fix: wasm load error

e2e/wasm/index.test.ts

@@ -0,0 +1,9 @@
+import { expect, test } from '@rstest/core';
+
+test('WASM factorial', async () => {
+ const { _Z4facti: AsyncFactorial } = await import('./src/factorial.wasm');
+
+ expect(AsyncFactorial(1)).toBe(1);
+ expect(AsyncFactorial(2)).toBe(2);
+ expect(AsyncFactorial(3)).toBe(6);
+});

e2e/wasm/src/factorial.wasm.d.ts

@@ -0,0 +1 @@
+export function _Z4facti(n: number): number;

packages/core/src/core/plugins/external.ts

@@ -15,7 +15,7 @@ const autoExternalNodeModules: (
  return callback();
  }
 
- if (request.startsWith('@swc/helpers/')) {
+ if (request.startsWith('@swc/helpers/') || request.endsWith('.wasm')) {
  // @swc/helper is a special case (Load by require but resolve to esm)
  return callback();
  }

packages/core/src/core/plugins/mockRuntime.ts

@@ -48,6 +48,17 @@ class MockRuntimeRspackPlugin {
 
  module.source!.source = Buffer.from(finalSource);
  }
+
+ if (module.name === 'async_wasm_loading') {
+ const finalSource = module.source!.source.toString('utf-8').replace(
+ // Sets the object configurable so that imported properties can be spied
+ // Hard coded in EJS template https://github.com/web-infra-dev/rspack/tree/7df875eb3ca3bb4bcb21836fdf4e6be1f38a057c/crates/rspack_plugin_wasm/src/runtime
+ 'readFile(',
+ 'readWasmFile(',
+ );
+
+ module.source!.source = Buffer.from(finalSource);
+ }
  },
  );
  });

packages/core/src/runtime/worker/loadModule.ts

@@ -171,6 +171,22 @@ export const loadModule = ({
  assetFiles,
  interopDefault,
  ),
+ readWasmFile: (
+ wasmPath: string,
+ callback: (err: Error | null, data?: Buffer) => void,
+ ) => {
+ const joinedPath = isRelativePath(wasmPath)
+ ? path.join(path.dirname(distPath), wasmPath)
+ : wasmPath;
+ const content = assetFiles[path.normalize(joinedPath)];
+ if (content) {
+ callback(null, Buffer.from(content, 'utf-8'));
+ } else {
+ callback(
+ new Error(`WASM file ${joinedPath} not found in asset files.`),
+ );
+ }
+ },
  __rstest_dynamic_import__: defineRstestDynamicImport({
  testPath,
  interopDefault,

packages/core/src/utils/error.ts

@@ -67,8 +67,11 @@ export async function printError(
  fullStack: error.fullStack,
  getSourcemap,
  });
-
- if (!stackFrames.length && error.stack.length) {
+ if (
+ !stackFrames.length &&
+ Array.isArray(error.stack) &&
+ error.stack.length
+ ) {
  logger.log(
  color.gray(
  "No error stack found, set 'DEBUG=rstest' to show fullStack.",