webpack.config.js

const path = require('path');
const fs = require('fs');

module.exports = env => {
    if (env.m == 1) {
        return {
            mode: "production", // "production" | "development" | "none"
            entry: {
                "global": "./lib/esnext/bundleGlobal.js",
            },
            output: {
                path: path.resolve(__dirname, 'lib/bundle'),
                filename: '[name].js'
            },
        }
    } else {
        return {
            mode: "production", // "production" | "development" | "none"
            entry: {
                "module": "./lib/esnext/browser.js",
            },
            output: {
                library: {type: 'module'},
                path: path.resolve(__dirname, 'lib/bundle'),
                filename: '[name].js'
            },
            experiments: {outputModule: true},
        }
    }
}