Build the nightly Azure pipeline with V8

[bkaradzic-microsoft]

The scheduled BabylonNative Nightly CI has failed since the 2026-10-14 run (14 validation scenes fail), and so does every manual run of it on PRs.

Cause

The pipeline builds Win32 with the default JavaScript engine, Chakra. #1934, #1936, #1938 and #1942 enabled ~40 validation scenes after Win32 validation moved to V8 (#1935), but the Chakra parser rejects the playground snippets of 14 of them:

Failed to evaluate playground snippet #M2H33B#0: SyntaxError: Syntax error
Failed to evaluate playground snippet #CSCJO2#17: SyntaxError: Unexpected identifier after numeric literal
Failed to evaluate playground snippet #22HT5Z#10: SyntaxError: Expected '('

Affected: Material Plugin, custom-handling-of-materials-for-render-target-pass, 4x computeMaxExtents, FrameGraph nrge clustered lights (simple), Render target texture with clustered lights, and 6 Clustered Lighting / Sponza Clustered Lighting scenes. PR CI never sees it because it validates on V8 only.

It is not a Babylon.js nightly regression: the same 14 pass on V8 with the current preview.babylonjs.com bundles (checked locally), and the Win32 V8 sanitizer job passes 463/464 (the one failure was an unrelated timeout, fixed in #1943).

Change

Build the nightly with -D NAPI_JAVASCRIPT_ENGINE=V8, the same engine PR CI validates on.

Chakra still builds and runs UnitTests in PR CI (Win32_x64_D3D11). The alternative is to keep Chakra here and add excludedJavaScriptEngines: ["Chakra"] (from #1941) to the 14 scenes.

I couldn't run the Azure pipeline from here. Please queue it on this branch to confirm it goes green.

[Copilot]

🟢 Approval recommended

The flag matches existing Win32 V8 CI configuration, with no identified defects; Azure execution remains unverified.

0 open findings

What changed in this PR

Aligns nightly Win32 validation with PR CI’s V8 engine to avoid Chakra parsing failures in enabled scenes.

Changes:

• Adds -D NAPI_JAVASCRIPT_ENGINE=V8 to the nightly CMake configuration.

File	Description
nightly.yml	Selects V8 for the nightly Win32 build.

🧠 Review effort: Balanced

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