Tauri 2.x Bundling & Distribution

Quick Guide: Configure bundling in tauri.conf.json under bundle. Platform targets: NSIS/MSI (Windows), DMG/app bundle (macOS), deb/rpm/AppImage (Linux). Code signing is required for macOS distribution (Apple notarization) and recommended for Windows (SmartScreen). The auto-updater uses Ed25519 (Minisign) signatures -- generate keys with cargo tauri signer generate, set TAURI_SIGNING_PRIVATE_KEY at build time. Cross-platform CI uses tauri-apps/tauri-action with a matrix strategy. Optimize binary size with [profile.release] settings in Cargo.toml.

Current version: Tauri 2.x (stable). Updater artifacts use createUpdaterArtifacts: true (not the v1 "v1Compatible" unless migrating).

---

<critical_requirements>

CRITICAL: Before Using This Skill

All code must follow project conventions in CLAUDE.md (kebab-case, named exports, import ordering, import type, named constants)

(You MUST set TAURI_SIGNING_PRIVATE_KEY as an environment variable at build time for updater artifacts -- never commit the private key)

(You MUST configure code signing for macOS distribution -- unsigned apps are blocked by Gatekeeper)

(You MUST use bundle.identifier as a valid reverse-domain string -- it is used for code signing, app data paths, and store submissions)

(You MUST build platform-specific installers on their native OS -- cross-compilation is limited to NSIS via cargo-xwin)

(You MUST set createUpdaterArtifacts: true in bundle to generate .sig files alongside installers)

</critical_requirements>

---

Auto-detection: tauri.conf.json bundle, cargo tauri build, bundle targets, NSIS, MSI, DMG, AppImage, deb, rpm, code signing, notarization, APPLE_SIGNING_IDENTITY, certificateThumbprint, tauri-plugin-updater, createUpdaterArtifacts, TAURI_SIGNING_PRIVATE_KEY, sidecar, externalBin, tauri-action, cargo tauri signer, Minisign, installer hooks

When to use:

• Configuring tauri.conf.json bundle settings (targets, icons, resources, identifier)
• Building platform-specific installers (NSIS, MSI, DMG, deb, rpm, AppImage)
• Setting up macOS code signing and Apple notarization
• Setting up Windows code signing (OV/EV certificates, Azure Trusted Signing)
• Configuring the auto-updater plugin with Ed25519 signature verification
• Optimizing Tauri app binary size (Rust release profile, frontend bundle)
• Bundling sidecar binaries or extra resources
• Creating GitHub Actions CI/CD for cross-platform builds
• Customizing NSIS installers with hooks or templates

When NOT to use:

• Tauri command/IPC bridge, permissions, plugins, window management (use the Tauri framework skill)
• Frontend framework or build tool configuration (separate skills)
• General Rust programming or Cargo configuration not specific to Tauri bundling
• Mobile distribution to App Store / Google Play (different workflow)

Key patterns covered:

• Bundle configuration in tauri.conf.json (examples/core.md)
• Platform-specific installer options (examples/core.md)
• macOS code signing and notarization (examples/code-signing.md)
• Windows code signing (examples/code-signing.md)
• Auto-updater setup with Ed25519 signatures (examples/updater.md)
• Binary size optimization (examples/core.md)
• Sidecar binaries and resources (examples/core.md)
• GitHub Actions cross-platform CI/CD (examples/ci-cd.md)
• NSIS installer hooks and customization (examples/core.md)

Detailed resources:

• examples/core.md - Bundle config, platform targets, size optimization, sidecars, NSIS hooks
• examples/code-signing.md - macOS notarization, Windows signing, CI/CD signing setup
• examples/updater.md - Auto-updater plugin, key generation, endpoint format, JS/Rust usage
• examples/ci-cd.md - GitHub Actions workflow, matrix strategy, secrets
• reference.md - Bundle config field reference, CLI commands, platform target table

---

Philosophy

Tauri's bundling system produces small, native installers by leveraging the OS system webview instead of bundling a browser engine. The typical binary is 5-15 MB compared to 150+ MB for alternatives. Distribution requires platform-specific steps: code signing and notarization for macOS, SmartScreen-friendly signing for Windows, and package manager formats for Linux.

