Electron App Builder

Electron App Builder

Core Workflow

Use this skill to create Electron apps with a polished desktop shell: frameless desktop window, custom title bar, secure preload bridge, modular IPC, Electron Builder packaging, persistent app data, asset-safe Webpack output, and Linux-friendly taskbar/icon behavior.

Before implementing, inspect the target repo. If the task is creating a new project, scaffold from the patterns in electron-shell-patterns.md. If the task is refactoring an existing Electron app, compare its current shell against that reference and patch only the missing pieces.

Implementation Rules

• Keep Electron main-process files modular: electron/main.js, electron/preload.js, electron/state.js, and focused files under electron/modules/.
• Use contextIsolation: true, nodeIntegration: false, sandbox: true, and webSecurity: true.
• Expose renderer capabilities through a small window.<appApi> bridge with allowlisted invoke, send, and on channels.
• Use frame: false with a custom title bar. On Linux, leave titleBarStyle undefined; on macOS use hidden titlebar behavior when desired.
• Keep title-bar drag regions explicit: WebkitAppRegion: 'drag' on the title area and no-drag on buttons/controls.
• Use a shared main-process state module for the current BrowserWindow and active background jobs/downloads.
• Use app.requestSingleInstanceLock() for single-instance desktop apps unless there is a specific reason not to.
• Keep app state under Electron app.getPath('userData'), preferably split into settings and library/content files. Preserve legacy state files during migrations.
• Register local media/file schemes as privileged when the renderer needs reliable local playback or fetch behavior.
• Use Electron Builder with dist/**/*, electron/**/*, public/build assets, package metadata, and any backend assets required by the app.
• Configure Webpack for content-hashed production chunks, runtimeChunk: 'single', vendor/common split chunks, inline image assets, and generous Electron-appropriate performance budgets.
• Do not copy app-specific domain logic from reference projects unless the new app needs that exact behavior.

Build Checklist

1. Create or verify package.json scripts: start, electron, dev, build, and dist.
2. Create electron/main.js with hardened BrowserWindow settings, single-instance handling, protocol registration, Linux icon setup, and module registration.
3. Create electron/preload.js with channel allowlists and listener cleanup through a WeakMap.
4. Create electron/state.js for shared mutable main-process handles.
5. Create electron/modules/system.js for window controls, safe external links, folder/file dialogs, default paths, and reveal-in-folder behavior.
6. Create electron/modules/storage.js for split JSON state under userData, temp-file writes, legacy migration, remove, and backup.
7. Add app-specific modules for downloads, media, subprocesses, diagnostics, or file processing only after the shell is stable.
8. Add a custom renderer title bar and route all window controls through the preload API.
9. Add Webpack and Babel configuration compatible with React or React Native Web.
10. Run the real build command and any available tests/checks. Do not claim runtime behavior unless Electron was actually launched and tested.

Reference

Read electron-shell-patterns.md when implementing the shell, packaging, IPC, storage, protocol, or renderer title-bar patterns. It contains the concrete reusable shell decisions.