wip: fix async function specification

Author: vados-cosmonic

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

@@ -298,7 +298,8 @@ pub(crate) fn requires_async_porcelain(
     let name = match func {
         FunctionIdentifier::Fn(func) => func.name.as_str(),
         FunctionIdentifier::CanonFnName(name) => name,
-    };
+    }
+    .trim_start_matches("[async]");
 
     if async_funcs.contains(name) {
         return true;

crates/js-component-bindgen/src/transpile_bindgen.rs

@@ -3697,7 +3697,7 @@ impl<'a> Instantiator<'a, '_> {
                     // NOTE: this breaks because using WebAssembly.promising and trying to
                     // await JS from the host is a bug ("trying to suspend JS frames")
                     //
-                    // We trigger this either with --async-imports *OR* by widening the check as below
+                    // We trigger this either with --async-exports *OR* by widening the check as below
                     //
                     // .push((core_export_fn.clone(), requires_async_porcelain || is_async));
                     .push((core_export_fn.clone(), requires_async_porcelain));

packages/jco/test/p3/ported/wasmtime/component-async/common.js

@@ -46,8 +46,8 @@ export async function buildAndTranspile(args) {
         jco: {
             transpile: {
                 extraArgs: {
+                    asyncExports: ['local:local/run#run'] ,
                     ...(args.transpile?.extraArgs || {}),
-                    asyncExports: ['local:local/run#run'],
                 },
             },
         },

packages/jco/test/p3/ported/wasmtime/component-async/post-return.js

@@ -88,10 +88,14 @@ suite('post-return async sleep scenario', () => {
                     extraArgs: {
                         minify: false,
                         asyncImports: [
-                            // NOTE: without this async import specified, attempting to
-                            // sleep across JS frames will fail.
+                            // Provided by the host
                             'local:local/sleep#sleep-millis',
                         ],
+                        asyncExports: [
+                            // NOTE: Provided by the component, but *does* trigger calling
+                            // of the host-provided async improt
+                            'local:local/sleep-post-return#run',
+                        ],
                     }
                 },
             });