The bundling workflow:

1. Configure tauri.conf.json bundle section (identifier, icons, targets)
2. Set up code signing for target platforms
3. Configure the updater plugin with Ed25519 keys
4. Build with cargo tauri build (produces installer + .sig files)
5. Distribute via CI/CD pipeline with platform matrix

Key constraints:

• Cross-compilation is limited -- build macOS on macOS, Windows on Windows (NSIS is the exception via cargo-xwin)
• Code signing requires platform-specific certificates and accounts (Apple Developer, Windows code signing cert)
• The updater requires Ed25519 signatures -- this cannot be disabled
• AppImage bundles all dependencies (~70+ MB) while deb/rpm rely on system packages (~2-6 MB)

---

Core Patterns

Pattern 1: Bundle Configuration

The bundle section in tauri.conf.json controls all packaging behavior. The identifier is the most important field -- it must be a unique reverse-domain string used for app data paths, code signing, and store submissions.

{
  "bundle": {
    "active": true,
    "targets": "all",
    "identifier": "com.mycompany.myapp",
    "icon": [
      "icons/32x32.png",
      "icons/128x128.png",
      "icons/128x128@2x.png",
      "icons/icon.icns",
      "icons/icon.ico"
    ],
    "resources": {
      "locales/*": "locales/"
    },
    "createUpdaterArtifacts": true
  }
}

Key points: "targets": "all" builds all formats for the current OS. Use cargo tauri icon path/to/1024x1024.png to generate all icon sizes. Set createUpdaterArtifacts: true to produce .sig signature files alongside installers. See examples/core.md for full config with platform-specific sections.

---

Pattern 2: Platform-Specific Installers

Each platform has distinct installer formats with different trade-offs.

Platform	Format	Output	Size	Notes
Windows	nsis	-setup.exe	~2-5 MB	Recommended, cross-compile
Windows	msi	.msi	~2-5 MB	WiX, Windows-only build
macOS	dmg	.dmg	~5-8 MB	Drag-to-install disk image
macOS	app	.app bundle	~5-8 MB	Raw app, no installer
Linux	deb	.deb	~2-6 MB	Debian/Ubuntu
Linux	rpm	.rpm	~2-6 MB	Fedora/RHEL
Linux	appimage	.AppImage	~70+ MB	Portable, bundles all deps

# Build all formats for current platform
cargo tauri build

# Build specific format
cargo tauri build --bundles nsis

# Debug build (faster compile, larger binary)
cargo tauri build --debug

Key point: You cannot build .msi on Linux or .dmg on Windows. NSIS is the only cross-compilable format (via cargo-xwin). See examples/core.md for platform-specific config sections.

---

Pattern 3: Code Signing

macOS requires both code signing and notarization for distribution outside the App Store. Windows signing prevents SmartScreen warnings.

macOS -- set environment variables for CI:

• APPLE_CERTIFICATE (base64-encoded .p12)
• APPLE_CERTIFICATE_PASSWORD
• APPLE_SIGNING_IDENTITY
• Notarization: APPLE_API_ISSUER, APPLE_API_KEY, APPLE_API_KEY_PATH (App Store Connect API)

Windows -- configure in tauri.conf.json or use signCommand:

{
  "bundle": {
    "windows": {
      "certificateThumbprint": "YOUR_THUMBPRINT",
      "digestAlgorithm": "sha256",
      "timestampUrl": "http://timestamp.comodoca.com"
    }
  }
}

Key point: macOS notarization is mandatory for apps distributed outside the App Store -- without it, Gatekeeper blocks the app. See examples/code-signing.md for full setup and CI integration.

