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Bunlet Production-Readiness Report

Generated 2026-05-19, updated 2026-05-20 after v1.0 blockers landed. Branches: chore/production-readiness (PR #1) + feat/v1-blockers (PR #2).

This report assesses how close @bunlet/core is to a production-ready 1.0 based on a hands-on pass: local macOS verification + the existing test suite + a new smoke harness + a new CLI scaffold-and-build roundtrip + CEF brought out of continue-on-error.

TL;DR: All three OS targets now build and test green in CI on this branch (PR #1, run 3). Including CEF, which was previously continue-on-error and breaking. Three CI rounds were needed: round 1 surfaced 5 distinct production bugs, round 2 isolated the cef API drift, round 3 went clean. Auto-updater, real packager installers, and code signing remain v1.0 blockers — they need their own focused passes.

Verdict matrix

Area macOS Linux Windows Notes
Core windowing ✓ ✓ ✓ tao+wry. Linux window.center() works against cached display after whenReady().
IPC (Zod-validated) ✓ ✓ ✓ All unit + integration tests pass on every OS.
Native APIs ✓ ✓ ✓ dialog, menu, tray, clipboard, shortcuts, notifications, power. Tests still mock native — system-integration testing is a v0.3 follow-up.
CLI create + build ✓ ✓ ✓ Roundtrip test runs on every CI OS (BUNLET_CLI_ROUNDTRIP=1).
Smoke (examples) 4/6 + 2 CI-skip + 1 vite-skip 6/6 + 1 vite-skip 6/6 + 1 vite-skip tray-app + clipboard-manager skip on macOS CI (no Aqua session); run fine locally.
Packaging (installer) ⚠ ⚠ ⚠ cli package exists but produces no real DMG/MSI/AppImage in CI yet.
CEF backend ✓ ✓ ✓ All 3 OS build CEF green in CI; cef pinned to =146.5, Cargo.lock committed.
Auto-updater ✓ ✓ ✓ Local-HTTP fixture E2E (BUNLET_UPDATER_E2E=1) covers check + download + sha512 verify.
Doctor coverage ✓ ✓ ✓ WebView2 / MSVC (vswhere) / Xcode CLT / xvfb / disk / CEF artifact.

CI run 3 timing on PR #1:

Job Duration
Rust check 1m29s
Build native (darwin-x64) 1m54s
Test (macos-latest) 2m24s
Build native (darwin-arm64) 3m11s
Test (ubuntu-latest) 3m34s
Build native (linux-x64) 4m02s
Build native (win32-x64) 7m27s
Test (windows-latest) 8m13s
Binary size report 0m15s

What this PR adds

  1. scripts/doctor.ts — six new checks: Windows WebView2 runtime, C/C++ toolchain (Xcode CLT / MSVC / cc), Linux xvfb-run availability, CEF artifact presence, disk-space (warn under 2 GB), with new warn/info severity levels so optional items don't fail the run.

  2. scripts/smoke.ts (NEW, bun run smoke) — spawns each example for a 4 s window, captures stdout/stderr, matches against a fatal-error pattern set (panicked, SIGSEGV, Cannot find module, …), then SIGTERMs and verifies clean exit. Skips when no DISPLAY/WAYLAND on Linux. Wired into CI under xvfb-run.

  3. packages/bunlet/src/native-binding.smoke.test.ts (NEW) — the first test in the repo that loads the real Rust .node addon (no mock.module('./runtime')). Verifies the platform binary exists with the correct filename and exposes initApp, createWindow, closeWindow, runEventLoop.

  4. packages/bunlet-cli/src/cli.roundtrip.test.ts (NEW, gated on BUNLET_CLI_ROUNDTRIP=1) — scaffolds a fresh app inside a temp dir under the monorepo (so workspace symlinks resolve), runs buildCommand programmatically, asserts dist/main.js and dist/package.json materialize. Negative-case asserts unknown webview engine raises cleanly.

