From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Samuel Attard <marshallofsound@electronjs.org>
Date: Wed, 8 Mar 2023 13:02:17 -0800
Subject: chore: expose ImportModuleDynamically and
 HostInitializeImportMetaObjectCallback to embedders

This also subtly changes the behavior of shouldNotRegisterESMLoader to ensure that node sets up the handlers
internally but simply avoids setting its own handlers on the Isolate.  This is so that Electron can set it to
its own blended handler between Node and Blink.

Not upstreamable.

diff --git a/lib/internal/modules/esm/utils.js b/lib/internal/modules/esm/utils.js
index 41077285452eac05766a22c2e1d252868e7e548b..2246e57efcf0b95903644d643ad5572717ecdaf4 100644
--- a/lib/internal/modules/esm/utils.js
+++ b/lib/internal/modules/esm/utils.js
@@ -22,7 +22,7 @@ const {
   ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING,
   ERR_INVALID_ARG_VALUE,
 } = require('internal/errors').codes;
-const { getOptionValue } = require('internal/options');
+const { getOptionValue, getEmbedderOptions } = require('internal/options');
 const {
   loadPreloadModules,
   initializeFrozenIntrinsics,
@@ -190,12 +190,13 @@ let _isLoaderWorker = false;
  * @param {boolean} [isLoaderWorker=false] - A boolean indicating whether the loader is a worker or not.
  */
 function initializeESM(isLoaderWorker = false) {
+  const shouldSetOnIsolate = !getEmbedderOptions().shouldNotRegisterESMLoader;
   _isLoaderWorker = isLoaderWorker;
   initializeDefaultConditions();
   // Setup per-isolate callbacks that locate data or callbacks that we keep
   // track of for different ESM modules.
-  setInitializeImportMetaObjectCallback(initializeImportMetaObject);
-  setImportModuleDynamicallyCallback(importModuleDynamicallyCallback);
+  setInitializeImportMetaObjectCallback(initializeImportMetaObject, shouldSetOnIsolate);
+  setImportModuleDynamicallyCallback(importModuleDynamicallyCallback, shouldSetOnIsolate);
 }
 
 /**
diff --git a/src/module_wrap.cc b/src/module_wrap.cc
index 52c30dcb47d1faba0c2267e4381a624e450baa02..ba4c1a0d5a987e4d410b49f5c47166943bd101a6 100644
--- a/src/module_wrap.cc
+++ b/src/module_wrap.cc
@@ -547,7 +547,7 @@ MaybeLocal<Module> ModuleWrap::ResolveModuleCallback(
   return module->module_.Get(isolate);
 }
 
-static MaybeLocal<Promise> ImportModuleDynamically(
+MaybeLocal<Promise> ImportModuleDynamically(
     Local<Context> context,
     Local<v8::Data> host_defined_options,
     Local<Value> resource_name,
@@ -608,12 +608,13 @@ void ModuleWrap::SetImportModuleDynamicallyCallback(
   Environment* env = Environment::GetCurrent(args);
   HandleScope handle_scope(isolate);
 
-  CHECK_EQ(args.Length(), 1);
+  CHECK_EQ(args.Length(), 2);
   CHECK(args[0]->IsFunction());
   Local<Function> import_callback = args[0].As<Function>();
   env->set_host_import_module_dynamically_callback(import_callback);
 
-  isolate->SetHostImportModuleDynamicallyCallback(ImportModuleDynamically);
+  if (args[1]->IsBoolean() && args[1]->BooleanValue(isolate))
+    isolate->SetHostImportModuleDynamicallyCallback(ImportModuleDynamically);
 }
 
 void ModuleWrap::HostInitializeImportMetaObjectCallback(
@@ -650,13 +651,14 @@ void ModuleWrap::SetInitializeImportMetaObjectCallback(
   Environment* env = Environment::GetCurrent(args);
   Isolate* isolate = env->isolate();
 
-  CHECK_EQ(args.Length(), 1);
+  CHECK_EQ(args.Length(), 2);
   CHECK(args[0]->IsFunction());
   Local<Function> import_meta_callback = args[0].As<Function>();
   env->set_host_initialize_import_meta_object_callback(import_meta_callback);
 
-  isolate->SetHostInitializeImportMetaObjectCallback(
-      HostInitializeImportMetaObjectCallback);
+  if (args[1]->IsBoolean() && args[1]->BooleanValue(isolate))
+    isolate->SetHostInitializeImportMetaObjectCallback(
+        HostInitializeImportMetaObjectCallback);
 }
 
 MaybeLocal<Value> ModuleWrap::SyntheticModuleEvaluationStepsCallback(
diff --git a/src/module_wrap.h b/src/module_wrap.h
index 1fc801edced9c5e44613846b4dc555804c5bae97..767d183c6b6b6d97726cf5d63c0b202bd9ae10a6 100644
--- a/src/module_wrap.h
+++ b/src/module_wrap.h
@@ -30,7 +30,14 @@ enum HostDefinedOptions : int {
   kLength = 9,
 };
 
-class ModuleWrap : public BaseObject {
+NODE_EXTERN v8::MaybeLocal<v8::Promise> ImportModuleDynamically(
+    v8::Local<v8::Context> context,
+    v8::Local<v8::Data> host_defined_options,
+    v8::Local<v8::Value> resource_name,
+    v8::Local<v8::String> specifier,
+    v8::Local<v8::FixedArray> import_assertions);
+
+class NODE_EXTERN ModuleWrap : public BaseObject {
  public:
   enum InternalFields {
     kModuleSlot = BaseObject::kInternalFieldCount,
@@ -65,6 +72,8 @@ class ModuleWrap : public BaseObject {
     return true;
   }
 
+  static ModuleWrap* GetFromModule(node::Environment*, v8::Local<v8::Module>);
+
  private:
   ModuleWrap(Environment* env,
              v8::Local<v8::Object> object,
@@ -99,7 +108,6 @@ class ModuleWrap : public BaseObject {
       v8::Local<v8::String> specifier,
       v8::Local<v8::FixedArray> import_attributes,
       v8::Local<v8::Module> referrer);
-  static ModuleWrap* GetFromModule(node::Environment*, v8::Local<v8::Module>);
 
   v8::Global<v8::Module> module_;
   std::unordered_map<std::string, v8::Global<v8::Promise>> resolve_cache_;