esm: add support for dynamic source phase hook

Author: guybedford

doc/api/esm.md

@@ -722,6 +722,17 @@ const instance2 = await WebAssembly.instantiate(libraryModule, {
 });
 ```
 
+In addition to the static source phase, there is also a dynamic variant of the
+source phase via the `import.source` dynamic phase import syntax:
+
+```js
+const dynamicLibrary = await import.source('./library.wasm');
+
+const instance = await WebAssembly.instantiate(dynamicLibrary, {
+  custom: import
+});
+```
+
 <i id="esm_experimental_top_level_await"></i>
 
 ## Top-level `await`

src/module_wrap.cc

@@ -1048,10 +1048,8 @@ void ModuleWrap::SetImportModuleDynamicallyCallback(
   realm->set_host_import_module_dynamically_callback(import_callback);
 
   isolate->SetHostImportModuleDynamicallyCallback(ImportModuleDynamically);
-  // TODO(guybedford): Enable this once
-  //                   https://github.com/nodejs/node/pull/56842 lands.
-  // isolate->SetHostImportModuleWithPhaseDynamicallyCallback(
-  //     ImportModuleDynamicallyWithPhase);
+  isolate->SetHostImportModuleWithPhaseDynamicallyCallback(
+      ImportModuleDynamicallyWithPhase);
 }
 
 void ModuleWrap::HostInitializeImportMetaObjectCallback(

test/es-module/test-esm-wasm.mjs

@@ -124,8 +124,7 @@ describe('ESM: WASM modules', { concurrency: !process.env.TEST_PARALLEL }, () =>
     strictEqual(code, 0);
   });
 
-  // TODO: Enable this once https://github.com/nodejs/node/pull/56842 lands.
-  it.skip('should support dynamic source phase imports', async () => {
+  it('should support dynamic source phase imports', async () => {
     const { code, stderr, stdout } = await spawnPromisified(execPath, [
       '--no-warnings',
       '--experimental-wasm-modules',
@@ -166,8 +165,7 @@ describe('ESM: WASM modules', { concurrency: !process.env.TEST_PARALLEL }, () =>
     strictEqual(code, 0);
   });
 
-  // TODO: Enable this once https://github.com/nodejs/node/pull/56842 lands.
-  it.skip('should not execute dynamic source phase imports', async () => {
+  it('should not execute dynamic source phase imports', async () => {
     const { code, stderr, stdout } = await spawnPromisified(execPath, [
       '--no-warnings',
       '--experimental-wasm-modules',
@@ -181,8 +179,7 @@ describe('ESM: WASM modules', { concurrency: !process.env.TEST_PARALLEL }, () =>
     strictEqual(code, 0);
   });
 
-  // TODO: Enable this once https://github.com/nodejs/node/pull/56842 lands.
-  it.skip('should throw for dynamic source phase imports not defined', async () => {
+  it('should throw for dynamic source phase imports not defined', async () => {
     const fileUrl = fixtures.fileURL('es-modules/wasm-source-phase.js');
     const { code, stderr, stdout } = await spawnPromisified(execPath, [
       '--no-warnings',
@@ -238,8 +235,7 @@ describe('ESM: WASM modules', { concurrency: !process.env.TEST_PARALLEL }, () =>
     notStrictEqual(code, 0);
   });
 
-  // TODO: Enable this once https://github.com/nodejs/node/pull/56842 lands.
-  it.skip('should throw for vm source phase dynamic import', async () => {
+  it('should throw for vm source phase dynamic import', async () => {
     const { code, stderr, stdout } = await spawnPromisified(execPath, [
       '--no-warnings',
       '--experimental-wasm-modules',