This package owns the native shell: windows, menus, deep links, native notifications, auto-updates, host switching, SSH connections, tunnel helpers, and packaged desktop builds. The web UI and OpenChamber server logic still live in packages/web and shared React UI lives in packages/ui.

How It Runs

Desktop starts the OpenChamber web server in the same Electron main process. There is no separate sidecar subprocess for the OpenChamber server.

main.mjs imports @openchamber/web/server/index.js and calls startWebUiServer(). The Electron window then loads the UI from the local server in development, or from packaged resources/web-dist assets in packaged builds.

The preload bridge exposes desktop-only APIs to the web UI through window.__OPENCHAMBER_DESKTOP__. Privileged commands are checked in main.mjs, not only in the UI.

Main Files

File	Purpose
`main.mjs`	Electron main process, app lifecycle, windows, menus, deep links, native IPC handlers, updates, local server startup
`preload.mjs`	Safe bridge from the rendered UI to Electron IPC
`ssh-manager.mjs`	SSH host import, connection lifecycle, tunnel/port forwarding helpers
`scripts/electron-dev.mjs`	Desktop dev launcher with Vite HMR support
`scripts/build-web-assets.mjs`	Builds `packages/web` and stages UI assets into `resources/web-dist`
`scripts/bundle-main.mjs`	Bundles Electron main code into `dist-bundle/main.mjs` for packaging
`scripts/rebuild-native.mjs`	Rebuilds native modules against the Electron runtime
`scripts/package.mjs`	Runs `electron-builder`, with unsigned Windows builds when signing env is missing
`resources/`	Packaged web assets, icons, and macOS entitlements

Development

From the repo root:

bun install
bun run electron:dev

bun run electron:dev starts the web dev server with HMR, then launches Electron against packages/electron/main.mjs.

Useful variants:

bun run electron:dev:bundled
bun run type-check:electron
bun run lint:electron

electron:dev:bundled builds and uses packaged web assets instead of the HMR server. Use it when testing behavior closer to a packaged app.

Packaging

From the repo root:

bun run electron:build

That runs, in order:

build:web-assets to build the web UI and copy it into packages/electron/resources/web-dist.
bundle:main to create packages/electron/dist-bundle/main.mjs.
rebuild:native to rebuild native modules for Electron.
package.mjs to run electron-builder.

Build output goes to packages/electron/dist.

macOS builds produce dmg and zip artifacts. Windows builds produce an NSIS installer.

Platform Notes

macOS packaging needs Xcode/build tools for notarized builds and icon asset compilation.

Windows packaging needs NSIS support through electron-builder. If no Windows signing env is set, package.mjs disables code signing and builds an unsigned installer.

The package supports macOS and Windows desktop features. Some native discovery helpers are platform-specific. For example, app icon fetching and app filtering currently only work on macOS, while opening files in installed apps works on macOS and Windows.

Common Env Vars

Variable	Use
`OPENCHAMBER_ELECTRON_DEV=1`	Marks the runtime as desktop development mode
`OPENCHAMBER_ELECTRON_USE_BUNDLED_UI=1`	Uses staged web assets instead of the HMR dev server
`OPENCHAMBER_HMR_UI_PORT`	Preferred Vite UI port for desktop dev, default `5173`
`OPENCHAMBER_HMR_API_PORT`	Preferred API port for desktop dev, default `3901`
`OPENCHAMBER_RUNTIME=desktop`	Set by Electron before starting the web server
`OPENCHAMBER_DESKTOP_NOTIFY=true`	Enables desktop notification flow in the web server
`OPENCHAMBER_SKIP_API_COMPRESSION=true`	Defaulted by Desktop to reduce local CPU overhead
`OPENCODE_HOST` / `OPENCODE_PORT` / `OPENCODE_SKIP_START`	Connect Desktop to an external OpenCode server instead of starting one locally

Native Features Owned Here

Floating Mini Chat windows.
Multiple native windows.
Native notifications.
One-click open/reveal/open-in-app actions.
Desktop host switcher and deep-link imports.
Local and remote instance handling.
SSH host import, connections, logs, and port forwarding.
Tunnel lifecycle integration through the web server runtime.
Auto-update checks, downloads, and restart/apply flow.

IPC Pattern

Renderer code should call the desktop bridge exposed by preload.mjs. Do not import Electron from shared UI code.

Add new native capabilities in this order:

Add or update the preload.mjs bridge only if a new renderer-facing shape is needed.
Add the real command handling in main.mjs under openchamber:invoke.
Gate privileged commands in main process logic so remote pages cannot access local filesystem or shell capabilities.
Keep shared UI runtime contracts in packages/ui and server/runtime APIs in packages/web when the behavior is not inherently native.

Logs And Data

Electron uses electron-log. In development, console logs are also visible in the terminal. In packaged apps, logs are written through the platform log path for the OpenChamber app name.

Development builds use a separate user data directory named OpenChamber Dev, so dev state does not overwrite normal packaged app state.

Things To Be Careful With

Keep desktop-specific code in this package. Do not move OpenCode feature backend logic into Electron.
Use hidden Windows process launches for background helpers. Avoid visible console flashes.
Keep @openchamber/web, bun-pty, node-pty, and native modules external in bundle-main.mjs; bundling them can break Electron startup.
Rebuild native modules after dependency or Electron version changes.
Test both HMR dev mode and bundled UI mode when changing startup, preload, routing, or packaged asset behavior.

Quick Checks

bun run type-check:electron
bun run lint:electron
bun run electron:dev:bundled

For full repo validation before shipping:

bun run type-check
bun run lint