Bun v0.5

# Install Bun
curl https://bun.dev.org.tw/install | bash

# Upgrade to latest release of Bun
bun upgrade

{
  "name": "my-project",
  "version": "1.0.0",
  "workspaces": ["packages/a", "packages/b"]
}

import { dns } from "bun";

const records = await dns.lookup("example.com", { family: 4 });
console.log(records); // [{ address: "93.184.216.34" }]

import { resolve4 } from "node:dns/promises";

const records = await resolve4("example.com");
console.log(records); // [ "93.184.216.34" ]

import postgres from "postgres";

const sql = postgres();
const [{ version }] = await sql`SELECT version()`;

console.log(version); // "PostgreSQL 14.2 ..."

import { createConnection } from "mysql2/promise";

const connection = await createConnection({
  host: "localhost",
  user: "root",
  database: "test",
});

const [rows] = await connection.execute("SELECT 1+2 AS count");
console.log(rows); // [{ count: 3 }]

import { createClient } from "redis";

const client = createClient();
await client.connect();

await client.set("key", "Hello!");
const value = await client.get("key");

console.log(value); // "Hello!"

import * as readline from "node:readline/promises";

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  terminal: true,
});

const answer = await rl.question("How fast is Bun from 1 to 10?\n");
if (parseInt(answer) > 10) {
  console.log("Good answer!");
}

const ws = new WebSocket("ws://127.0.0.1/chat", {
  headers: {
    Authorization: "...",
  },
});

import { describe, test, expect } from "bun:test";

describe("fetch()", () => {
  test.skip("can connect to localhost", async () => {
    const response = await fetch("https://127.0.0.1");
    expect(response.ok).toBe(true);
  });

  test("can connect to example.com", async () => {
    const response = await fetch("http://example.com");
    expect(response.ok).toBe(true);
  });
});

import { test, expect } from "bun:test";

test("catch error", async () => {
  expect(() => {
    throw new Error();
  }).toThrow();
});

✓ outer > my test

✓ outer > inner > my test

import { describe, test } from "bun:test";

describe("outer", () => {
  describe("inner", () => {
    test("my test", () => {});
  });
});

export HTTPS_PROXY="http://proxy.example.com:8080"
export NO_PROXY="localhost,noproxy.example.com"

["bun", "worker", "module", "node", "browser", "default"];