---

Pattern 4: Auto-Updater

The updater plugin uses Ed25519 (Minisign) signatures to verify update authenticity. Signature verification cannot be disabled.

# Generate key pair (store private key securely)
cargo tauri signer generate -w ~/.tauri/myapp.key

{
  "plugins": {
    "updater": {
      "pubkey": "YOUR_ED25519_PUBLIC_KEY",
      "endpoints": [
        "https://releases.example.com/{{target}}/{{arch}}/{{current_version}}"
      ]
    }
  }
}

Key points: Set TAURI_SIGNING_PRIVATE_KEY at build time (never commit it). The endpoint template variables {{target}}, {{arch}}, {{current_version}} are resolved at runtime. The server returns HTTP 204 for no update, HTTP 200 with update JSON for available updates. See examples/updater.md for endpoint response format and JS/Rust usage.

---

Pattern 5: Binary Size Optimization

Tauri binaries are already small (5-15 MB) but can be further optimized with Rust release profile settings.

# src-tauri/Cargo.toml
[profile.release]
codegen-units = 1
lto = true
opt-level = "s"
panic = "abort"
strip = true

Setting	Impact	Trade-off
strip = true	~10-20% smaller	No debug symbols
lto = true	~10-20% smaller	Slower compile
opt-level = "s"	Optimize for size	May be slower at runtime
codegen-units = 1	Better optimization	Slower compile
panic = "abort"	Smaller binary	No panic unwinding

Key point: These settings significantly increase compile time (10-30 min clean builds). Use cargo tauri build --debug during development. Tauri 2.4+ also supports removeUnusedCommands: true in build config. See examples/core.md for frontend optimization tips.

---

Pattern 6: Sidecar Binaries

Bundle external executables that run alongside your app. Filenames must include the Rust target triple.

{
  "bundle": {
    "externalBin": ["binaries/ffmpeg"]
  }
}

binaries/ffmpeg-x86_64-pc-windows-msvc.exe
binaries/ffmpeg-x86_64-apple-darwin
binaries/ffmpeg-x86_64-unknown-linux-gnu
binaries/ffmpeg-aarch64-apple-darwin

Key point: Tauri resolves the correct platform binary at runtime. The shell plugin (tauri-plugin-shell) is required for sidecar execution. See examples/core.md for the Rust sidecar execution pattern.

---

Pattern 7: NSIS Installer Customization

Extend NSIS installers with hooks or replace the template entirely.

Four lifecycle hooks: NSIS_HOOK_PREINSTALL, NSIS_HOOK_POSTINSTALL, NSIS_HOOK_PREUNINSTALL, NSIS_HOOK_POSTUNINSTALL.

{
  "bundle": {
    "windows": {
      "nsis": {
        "installerHooks": "hooks.nsh",
        "installMode": "both",
        "displayLanguageSelector": true
      }
    }
  }
}

Key point: Use hooks for targeted changes (registry keys, file associations). Use a custom template (nsis.template) only if hooks are insufficient. See examples/core.md for hook examples.

---

<decision_framework>

Decision Framework

Which Installer Format?

Target platform?
|-- Windows
|   +-- Need MSI for enterprise deployment? -> msi (WiX, Windows-only build)
|   +-- General distribution? -> nsis (recommended, cross-compilable)
|-- macOS
|   +-- App Store? -> app bundle + App Store signing
|   +-- Direct download? -> dmg + Developer ID + notarization
|-- Linux
|   +-- Targeting Debian/Ubuntu? -> deb
|   +-- Targeting Fedora/RHEL? -> rpm
|   +-- Maximum portability? -> appimage (larger, ~70+ MB)
|   +-- Sandboxed distribution? -> snap or flatpak (manual setup)
+-- All platforms? -> Use "all" target with CI matrix