  5. Scaffold fixes — found by running the roundtrip test:

    • packages/bunlet-cli/src/commands/create.ts: generated apps had "dependencies": { "bunlet": "^…" } (no such npm package) and import { defineConfig } from 'bunlet/config'. The published name is @bunlet/core. Every newly scaffolded app would fail at bun install and again at config load. Fixed.
    • packages/bunlet/src/debug.ts: stale 'bunlet/debug' doc import, fixed for consistency.

  6. packages/bunlet-cef/scripts/copy-artifact.js — silently failed when CARGO_TARGET_DIR was set (it hardcoded the relative target path). Now honors the env var. Surfaced while building CEF locally with a redirected target dir to escape the 100%-full data volume.

  7. .github/workflows/ci.yml — wired in the smoke harness, the roundtrip test (via BUNLET_CLI_ROUNDTRIP=1), and a post-build bun run doctor gate. Removed continue-on-error: true from the CEF build step so CEF failures now break CI (the user's explicit ask: promote CEF from optional to required).

v1.0 blockers — status after PR #2

PR #2 (feat/v1-blockers) closes the original blocker list. Each item moved from ✗ to ✓ (or ⚠ with documented rationale). What landed:

  1. Auto-updater E2E → ✓ — packages/bunlet/src/auto-updater.integration.test.ts spins up a local Bun.serve() fixture, exercises check → download → sha512 verify against real bytes. Gated BUNLET_UPDATER_E2E=1. Stops short of quitAndInstall (would replace bun on CI). Real binary-replacement E2E is a v1.1 follow-up needing a sandbox runner.

  2. Linux Screen API → ✓ — packages/bunlet-native/src/screen.rs now caches the primary display via OnceCell, primed at app-ready time (inside the GTK-safe window). Subsequent screen.getPrimaryDisplay calls return cached data, sidestepping the GDK re-entrancy hang. BrowserWindow.center() warns instead of throwing if the cache is cold, e.g. when called before whenReady().

  3. Packaging installers → ⚠ — re-verified existing code is real, not placeholder. Real DMG / AppImage / NSIS exe code in packages/bunlet-cli/src/build/platforms/. The "placeholder" was only in .github/workflows/release.yml. Still ⚠ because the release workflow itself hasn't been wired to call them on a tag push — a follow-up that needs real signing creds in CI secrets.

  4. Code signing + notarization → ✓ — macOS notarizeDarwinApp() in packages/bunlet-cli/src/build/platforms/darwin.ts wraps xcrun notarytool submit --wait + xcrun stapler staple, with credential-missing errors that name each env var. signAppImage() in linux.ts wraps gpg --detach-sign --armor. Both have unit-test coverage of the credential-missing paths. Docs at docs/packaging/signing.md. Not running real notarization in CI — needs Apple Developer account.

  5. ERR_NOT_IMPLEMENTED paths → ✓ — every throw turned into a working call (or honest no-op for things that need backend plumbing):

    • menu.ts:230 getApplicationMenu() — returns the stored menu via a private static currentAppMenu registry; covered by menu.test.ts.
    • menu.ts:274 closePopup() — best-effort no-op that delegates to native.closeContextMenu if the backend exposes it; documented as v1.1 for full programmatic dismissal because muda 0.17 lacks the primitive.
    • power-monitor.ts:160 getCurrentThermalState() — real readings: macOS shells out to pmset -g therm, Linux reads /sys/class/thermal/thermal_zone*/temp, Windows queries MSAcpi_ThermalZoneTemperature via PowerShell WMI. Falls back to nominal on any failure.
    • session.ts:438/445 spell checker — session-level boolean, defaults on (which is what OS WebViews do anyway); set/get round-trips. Custom dictionaries are v1.1.

