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NightMonkey is an ahead-of-time JS-to-Wasm compiler built on top of SpiderMonkey. This PR adds a `--nightmonkey` CLI flag that selects the NightMonkey variant of the engine, and invokes the NightMonkey compiler (which is a native binary) on a snapshotted image to AOT-compile JS bytecode into Wasm bytecode. Because the NightMonkey compiler itself is a native program, this PR incorporates binaries for four platforms (Linux/x86-64, Linux/aarch64, Windows/x86-64, macOS/aarch64) and bundles them all into the monolithic NPM package, adding ~25MiB. If we instead want to split out per-platform sub-packages and dynamically download them as needed, I am happy to do that instead.
cfallin
requested review from
andreiltd,
tschneidereit and
vados-cosmonic
as code owners
September 23, 2026 21:58
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NightMonkey is an ahead-of-time JS-to-Wasm compiler built on top of SpiderMonkey.
This PR adds a
--nightmonkeyCLI flag that selects the NightMonkey variant of the engine, and invokes the NightMonkey compiler (which is a native binary) on a snapshotted image to AOT-compile JS bytecode into Wasm bytecode.Because the NightMonkey compiler itself is a native program, this PR incorporates binaries for four platforms (Linux/x86-64, Linux/aarch64, Windows/x86-64, macOS/aarch64) and bundles them all into the monolithic NPM package, adding ~25MiB. If we instead want to split out per-platform sub-packages and dynamically download them as needed, I am happy to do that instead.
Depends on bytecodealliance/StarlingMonkey#323 and bytecodealliance/nightmonkey#1.