jgraph/drawio-desktop

Main process / window management

src/main/electron.js bootstraps the Electron app, creates BrowserWindows, handles menus, dialogs, clipboard, spellcheck, hardware acceleration toggles, and multi-window lifecycle.

IPC bridge (preload)

src/main/electron-preload.js exposes a narrow request/response and message-listener API over ipcRenderer via contextBridge, plus seeds localStorage configuration during first-run migration.

CLI argument parsing & export options

src/main/args.js defines all command-line flags (--export, --format, --page-range, HTML/SVG viewer options, etc.) with validation regexes and help text generation.

Auto-update subsystem

Uses electron-updater's autoUpdater with manual download triggering, silent vs. interactive modes controlled by DRAWIO_DISABLE_UPDATE/--disable-update/--no-silent-update env vars/flags, and flatpak detection; failures route to deduplicated error dialogs.

Blessed-paths authorization model

Maintains a persisted Set of user-authorized filesystem paths (via electron-store key 'blessedPaths', capped at 500) resolved through realpath so the renderer cannot write outside trusted locations even via validated IPC handlers.

PDF export engine

Leverages @cantoo/pdf-lib (PDFDocument, PDFHexString, PDFName) to generate PDF exports of diagrams.

Progress bar UI

src/main/progress-bar.js implements a self-contained BrowserWindow-based progress dialog with indeterminate/determinate modes using data: URLs and executeJavaScript updates.

Window bounds persistence

src/main/window-bounds.js provides pure functions to parse and validate saved window geometry against current display work areas, recentering when monitors change.