Lower minimum supported Node.js version for Wasm Exnref EH

[kleisauke]

The --experimental-wasm-exnref flag has been available since Node.js 22, see commit:
nodejs/node@09a8440

[kleisauke]

FWIW, Node.js 25 ships this unflagged (see e.g. commit nodejs/node@fff0d15). However, it's not an LTS release.

[sbc100]

Can you try rebasing, a codesize update just landed.

[sbc100]

One issue the consider is that because --experimental-wasm-exnref is an experimental flag, the implementation might not be correct, or it might not be correct in one version node.

I wonder if we should only consider unflagged features here in the this file?

[kleisauke]

Good question. I'm not sure what the best way to handle this is. I think there's a similar issue with Feature.JS_BIGINT_INTEGRATION, which doesn't match the versions shown on https://webassembly.org/features/ (i.e. it needs --experimental-wasm-bigint for Node.js versions before v16).

[kleisauke]

Is it OK to land this? For full context: it allows me to compile and link with -fwasm-exceptions -sWASM_LEGACY_EXCEPTIONS=0 in the pre-built emsdk Dockerfile. Without it, all runtime checks fail with the following error:

/src/build/deps/glib/_build/meson-private/tmp91ds8ed9/output.js:19
    throw new Error(`This emscripten-generated code requires node v${ packedVersionToHumanReadable(240000) } (detected v${packedVersionToHumanReadable(currentNodeVersion)})`);
    ^

Error: This emscripten-generated code requires node v24.0.0 (detected v22.16.0)
    at /src/build/deps/glib/_build/meson-private/tmp91ds8ed9/output.js:19:11
    at Object.<anonymous> (/src/build/deps/glib/_build/meson-private/tmp91ds8ed9/output.js:36:3)
    at Module._compile (node:internal/modules/cjs/loader:1730:14)
    at Object..js (node:internal/modules/cjs/loader:1895:10)
    at Module.load (node:internal/modules/cjs/loader:1465:32)
    at Function._load (node:internal/modules/cjs/loader:1282:12)
    at TracingChannel.traceSync (node:diagnostics_channel:322:14)
    at wrapModuleLoad (node:internal/modules/cjs/loader:235:24)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:171:5)
    at node:internal/main/run_main_module:36:49

Node.js v22.16.0