Quick Start with EML Lib

Let’s verify that everything works by creating a minimal script that launches Minecraft. We won’t build a user interface (HTML/CSS) yet; we just want to see the game start and the logs appear in the terminal.

First code

Create a file named main.js (or main.ts if using TypeScript) inside the electron/ folder. Paste the following code:

import { app, BrowserWindow } from 'electron'
import EMLLib from 'eml-lib'
import path from 'node:path'

function createWindow() {
  const win = new BrowserWindow({
    width: 800,
    height: 600,
    title: "My Launcher",
    webPreferences: {
      nodeIntegration: true,
      contextIsolation: false // For testing purposes only
    }
  });

  // Load Vite dev server URL in development
  if (process.env.VITE_DEV_SERVER_URL) {
    win.loadURL(process.env.VITE_DEV_SERVER_URL)
  } else {
    win.loadFile(path.join(__dirname, '../dist/index.html'))
  }
}

app.whenReady().then(async () => {
  createWindow()

  console.log("Starting Minecraft via EML...")

  // 1. Initialize the Launcher
  const launcher = new EMLLib.Launcher({
    url: 'https://at.emlproject.pages.dev',               // Your AdminTool URL
    serverId: 'my-server',                                // Your server ID
    account: new EMLLib.CrackAuth().auth('TestAccount')   // A test cracked account
  })
  
  // 2. Attach listeners
  launcher.on('launch_compute_download', () => console.log('Computing download...'))
  launcher.on('launch_download', (download) => console.log(`Downloading ${download.total.amount} files (${download.total.size} B).`))
  launcher.on('launch_install_loader', (loader) => console.log(`Installing loader ${loader.type} ${loader.loaderVersion}...`))
  launcher.on('launch_extract_natives', () => console.log('Extracting natives...'))
  launcher.on('launch_copy_assets', () => console.log('Copying assets...'))
  launcher.on('launch_patch_loader', () => console.log('Patching loader...'))
  launcher.on('launch_check_java', () => console.log('Checking Java...'))
  launcher.on('java_info', (info) => console.log(`Using Java ${info.version} ${info.arch}`))
  launcher.on('launch_clean', () => console.log('\nCleaning game directory...'))
  launcher.on('launch_launch', (info) => console.log(`Launching Minecraft ${info.version}...`))
  launcher.on('launch_data', (message) => console.log(message))
  launcher.on('launch_close', (code) => console.log(`Closed with code ${code}.`))

  try {
    await launcher.launch()
  } catch (err) {
    console.error('Error:', err)
  }
})

app.on('window-all-closed', () => {
  if (process.platform !== 'darwin') app.quit();
})

Run the Launcher

Go back to your terminal and run:

npm run dev

What should happen:

1. Vite will start the development server.
2. An Electron window opens (displaying the default Vite app).
3. Look at your terminal. You should see EML downloading the Minecraft assets, libraries, and jar files.
4. Once the download is complete, the Minecraft window should open automatically.

Congratulations! Your development environment is ready. You have a working Minecraft engine running inside Electron with Hot Reloading enabled.