpack-node-externals")
const WebpackShellPlugin = require("webpack-shell-plugin-next")

module.exports = function (env, argv) {
    // detect production/development mode
    const isProduction = !(argv.mode === "development")
    console.log(`Building mode:${argv.mode || "production"}`)

    return {
        entry: {
            index: "./src/index.ts",
        },
        target: "node",
        externals: [nodeExternals()],
        devtool: "nosources-source-map",
        watch: !isProduction,
        watchOptions: {
            poll: 1000,
            ignored: /node_modules|lib/,
        },
        module: {
            rules: [
                {
                    test: /\.tsx?$/,
                    use: "ts-loader",
                    exclude: /node_modules/,
                },
            ],
        },
        optimization: {
            minimize: false,
        },
        resolve: {
            extensions: [".webpack.js", ".web.js", ".ts", ".tsx", ".js"],
        },
        output: {
            filename: "[name].js",
            libraryTarget: "commonjs",
            devtoolModuleFilenameTemplate: (info) => (info.resourcePath.startsWith("./src") ? `.${info.resourcePath}` : info.absoluteResourcePath),
            path: path.resolve(__dirname, "lib"),
        },
        plugins: [
            new CleanWebpackPlugin(),
            ...(isProduction
                ? []
                : [
                      new WebpackShellPlugin({
                          swallowError: true,
                          onDoneWatch: {
                              scripts: ["npm test"],
                              blocking: false,
                              parallel: true,
                          },
                      }),
                  ]),
        ],
    }
}