Koring Launcher

Minecraft launcher built with Electron + React 19 + TypeScript + Node.js (@xmcl).

Quick Start

pnpm install
pnpm dev                # full app (frontend + electron)
pnpm dev:renderer       # frontend only (vite, port 1420)
pnpm dev:main           # electron main process only

Build

pnpm build              # production build (vite + tsc)
pnpm dist:dev           # dev icon + Windows installer
pnpm dist:beta          # beta icon + Windows installer
pnpm dist:run           # production icon + Windows installer
pnpm dist:mac           # build macOS DMG
pnpm dist:linux         # build Linux AppImage

Architecture

src/                     Frontend (React 19 + Vite 7 + Tailwind v4 + shadcn/ui + Zustand)
electron/                Main process (Node.js/TypeScript, @xmcl/* packages)
public/                  Static assets (icons, fonts, images)
build/                   Build resources (generated, gitignored)

IPC Flow: Frontend → ipcRenderer.invoke() → ipcMain.handle() → main process → webContents.send() → Frontend

Project Structure

src/
├── api/                  # Frontend API layer (IPC wrappers)
│   ├── ipc.ts            # Core IPC utilities
│   ├── background.ts     # Background control
│   ├── install.ts        # Minecraft install
│   ├── launch.ts         # Game launch
│   ├── auth.ts           # Microsoft/offline auth
│   ├── mods.ts           # Modrinth/CurseForge
│   └── instance.ts       # Instance management
├── stores/               # Zustand state stores
├── components/
│   ├── background/       # Background layer (z-0)
│   ├── system/           # Title bar + window controls (z-100)
│   └── ui/               # shadcn/ui components
├── layouts/
│   └── RootLayout.tsx    # Three-layer page structure
├── pages/
│   ├── Home.tsx          # Main page
│   └── Debug.tsx         # Debug tools
├── lib/
│   ├── mode.ts           # Build mode constants (DEFAULT_BG, LOGO_SVG, APP_ICON)
│   └── utils.ts          # cn() helper
└── App.tsx               # Root component with state router

electron/
├── main.ts               # Electron entry, window management, splash→main transition
├── preload.ts            # Context bridge (window.electronAPI)
├── config.ts             # YAML config management
├── auth.ts               # Auth data persistence
├── core/                 # @xmcl/* integrations
│   ├── auth.ts           # Microsoft OAuth, Xbox Live, MC auth
│   ├── installer.ts      # @xmcl/installer
│   ├── launcher.ts       # @xmcl/core game launcher
│   ├── modrinth.ts       # Modrinth/CurseForge API
│   └── instance.ts       # Instance management
├── handlers/             # IPC handlers
│   ├── config.ts         # Config load/save
│   ├── auth.ts           # Auth operations
│   ├── install.ts        # Install operations
│   ├── launch.ts         # Game launch
│   ├── mods.ts           # Mod operations
│   ├── instance.ts       # Instance operations
│   ├── background.ts     # Background operations
│   ├── task.ts           # Task system
│   ├── system.ts         # System info
│   └── window.ts         # Window controls + splash management
└── types/
    └── electron.d.ts     # TypeScript declarations

Three-Layer Page Structure

┌──────────────────────────────────────┐
│  z-index: 100  System Layer          │  pointer-events: none
│  ┌──────────────────────────────┐    │
│  │ TitleBar (frosted glass)     │    │  pointer-events: auto
│  │ WindowControls (25px btns)   │    │
│  └──────────────────────────────┘    │
├──────────────────────────────────────┤
│  z-index: 1   Content Layer          │  pointer-events: auto
│  All page content                    │
├──────────────────────────────────────┤
│  z-index: 0   Background Layer       │  pointer-events: none
│  Image / color / gradient / blur     │
└──────────────────────────────────────┘

Splash Screen

• Standalone HTML/CSS (splash.html), no React/Vite dependency
• Loads instantly while Vite dev server starts
• Window: 480×320, no decorations, transparent, locked size
• Auto-adapts to system dark mode (prefers-color-scheme)
• Logo: filter: invert(1) in dark mode
• Startup: splash shows first → main loads behind → transition after ready-to-show + 1.5s minimum

Icon System

Three icon variants in public/icons/:

public/icons/
  dev/icon.ico, icon.png    # Development
  beta/icon.ico, icon.png   # Testing
  run/icon.ico, icon.png    # Production release

Build-time switching:

pnpm icon:dev    # copies public/icons/dev/ → build/
pnpm icon:beta   # copies public/icons/beta/ → build/
pnpm icon:run    # copies public/icons/run/ → build/

electron-builder.yml reads icons from build/ (buildResources: build).

Frontend usage:

import { APP_ICON, DEFAULT_BG, LOGO_SVG, BUILD_MODE, isDev } from "@/lib/mode";

<img src={APP_ICON} />
<img src={LOGO_SVG} />
<img src={DEFAULT_BG} />
{isDev && <span>Dev Mode</span>}

IPC Handlers

• config:* — Config load/save
• auth:* — Microsoft OAuth, offline login
• install:* — Minecraft install, mod loader, version lists
• launch:* — Game launch, diagnose
• mods:* — Modrinth/CurseForge search, install
• instance:* — Instance CRUD
• background:* — Background image/color/blur/animation/theme
• task:* — Task system progress
• system:* — System info
• window:* — Minimize/maximize/close + splash management
• dialog:* — File picker

Key Gotchas

• @xmcl packages run in main process: @xmcl/core, @xmcl/installer require fs/child_process. All run in Electron main process.
• Path alias: @/ maps to src/.
• Window dragging: Use CSS WebkitAppRegion: "drag" as inline style (Electron only respects CSS property, not HTML attributes).
• Transparent windows: transparent: true + frame: false in BrowserWindow options.
• Mutable win ref: electron/main.ts uses a mutable win object — all handlers read win.mainWindow at runtime (not captured at registration time).
• Asset paths: Use import.meta.env.BASE_URL prefix for public assets (e.g., ${import.meta.env.BASE_URL}background.png). Absolute paths like /background.png break in packaged app.
• Config: YAML format (Koring.yml) stored next to executable. Sparse save (only non-default values).
• Auth: JSON file (koring-auth.json) stored next to executable.

Tech Stack

Layer	Technology
Frontend	React 19, Vite 7, Tailwind CSS v4, shadcn/ui, Zustand
Main Process	Node.js, TypeScript, @xmcl/* packages
Build	pnpm, Vite, electron-builder