fix(@angular/build): enable oxc WASI fallback in WebContainer environments

packages/angular/build/src/tools/i18n/i18n-inliner-worker.ts

@@ -6,6 +6,7 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
+import '../oxc/oxc-wasi-shim';
 import { type DecodedSourceMap, type SourceMapInput } from '@ampproject/remapping';
 import {
   type ɵParsedTranslation,

packages/angular/build/src/tools/oxc/oxc-transform.ts

@@ -6,6 +6,7 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
+import './oxc-wasi-shim';
 import type { DecodedSourceMap } from '@ampproject/remapping';
 import { needsLinking } from '@angular/compiler-cli/linker';
 import type { BindingIdentifier, Class, Node } from '@oxc-project/types';

packages/angular/build/src/tools/oxc/oxc-wasi-shim.ts

@@ -0,0 +1,81 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.dev/license
+ */
+
+import { Module, createRequire } from 'node:module';
+
+// Workaround for an upstream incompatibility in `@oxc-parser/binding-wasm32-wasi` when
+// falling back to WebAssembly (e.g., inside WebContainers or StackBlitz).
+//
+// `@oxc-parser/binding-wasm32-wasi` declares a dependency on `@emnapi/core@2.0.0-alpha.6`,
+// but depends on `@napi-rs/wasm-runtime@~1.2.6` which expects `@emnapi/core@^1.7.1 || 2.0.0-beta.2`.
+// 1. In `@napi-rs/wasm-runtime@1.2.6`, the runtime attempts to assign `initWorker` to
+//    `emnapi_shared.addonModule`, which is undefined in `alpha.6` where the property was named
+//    `napiModule`. Aliasing `addonModule` to `this.napiModule` on `Object.prototype` allows the
+//    WASI runtime to initialize successfully.
+// 2. Under npm, `@napi-rs/wasm-runtime@1.2.6`'s peerDependencies cause npm to hoist `@emnapi/core@1.x`
+//    to top-level `node_modules` while nesting `2.0.0-alpha.6` under `@oxc-parser/binding-wasm32-wasi`,
+//    causing an ABI mismatch (`this.bridge.setLastError is not a function`). Under pnpm, `oxc-parser`
+//    does not declare `@oxc-parser/binding-wasm32-wasi` in its own dependencies. Resolving these
+//    packages relative to `@angular/build` and `@oxc-parser/binding-wasm32-wasi` ensures consistent
+//    module resolution across package managers.
+//
+// See: https://github.com/oxc-project/oxc/issues/28717 and https://github.com/napi-rs/napi-rs/issues/3674
+const forceWasi = globalThis.process?.env?.['NAPI_RS_FORCE_WASI'];
+if (
+  (globalThis.process?.versions?.['webcontainer'] ||
+    forceWasi === 'true' ||
+    forceWasi === 'error') &&
+  !('addonModule' in Object.prototype)
+) {
+  Object.defineProperty(Object.prototype, 'addonModule', {
+    get() {
+      return (this as { napiModule?: unknown }).napiModule;
+    },
+    set(value) {
+      if (this && (typeof this === 'object' || typeof this === 'function')) {
+        Object.defineProperty(this, 'addonModule', {
+          value,
+          writable: true,
+          configurable: true,
+          enumerable: true,
+        });
+      }
+    },
+    configurable: true,
+    enumerable: false,
+  });
+
+  const resolvedModules = new Map<string, string>();
+  try {
+    const wasiBindingPath = require.resolve('@oxc-parser/binding-wasm32-wasi');
+    resolvedModules.set('@oxc-parser/binding-wasm32-wasi', wasiBindingPath);
+    const wasiRequire = createRequire(wasiBindingPath);
+    resolvedModules.set('@emnapi/core', wasiRequire.resolve('@emnapi/core'));
+    resolvedModules.set('@emnapi/runtime', wasiRequire.resolve('@emnapi/runtime'));
+  } catch {}
+
+  if (resolvedModules.size > 0) {
+    const moduleWithResolve = Module as typeof Module & {
+      _resolveFilename: (
+        request: string,
+        parent: unknown,
+        isMain: boolean,
+        options: unknown,
+      ) => string;
+    };
+    const origResolveFilename = moduleWithResolve._resolveFilename;
+    moduleWithResolve._resolveFilename = function (request, parent, isMain, options) {
+      const resolved = resolvedModules.get(request);
+      if (resolved !== undefined) {
+        return resolved;
+      }
+
+      return origResolveFilename.call(this, request, parent, isMain, options);
+    };
+  }
+}

packages/angular/build/src/tools/oxc/traversal.ts

@@ -6,6 +6,7 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
+import './oxc-wasi-shim';
 import type { Node } from '@oxc-project/types';
 import { visitorKeys } from 'oxc-parser';
 

tests/e2e/tests/vite/wasi.ts

@@ -0,0 +1,23 @@
+import assert from 'node:assert';
+import { getGlobalVariable } from '../../utils/env';
+import { ng } from '../../utils/process';
+
+export default async function () {
+  assert(
+    getGlobalVariable('argv')['esbuild'],
+    'This test should not be called in the Webpack suite.',
+  );
+
+  const originalForceWasi = process.env['NAPI_RS_FORCE_WASI'];
+  process.env['NAPI_RS_FORCE_WASI'] = 'error';
+
+  try {
+    await ng('build');
+  } finally {
+    if (originalForceWasi === undefined) {
+      delete process.env['NAPI_RS_FORCE_WASI'];
+    } else {
+      process.env['NAPI_RS_FORCE_WASI'] = originalForceWasi;
+    }
+  }
+}