feat: recognize .msix / .msixbundle assets and 'msix' package format

[dopry]

Summary

Supersedes #26 (thanks @jjeff for the original contribution — authorship is credited via Co-Authored-By on the commit). That PR was written against the pre-refactor codebase and can't be rebased mechanically: next has since replaced versions.ts / resolveForVersion.ts with the unified ReleaseService pipeline on the discrete {os, arch, pkg} model (#41–#45), and the PR's head lives on a fork branch this session can't push to. This PR reimplements the same feature idiomatically on the new architecture, preserving the external contract #26 established.

Pecans can now act as the update server for an Electron 41+ app packaged as MSIX: the /update/:platform/:version endpoint already emits the Squirrel.Mac-shaped {url, name, notes, pub_date} JSON that Electron's MSIX autoUpdater consumes — Pecans just needs to recognize .msix / .msixbundle assets and route to them when the client asks for the msix filetype.

Changes

• Detection utilities (unchanged from feat: recognize .msix / .msixbundle assets and 'msix' package format #26): SUPPORTED_FILE_EXTENSIONS gains .msix / .msixbundle; PACKAGE_FORMATS gains msix; filenameToOperatingSystem maps both extensions to windows; filenameToArchitecture treats .msixbundle as universal (multi-arch by definition) while single-arch .msix derives arch from the filename suffix (_x64, _arm64, _x86); getDownloadExtensionsByOs("windows", "msix") returns [".msixbundle", ".msix"], preferring the bundle.
• Ingestion — where this diverges from feat: recognize .msix / .msixbundle assets and 'msix' package format #26, which excluded msix from composite platform ids: on the discrete model, msix is a first-class package format, so assets ingest as windows_msix_64 / windows_msix_32 / windows_msix_universal (new PLATFORMS entries), exactly like linux_deb_64. This is what makes them reach parsePlatform/assetMatchesPlatform cleanly. arm64 .msix assets drop at ingestion like any other arm64 windows asset.
• Resolution (assetMatchesPlatform): a universal msix asset satisfies any windows arch only when msix is explicitly requested (pkg: "msix"); default windows flows (pkg: "default") never widen to msix, so a .msixbundle-only release counts toward msix availability but never toward default availability. (feat: recognize .msix / .msixbundle assets and 'msix' package format #26's ingestion-order fix made bundle availability unconditional — a bundle-only release would 200 on a default update request and then 404 on the download; the discrete model lets us return an honest 204 instead.)
• HTTP edge: new filetypeToPackageFormat maps ?filetype=msix|msixbundle to pkg: "msix" on the update and composite download routes. Other filetypes (deb, rpm, zip…) deliberately imply no pkg, preserving their existing platform-default semantics. The discrete route gets msix for free: /dl/windows/64?pkg=msix and /dl/windows/universal?pkg=msix.
• Docs: MSIX section added to docs/update-windows.md.

Downstream compatibility

• Default windows downloads/updates still resolve [".exe"] unless msix is explicitly requested — pinned by a regression test with .exe + .msix + .msixbundle published side by side.
• The Squirrel.Windows RELEASES / .nupkg path is untouched.
• The PackageFormat / SupportedFileExtension / Platform unions widen, which only affects TypeScript consumers doing exhaustive switches — semver-minor.

Test plan

• All of feat: recognize .msix / .msixbundle assets and 'msix' package format #26's unit tests ported to the current test layout (detection utilities, platform table, normalizeRelease ingestion seam, service-level resolution semantics)
• New test/integration/msix.spec.ts covers the feature end-to-end through the HTTP surface: Squirrel.Mac-shaped 200/204s for ?filetype=msix|msixbundle, feed-url → bundle download resolution, bundle-only releases satisfying arch-specific clients, default flows still serving the .exe, and the /dl + /dl/:filename routes
• 767 tests pass (up from 719 on next), tsc --noEmit clean, eslint clean

Notes

Server-side half of MSIX support for spaceagetv/missioncontrol (Visibox). References: Electron 41 release notes, electron/electron#49230.

🤖 Generated with Claude Code

https://claude.ai/code/session_019F5tixJXBm2R1FAjAfH1se

---

Generated by Claude Code

[Copilot]

Pull request overview

Adds first-class MSIX support to Pecans’ discrete {os, arch, pkg} resolution pipeline so Electron 41+ MSIX autoUpdater clients can request updates via ?filetype=msix|msixbundle and resolve to .msix / .msixbundle assets without affecting default Windows (Squirrel/.exe) behavior.

Changes:

• Extend detection + platform modeling to recognize .msix / .msixbundle, introduce pkg: "msix", and ingest MSIX assets as windows_msix_* platforms.
• Update resolution semantics so universal .msixbundle can satisfy arch-specific Windows requests only when pkg: "msix" is requested, while default Windows flows remain .exe.
• Add end-to-end integration coverage and documentation for MSIX update/download routes.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/unit/SupportedFileExtension.spec.ts	Adds MSIX/MSIXBUNDLE extension coverage and Windows msix download-extension expectations.
test/unit/service.spec.ts	Adds parsePlatform, matching, and resolution tests for msix (including universal bundle widening under pkg: "msix").
test/unit/platforms.spec.ts	Verifies filename→platform resolution for .msix/.msixbundle including arm64 drop behavior.
test/unit/PackageFormat.spec.ts	Expands PackageFormat to include msix and tests filetypeToPackageFormat.
test/unit/OperatingSystem.spec.ts	Adds OS detection expectations for .msix/.msixbundle as Windows.
test/unit/github.spec.ts	Ensures GitHub backend normalization retains msix assets alongside exe assets.
test/unit/Architecture.spec.ts	Adds .msixbundle→universal and .msix suffix arch detection tests.
test/integration/msix.spec.ts	New integration suite covering update/download/dl behavior for MSIX end-to-end.
src/utils/SupportedFileExtension.ts	Adds supported extensions and Windows pkg=msix download-extension preference ordering.
src/utils/platforms.ts	Adds windows_msix* platform IDs and allows filenameToPlatform to encode msix as a pkg segment.
src/utils/PackageFormat.ts	Adds msix package format detection + filetypeToPackageFormat mapping for HTTP filetype.
src/utils/OperatingSystem.ts	Recognizes .msix/.msixbundle as Windows.
src/utils/Architecture.ts	Treats .msixbundle as universal by definition.
src/service.ts	Allows universal msix assets to satisfy arch-specific Windows filters when pkg: "msix".
src/http/updates.ts	Applies msix pkg implication based on ?filetype=... for the Squirrel.Mac-shaped update feed.
src/http/downloads.ts	Applies msix pkg implication at the legacy /download/* HTTP edge when ?filetype=msix*.
docs/update-windows.md	Documents Electron 41+ MSIX update usage and how it interacts with default Windows behavior.

[Copilot]

Pull request overview

Copilot reviewed 17 out of 17 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 17 out of 17 changed files in this pull request and generated no new comments.