Remove WASM endowment factory (#459)

Node landed `WebAssembly.compileStreaming` and `instantiateStreaming` in nodejs/node#42701 and made it available in Node 18, so we no longer need to exclude these properties from our WebAssembly endowment. This PR therefore removes the WebAssembly endowment factory, which will now be included in whatever form it exists on the execution environment root realm global.

Author: rekmarks

packages/execution-environments/jest.config.js

@@ -7,9 +7,9 @@ module.exports = {
   coverageThreshold: {
     global: {
       branches: 34.69,
-      functions: 38.89,
-      lines: 34.62,
-      statements: 34.98,
+      functions: 35.29,
+      lines: 32,
+      statements: 32.41,
     },
   },
   moduleFileExtensions: ['js', 'json', 'jsx', 'ts', 'tsx', 'node'],

packages/execution-environments/src/common/endowments/index.test.ts

@@ -27,13 +27,13 @@ describe('createEndowments', () => {
 
   it('handles factory endowments', () => {
     const mockWallet = { foo: Symbol('bar') };
-    const { endowments } = createEndowments(mockWallet as any, ['WebAssembly']);
+    const { endowments } = createEndowments(mockWallet as any, ['setTimeout']);
 
     expect(endowments).toStrictEqual({
       wallet: mockWallet,
-      WebAssembly: expect.objectContaining(WebAssembly),
+      setTimeout: expect.any(Function),
     });
-    expect(endowments.WebAssembly).not.toBe(WebAssembly);
+    expect(endowments.setTimeout).not.toBe(setTimeout);
   });
 
   it('handles some endowments from the same factory', () => {
@@ -80,17 +80,17 @@ describe('createEndowments', () => {
       Math,
       setTimeout: expect.any(Function),
       clearTimeout: expect.any(Function),
-      WebAssembly: { ...WebAssembly },
+      WebAssembly,
     });
 
     expect(endowments.wallet).toBe(mockWallet);
     expect(endowments.Buffer).toBe(Buffer);
-    expect(endowments.Math).toBe(Math);
     expect(endowments.console).toBe(console);
+    expect(endowments.Math).toBe(Math);
+    expect(endowments.WebAssembly).toBe(WebAssembly);
 
     expect(endowments.clearTimeout).not.toBe(clearTimeout);
     expect(endowments.setTimeout).not.toBe(setTimeout);
-    expect(endowments.WebAssembly).not.toBe(WebAssembly);
   });
 
   it('throws for unknown endowments', () => {

packages/execution-environments/src/common/endowments/index.ts

@@ -3,7 +3,6 @@ import { rootRealmGlobal } from '../globalObject';
 import buffer from './buffer';
 import timeout from './timeout';
 import interval from './interval';
-import wasm from './wasm';
 
 type EndowmentFactoryResult = {
   teardownFunction?: () => void;
@@ -15,7 +14,7 @@ type EndowmentFactoryResult = {
  * the same factory function, but we only call each factory once for each snap.
  * See {@link createEndowments} for details.
  */
-const endowmentFactories = [buffer, timeout, interval, wasm].reduce(
+const endowmentFactories = [buffer, timeout, interval].reduce(
   (factories, builder) => {
     builder.names.forEach((name) => {
       factories.set(name, builder.factory);