test(jco): add basic test for async imports

Author: vados-cosmonic

crates/js-component-bindgen/src/intrinsics/string.rs

@@ -90,7 +90,7 @@ impl StringIntrinsic {
                 let utf8EncodedLen = 0;
                 function utf8Encode(s, realloc, memory) {
                     if (typeof s !== 'string') \
-                    throw new TypeError('expected a string');
+                    throw new TypeError('expected a string, received [' + typeof s + ']');
                     if (s.length === 0) {
                         utf8EncodedLen = 0;
                         return 1;

packages/jco/test/helpers.js

@@ -284,8 +284,6 @@ export async function setupAsyncTest(args) {
     const esModuleSourcePathURL = pathToFileURL(esModuleOutputPath);
     const esModule = await import(esModuleSourcePathURL);
 
-    console.log('MODULE PATH?', esModuleOutputPath);
-
     // Optionally instantiate the ES module
     //
     // It's useful to be able to skip instantiation of the instantiation should happen

packages/jco/test/p3/async.js

@@ -62,14 +62,19 @@ suite('Async (WASI P3)', () => {
                 ),
                 imports: {
                     ...new WASIShim().getImportObject(),
-                    loadString: async () => "loaded",
-                    loadU32: async () => 43,
+                    '[async]load-string': { default: async () => "loaded" },
+                    '[async]load-u32': { default: async () => 43 },
                 },
             },
             jco: {
                 transpile: {
                     extraArgs: {
                         minify: false,
+                        asyncMode: 'jspi',
+                        asyncImports: [
+                            '[async]load-string',
+                            '[async]load-u32',
+                        ]
                     }
                 }
             }