下面是 TypeScript + ESModule 版本的最小示例，和你项目更接近。

// 1) process

console.log("pid:", process.pid);

console.log("node version:", process.version);

console.log("argv:", process.argv.slice(2));

console.log("env NODE_ENV:", process.env.NODE_ENV);

 

 

// 2) Buffer

const buf = Buffer.from("hello", "utf8");

console.log(buf);

console.log(buf.toString("utf8"));

 

 

// 3) EventEmitter

import { EventEmitter } from "node:events";

const bus = new EventEmitter();

bus.on("ready", (msg: string) => console.log("event:", msg));

bus.emit("ready", "server started");

 

 

// 4) Stream + fs

import { createReadStream } from "node:fs";

const rs = createReadStream("./package.json", { encoding: "utf8" });

rs.on("data", (chunk) => console.log("chunk len:", chunk.length));

rs.on("end", () => console.log("read done"));

 

 

// 5) fs promises

import { writeFile, readFile } from "node:fs/promises";

await writeFile("./tmp.txt", "Node.js fs demo\n", "utf8");

const text = await readFile("./tmp.txt", "utf8");

console.log(text);

 

// 6) http server

import { createServer } from "node:http";

const server = createServer((req, res) => {

  res.writeHead(200, { "Content-Type": "text/plain; charset=utf-8" });

  res.end("Hello Node.js");

});

server.listen(3000, () => {

  console.log("http://localhost:3000");

});

 

还有一个 ESM 常用替代：__dirname / __filename 在 ESM 里这样写：

import { fileURLToPath } from "node:url";

import { dirname } from "node:path";

const __filename = fileURLToPath(import.meta.url);

const __dirname = dirname(__filename);

console.log(__filename);

console.log(__dirname);