exceptions proposal not enabled

[rioam2]

I am beginning to experiment a bit with the new exceptions proposal, and built a component using wit-bindgen@0.43.0 and the upcoming wasi-sdk changes with exception handling: WebAssembly/wasi-sdk#590.

Unfortunately, when transpiling this module to JS+TS using jco, I get the following error:

file:///.../node_modules/@bytecodealliance/jco/obj/js-component-bindgen-component.js:4769
    throw new ComponentError(retCopy.val);
          ^

ComponentError: failed to translate component

Caused by:
    exceptions proposal not enabled (at offset 0x5082)
    at generate (file:///.../node_modules/@bytecodealliance/jco/obj/js-component-bindgen-component.js:4769:11)
    at transpileComponent (file:///.../node_modules/@bytecodealliance/jco/src/cmd/transpile.js:197:39)
    at async file:///.../scripts/transpile_component.js:43:16

Node.js v20.11.1

Looking at the source code in this repo, it looks like feature proposal support is enabled within the js-component-bindgen-component crate, and more specifically with wasmparser:

jco/crates/js-component-bindgen/src/lib.rs

Lines 131 to 141 in fdc1442

	let mut validator = wasmtime_environ::wasmparser::Validator::new_with_features(
	WasmFeatures::WASM2
	| WasmFeatures::COMPONENT_MODEL
	| WasmFeatures::CM_ASYNC
	| WasmFeatures::CM_ASYNC_BUILTINS
	| WasmFeatures::CM_ASYNC_STACKFUL
	| WasmFeatures::CM_ERROR_CONTEXT
	| WasmFeatures::EXTENDED_CONST
	| WasmFeatures::MEMORY64
	| WasmFeatures::MULTI_MEMORY,
	);

Would it be reasonable to add feature support for Exceptions using wasmparser's WasmFeatures::EXCEPTIONS constant? (ref)?

[rioam2]

Thanks for the quick help resolving this one @vados-cosmonic! 🙏 Looking forward to using this in the next release

[jco-release-bot]

🎉 Code that fixes this issue is in the following release:
https://github.com/bytecodealliance/jco/releases/tag/js-component-bindgen-v1.15.0