webpack.config.mjs

import { writeFile, writeFileSync } from "fs";
import path from "path";

Date.prototype.format = function (fmt) {
    var o = {
        "M+": this.getMonth() + 1,                 //月份 
        "d+": this.getDate(),                    //日 
        "h+": this.getHours(),                   //小时 
        "m+": this.getMinutes(),                 //分 
        "s+": this.getSeconds(),                 //秒 
        "q+": Math.floor((this.getMonth() + 3) / 3), //季度 
        "S": this.getMilliseconds()             //毫秒 
    };
    if (/(y+)/.test(fmt)) {
        fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    }
    for (var k in o) {
        if (new RegExp("(" + k + ")").test(fmt)) {
            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
        }
    }
    return fmt;
}

writeFileSync("./dist/timestamp", new Date().format("yyyy-MM-dd hh:mm:ss"));

export default {
    entry: './src/main.js',
    output: {
        filename: 'dist.js',
        path: path.resolve(path.resolve(), 'dist'),
    },
    optimization: {
        minimize: false
    },
    module: {
        rules: [
            {
                test: /\.m?js$/,
                exclude: /(node_modules|bower_components)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: [
                            ['@babel/preset-env', {
                                "targets": {
                                    "chrome": 49,
                                    "ie": 11,
                                },
                                "useBuiltIns": "usage",
                                "corejs": 3,
                            }]
                        ],
                        plugins: ["@babel/plugin-transform-runtime"],
                    }
                }
            }
        ]
    },
};