Code Signing Decision

Distributing publicly?
|-- macOS
|   +-- App Store? -> Apple Distribution certificate
|   +-- Direct download? -> Developer ID Application + notarization (REQUIRED)
|   +-- Internal/testing only? -> Ad-hoc signing (signingIdentity: "-")
|-- Windows
|   +-- Microsoft Store? -> Store signing
|   +-- Direct download? -> OV or EV certificate (prevents SmartScreen warnings)
|   +-- Internal only? -> Optional but recommended
+-- Linux
    +-- Code signing is not required for Linux distribution

Updater Strategy

Need auto-updates?
|-- YES -> tauri-plugin-updater
|   +-- Simple static hosting? -> Static JSON endpoint (GitHub Releases, S3)
|   +-- Dynamic update logic? -> Dynamic endpoint (returns 200/204)
|   +-- Need update UI? -> JS-side check() + downloadAndInstall()
|   +-- Background updates? -> Rust-side updater with AppHandle
+-- NO -> Skip updater config, omit createUpdaterArtifacts

</decision_framework>

---

<red_flags>

RED FLAGS

High Priority Issues:

• Committing TAURI_SIGNING_PRIVATE_KEY to source control -- store as CI secret, never in repo
• Missing createUpdaterArtifacts: true when using the updater -- no .sig files generated, updates fail
• Building macOS installer on Linux/Windows -- cross-compilation not supported for DMG/app bundle
• Using "targets": "all" in CI without a matrix strategy -- builds all formats for the current OS only
• Missing bundle.identifier or using an invalid format -- breaks code signing, app data paths, and store submissions
• Distributing unsigned macOS app -- Gatekeeper blocks it, users cannot open it

Medium Priority Issues:

• AppImage on Ubuntu 22.04+ targeting older distros -- higher glibc requirement breaks compatibility
• Missing strip = true in release profile -- debug symbols inflate binary by 10-20%
• Using opt-level = 3 instead of "s" or "z" when binary size matters -- optimizes for speed, not size
• WebView2 skip install mode without guarantee runtime is present -- app crashes on startup
• NSIS perUser mode when app needs system-wide installation -- installs to %LOCALAPPDATA%, not Program Files

Gotchas & Edge Cases:

• opt-level = "s" vs "z" -- sometimes "z" produces smaller binaries, sometimes "s" does. Test both.
• macOS ad-hoc signing (signingIdentity: "-") still triggers Gatekeeper warnings -- only useful for development
• NSIS is the only format supporting cross-compilation from Linux/macOS to Windows (via cargo-xwin)
• Sidecar binary filenames must include the Rust target triple suffix -- Tauri resolves the correct one at runtime
• Updater endpoint template variables ({{target}}, {{arch}}, {{current_version}}) are Tauri-specific, not environment variables
• AppImage bundles are ~70+ MB because they include all dependencies -- deb/rpm are 2-6 MB but require system packages
• Windows WebView2 runtime is bundled by default with embedBootstrapper -- older downloadBootstrapper mode requires internet at install time
• Snap/Flatpak packages run in a sandbox -- DBus communication is blocked unless declared in the manifest
• removeUnusedCommands: true (Tauri 2.4+) strips commands not in capability files -- ensure all needed commands are listed in ACL
• Free Apple Developer accounts cannot notarize apps -- a paid $99/year account is required for distribution

</red_flags>

---

<critical_reminders>

CRITICAL REMINDERS

All code must follow project conventions in CLAUDE.md (kebab-case, named exports, import ordering, import type, named constants)

(You MUST set TAURI_SIGNING_PRIVATE_KEY as an environment variable at build time for updater artifacts -- never commit the private key)

(You MUST configure code signing for macOS distribution -- unsigned apps are blocked by Gatekeeper)

(You MUST use bundle.identifier as a valid reverse-domain string -- it is used for code signing, app data paths, and store submissions)

(You MUST build platform-specific installers on their native OS -- cross-compilation is limited to NSIS via cargo-xwin)

(You MUST set createUpdaterArtifacts: true in bundle to generate .sig files alongside installers)

Failure to follow these rules will produce unsigned binaries, missing update signatures, or broken cross-platform builds.

</critical_reminders>