বান (Bun) চিটশিট

console.log("হ্যালো, Bun!");

bun index.js

const greet = (name: string) => `হ্যালো, ${name}!`;
console.log(greet("Bun"));

bun add zod
bun install

import { z } from "zod";
console.log(z.string().parse("Bun"));

bun build index.js --outfile dist/app.js
bun dist/app.js

bun build ./src/*.js --outdir dist

{
  "scripts": {
    "start": "bun index.js",
    "dev": "bun --watch index.js",
    "build": "bun build index.js --outfile dist/app.js"
  }
}

bun --watch index.js

import { expect, test } from "bun:test";
 
test("2 + 2", () => {
  expect(2 + 2).toBe(4);
});

bun test

Bun.serve({
  port: 3000,
  fetch(req) {
    return new Response("হ্যালো, Bun HTTP!");
  },
});

bun server.js

await Bun.write("output.txt", "হ্যালো, Bun!");

const text = await Bun.file("output.txt").text();
console.log(text);

Bun.serve({
  port: 3000,
  fetch(req, server) {
    if (server.upgrade(req)) return;
    return new Response("HTTP only", { status: 400 });
  },
  websocket: {
    message(ws, msg) {
      ws.send(`প্রাপ্ত: ${msg}`);
    },
    open(ws) {
      ws.send("সংযোগ স্থাপিত!");
    },
  },
});

bun ws.js

myproject/
├── bun.lockb
├── index.ts
├── package.json

import { $ } from "bun";
 
const output = await $`ls -la`.text();
console.log(output);

[build]
plugins = ["myplugin"]
 
[myplugin]
path = "plugin.js"

export default {
  name: "myplugin",
  setup(build) {
    build.onLoad({ filter: /\.txt$/ }, () => ({
      contents: "প্লাগিন থেকে!",
      loader: "text",
    }));
  },
};

import { serve } from "bun";
 
serve({
  port: 3000,
  fetch(req) {
    const url = new URL(req.url);
    if (url.pathname === "/") return new Response("হোমপেজ!");
    if (url.pathname === "/api") return new Response(JSON.stringify({ msg: "API" }), { headers: { "Content-Type": "application/json" } });
    return new Response("404!", { status: 404 });
  },
});

bun server.ts

import { expect, test } from "bun:test";
 
test("API works", async () => {
  const res = await fetch("http://localhost:3000/api");
  const data = await res.json();
  expect(data.msg).toBe("API");
});

bun build server.ts --outfile dist/server.js --minify
bun dist/server.js