Desktop App Builder — Skill Reference

CRITICAL: Sandbox Awareness

You are running in a cloud sandbox. You CANNOT:

• Access npm registry (you will get 502 errors)
• Download Electron or any packages
• Run npm install, npm ci, yarn install, curl, or wget

DO NOT attempt to install or download anything. It WILL fail.

How It Works

The user has a pre-built Electron template on their LOCAL Mac at:

~/.wix-desktop-app-template/

It contains node_modules with the full Electron binary. Your job is to:

1. Generate a .command script (self-contained bash file)
2. The script runs on the USER'S Mac (not in the sandbox)
3. It copies the template, writes index.html + updates main.js, and builds the .dmg

Template File Structure

~/.wix-desktop-app-template/
├── main.js          — Loads index.html via path.join(__dirname, 'index.html'), has SITE_ID_PLACEHOLDER
├── preload.js       — IPC bridge: window.wixApi()
├── index.html       — Placeholder, replaced with generated UI
├── package.json     — files: ["main.js", "preload.js", "index.html"], productName: "WixManager"
└── node_modules/    — Full Electron + electron-builder (pre-installed)

What the .command Script Must Do

1. Copy template: cp -a ~/.wix-desktop-app-template "$BUILD_DIR" (use -a NOT -r — preserves symlinks!)
2. Verify node_modules exists
3. Replace SITE_ID_PLACEHOLDER in main.js with real site ID via sed
4. Write the full generated HTML as $BUILD_DIR/index.html (heredoc)
5. Update productName in package.json via sed
6. Build: cd "$BUILD_DIR" && npx electron-builder --mac dmg
7. Open output folder in Finder

Critical Rules

• NEVER embed HTML in main.js — write it as index.html
• NEVER use loadURL('data:text/html...') — use loadFile(path.join(__dirname, 'index.html'))
• ALWAYS use cp -a not cp -r (preserves symlinks in node_modules/.bin)
• NEVER modify main.js beyond the sed replacement of SITE_ID_PLACEHOLDER
• NEVER run npm install or any download command

BANNED COMMANDS (in the sandbox)

• npm install / npm ci / yarn install / pnpm install
• npm init
• curl or wget to download packages
• Any command that installs or downloads dependencies
• Building a web app / HTML file as a fallback

Output Naming

Name the .command file after its function:

• WixPriceEditor-builder.command
• WixOrderManager-builder.command
• WixInventoryManager-builder.command
• WixFulfillmentManager-builder.command
• WixProductEditor-builder.command

Size Constraint

Keep the final binary under 120MB. Do not bundle unnecessary Electron modules.