src: add typedef for CleanupHookCallback callback

This commit adds a typedef for the callback parameter used in
CleanupHookCallback's constructor, AddCleanupHook, and
RemoveCleanupHook.

PR-URL: https://github.com/nodejs/node/pull/36442
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

src/env-inl.h

@@ -1024,7 +1024,7 @@ inline void Environment::SetInstanceMethod(v8::Local<v8::FunctionTemplate> that,
   t->SetClassName(name_string);
 }
 
-void Environment::AddCleanupHook(void (*fn)(void*), void* arg) {
+void Environment::AddCleanupHook(CleanupCallback fn, void* arg) {
   auto insertion_info = cleanup_hooks_.emplace(CleanupHookCallback {
     fn, arg, cleanup_hook_counter_++
   });
@@ -1032,7 +1032,7 @@ void Environment::AddCleanupHook(void (*fn)(void*), void* arg) {
   CHECK_EQ(insertion_info.second, true);
 }
 
-void Environment::RemoveCleanupHook(void (*fn)(void*), void* arg) {
+void Environment::RemoveCleanupHook(CleanupCallback fn, void* arg) {
   CleanupHookCallback search { fn, arg, 0 };
   cleanup_hooks_.erase(search);
 }

src/env.h

@@ -891,7 +891,9 @@ class ShouldNotAbortOnUncaughtScope {
 
 class CleanupHookCallback {
  public:
-  CleanupHookCallback(void (*fn)(void*),
+  typedef void (*Callback)(void*);
+
+  CleanupHookCallback(Callback fn,
                       void* arg,
                       uint64_t insertion_order_counter)
       : fn_(fn), arg_(arg), insertion_order_counter_(insertion_order_counter) {}
@@ -911,7 +913,7 @@ class CleanupHookCallback {
 
  private:
   friend class Environment;
-  void (*fn_)(void*);
+  Callback fn_;
   void* arg_;
 
   // We keep track of the insertion order for these objects, so that we can
@@ -1316,8 +1318,9 @@ class Environment : public MemoryRetainer {
   void ScheduleTimer(int64_t duration);
   void ToggleTimerRef(bool ref);
 
-  inline void AddCleanupHook(void (*fn)(void*), void* arg);
-  inline void RemoveCleanupHook(void (*fn)(void*), void* arg);
+  using CleanupCallback = CleanupHookCallback::Callback;
+  inline void AddCleanupHook(CleanupCallback cb, void* arg);
+  inline void RemoveCleanupHook(CleanupCallback cb, void* arg);
   void RunCleanup();
 
   static size_t NearHeapLimitCallback(void* data,