Luau Engine 0.9.4

0.9.4 is a maintenance release focused on build times and the web target. Upgrade with luauengine self-update, or grab it from the downloads page.

Faster incremental builds#

Script-only changes no longer trigger a full asset pass. The pipeline now hashes the asset graph separately from the DataModel, so editing a .luau file and rebuilding for desktop went from ~14 s to ~1.2 s on our reference project.

luauengine build --target windows
# → 1.2s (assets cached, 1 script recompiled)

Force a full rebuild with --force if you suspect the cache is wrong. If you find a case where it is, please file it — cache correctness bugs are a priority.

WebGPU compute on the web target#

Compute shaders now work on WebGPU, which means Enum.Technology.Future renders correctly in Chrome 121+, Edge 121+ and Safari 18. The WebGL 2 fallback still downgrades to ShadowMap, and now logs a warning at startup instead of doing it silently.

Structural .rbxlx merging#

luauengine merge resolves place-file conflicts that touch different instances, instead of leaving you to pick a whole file. Register it as a Git merge driver:

git config merge.rbxlx.driver "luauengine merge --base %O --ours %A --theirs %B --out %A"

Add *.rbxlx merge=rbxlx to .gitattributes and most place conflicts stop needing a human. Full details in File formats.

Asset audit reports instance paths#

luauengine assets audit previously told you an asset could not ship. It now tells you which instances reference it:

error[E0402]: asset cannot be redistributed on target `windows`
  → assets/audio/theme.ogg
    licence: roblox-only
    referenced by:
      Workspace.Ambience.ThemeSound.SoundId
      ReplicatedStorage.Audio.Tracks.Menu

Fixes#

• glTF import preserved authored vertex normals instead of recomputing them (#412)
• Engine.Storage:WriteJSON no longer truncates on write failure, so a full disk cannot destroy a save
• CollectionService:GetTagged returned stale results after :Destroy() on the server target
• MicroProfiler traces from the server target opened as empty in Perfetto
• Windows installer failed on paths containing non-ASCII characters
• luauengine check exit code was 1 rather than 3 for capability violations
• Deterministic physics drifted between x86-64 and ARM64 after ~40 minutes
• 33 more — see the full changelog

Coming next#

0.10 takes the web and dedicated-server targets out of beta and adds the Luau-scripted editor extension host. See the roadmap.