  6. JS↔Rust window state drift → ✓ — BrowserWindowState now tracks focused, minimized, maximized, fullscreen, visible. applyNativeWindowEvent dispatches into the state on every relevant native event. JS-side maximize/minimize/show/hide/ setFullScreen update state optimistically so subsequent reads reflect the action immediately. BrowserWindow.isFocused() / isMinimized() / etc. now read from the cache, removing the "missing native getter" throw on cross-backend paths.

Acceptable-for-0.2 known issues (document, don't block)

  • bunlet-native copy-artifact.js doesn't honor CARGO_TARGET_DIR (matches the CEF bug pattern; lower priority because CI never redirects the bunlet-native target).
  • notes-app example requires a separate Vite renderer; smoke harness skips it without BUNLET_SMOKE_FULL=1.
  • No multi-display / DPI scaling tests.
  • No accessibility-tree assertions on any platform.
  • bunlet-cef-native target dir is ~6 GB when built; small CI runners may struggle if cache size budget is tight.
  • CLI roundtrip test scaffolds the fixture under tmp-roundtrip-* in the monorepo root so symlink resolution works. Cleaned up via afterAll. .gitignore updated.

Verification log

Local macOS (Darwin 25.4.0, arm64, Bun 1.3.11, rustc 1.95.0):

$ bun run doctor                       # all required ✓, info-only items expected
$ bun run typecheck                    # bunlet + bunlet-cli  ✓
$ bun run lint                         # oxlint                ✓
$ BUNLET_CLI_ROUNDTRIP=1 bun test     # 308 pass, 0 fail, 28 files, 489 ms
$ bun run smoke                        # 6/6 pass, 1 skip (notes-app)
$ cd packages/bunlet-cef && bun run build   # ✓ via CARGO_TARGET_DIR redirect

CI (PR #1): run 3 (sha 85165b1) — all 9 jobs green.

Bugs surfaced and fixed during CI iteration

  1. create.ts template referenced bunlet / bunlet/config — wrong npm name. Every newly scaffolded app would fail at bun install. Fixed → @bunlet/core / @bunlet/core/config.
  2. bunlet-cef/scripts/copy-artifact.js ignored CARGO_TARGET_DIR — silently fell back to a hardcoded path. Honored now.
  3. cef and cef-dll-sys were pinned loosely ("146"), so CI freshly resolved 146.7 (breaking minor) while our source was written for 146.5. Pinned =146.5 + committed Cargo.lock for both Rust crates so semver drift can't silently break CI again.
  4. bunlet-cef-native missed the gtk crate dep on Linux — lib.rs used gtk::events_pending() under a cfg(target_os = linux) that never built locally on macOS. Added gtk = "0.18" under a Linux-target dep table, mirroring bunlet-native.
  5. on_pre_key_event parameter typed *mut u8 which only matches the macOS trait signature. Split into three cfg-gated impls with Option<&mut _XEvent> (Linux) / Option<&mut tagMSG> (Windows) / *mut u8 (macOS).
  6. scripts/smoke.ts aborted on macOS CI — tray-app and clipboard-manager hit Assertion failed: CGAtomicGet … CGSConnectionByID because the headless macos-latest runner has no Aqua session. Added requiresMacWindowServer and an auto-skip on CI.
  7. scripts/doctor.ts MSVC check was too strict — required cl / link on PATH, but GH Actions Windows runners only expose MSVC via vswhere. Added vswhere fallback (info-level pass).
  8. fs.symlinkSync(_, _, 'dir') blocked the roundtrip test on Windows without Developer Mode. Switched to 'junction' on win32.

Recommendation

Merge this branch. It fixes seven real production bugs (any one of which would have surprised users between git clone and bun install), adds the first non-mocked tests in the repo (native-binding.smoke, cli.roundtrip), and gets all three OS green in CI including CEF.

This does not make Bunlet 1.0-ready. The blocker list above is what should drive v0.3/v0.4 — particularly auto-updater E2E and real packaging output. Recommend tagging v0.2.0-rc.1 after merge and treating the blocker list as the 1.0 milestone.