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doc: add inline comment hints on finalizer signatures #1738

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38 changes: 35 additions & 3 deletions napi.h
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Original file line number Diff line number Diff line change
Expand Up @@ -422,12 +422,16 @@ class BasicEnv {
#endif // NAPI_VERSION > 8

#ifdef NODE_API_EXPERIMENTAL_HAS_POST_FINALIZER
// FinalizerType must implement `void operator()(Env env)`.

@alexweej alexweej Jul 14, 2026

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Have we considered using C++ Concepts for this instead of these human-only annotations?

@alexweej alexweej Jul 14, 2026

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(Though clearly this doesn't need to block the PR...)

@legendecas legendecas Jul 14, 2026 •
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it will be a semver-major to bump minimum c++ version to c++20. Right now node-addon-api still supports c++17 as in node v18/v20

node-addon-api/package.json

Line 478 in 13c28f6

"node": "^18 || ^20 || >= 21"

template <typename FinalizerType>
inline void PostFinalizer(FinalizerType finalizeCallback) const;

// FinalizerType must implement `void operator()(Env env, T* data)`.
template <typename FinalizerType, typename T>
inline void PostFinalizer(FinalizerType finalizeCallback, T* data) const;

// FinalizerType must implement `void operator()(Env env, T* data,
// Hint* hint)`.
template <typename FinalizerType, typename T, typename Hint>
inline void PostFinalizer(FinalizerType finalizeCallback,
T* data,
Expand Down Expand Up @@ -1107,9 +1111,12 @@ class Object : public TypeTaggable {
const Function& constructor ///< Constructor function
) const;

// Finalizer must implement `void operator()(Env env, T* data)`.
template <typename Finalizer, typename T>
inline void AddFinalizer(Finalizer finalizeCallback, T* data) const;

// Finalizer must implement `void operator()(Env env, T* data,
// Hint* hint)`.
template <typename Finalizer, typename T, typename Hint>
inline void AddFinalizer(Finalizer finalizeCallback,
T* data,
Expand Down Expand Up @@ -1157,7 +1164,8 @@ class External : public TypeTaggable {
// Finalizer must implement `void operator()(Env env, T* data)`.
template <typename Finalizer>
static External New(napi_env env, T* data, Finalizer finalizeCallback);
// Finalizer must implement `void operator()(Env env, T* data, Hint* hint)`.
// Finalizer must implement `void operator()(Env env, T* data,
// Hint* hint)`.
template <typename Finalizer, typename Hint>
static External New(napi_env env,
T* data,
Expand Down Expand Up @@ -1712,7 +1720,8 @@ class Buffer : public Uint8Array {
T* data,
size_t length,
Finalizer finalizeCallback);
// Finalizer must implement `void operator()(Env env, T* data, Hint* hint)`.
// Finalizer must implement `void operator()(Env env, T* data,
// Hint* hint)`.
template <typename Finalizer, typename Hint>
static Buffer<T> New(napi_env env,
T* data,
Expand All @@ -1728,7 +1737,8 @@ class Buffer : public Uint8Array {
T* data,
size_t length,
Finalizer finalizeCallback);
// Finalizer must implement `void operator()(Env env, T* data, Hint* hint)`.
// Finalizer must implement `void operator()(Env env, T* data,
// Hint* hint)`.
template <typename Finalizer, typename Hint>
static Buffer<T> NewOrCopy(napi_env env,
T* data,
Expand Down Expand Up @@ -2825,6 +2835,7 @@ class ThreadSafeFunction {
ContextType* context);

// This API may only be called from the main thread.
// Finalizer must implement `void operator()(Env env)`.
template <typename ResourceString, typename Finalizer>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
Expand All @@ -2834,6 +2845,8 @@ class ThreadSafeFunction {
Finalizer finalizeCallback);

// This API may only be called from the main thread.
// Finalizer must implement
// `void operator()(Env env, FinalizerDataType* data)`.
template <typename ResourceString,
typename Finalizer,
typename FinalizerDataType>
Expand All @@ -2846,6 +2859,8 @@ class ThreadSafeFunction {
FinalizerDataType* data);

// This API may only be called from the main thread.
// Finalizer must implement
// `void operator()(Env env, ContextType* context)`.
template <typename ResourceString, typename ContextType, typename Finalizer>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
Expand All @@ -2856,6 +2871,8 @@ class ThreadSafeFunction {
Finalizer finalizeCallback);

// This API may only be called from the main thread.
// Finalizer must implement `void operator()(Env env,
// FinalizerDataType* data, ContextType* context)`.
template <typename ResourceString,
typename ContextType,
typename Finalizer,
Expand Down Expand Up @@ -2889,6 +2906,7 @@ class ThreadSafeFunction {
ContextType* context);

// This API may only be called from the main thread.
// Finalizer must implement `void operator()(Env env)`.
template <typename ResourceString, typename Finalizer>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
Expand All @@ -2899,6 +2917,8 @@ class ThreadSafeFunction {
Finalizer finalizeCallback);

// This API may only be called from the main thread.
// Finalizer must implement
// `void operator()(Env env, FinalizerDataType* data)`.
template <typename ResourceString,
typename Finalizer,
typename FinalizerDataType>
Expand All @@ -2912,6 +2932,8 @@ class ThreadSafeFunction {
FinalizerDataType* data);

// This API may only be called from the main thread.
// Finalizer must implement
// `void operator()(Env env, ContextType* context)`.
template <typename ResourceString, typename ContextType, typename Finalizer>
static ThreadSafeFunction New(napi_env env,
const Function& callback,
Expand All @@ -2923,6 +2945,8 @@ class ThreadSafeFunction {
Finalizer finalizeCallback);

// This API may only be called from the main thread.
// Finalizer must implement `void operator()(Env env,
// FinalizerDataType* data, ContextType* context)`.
template <typename ResourceString,
typename ContextType,
typename Finalizer,
Expand Down Expand Up @@ -3067,6 +3091,8 @@ class TypedThreadSafeFunction {
// This API may only be called from the main thread.
// Creates a new threadsafe function with:
// Callback [missing] Resource [missing] Finalizer [passed]
// Finalizer must implement `void operator()(Env env,
// FinalizerDataType* data, ContextType* context)`.
template <typename ResourceString,
typename Finalizer,
typename FinalizerDataType = void>
Expand All @@ -3082,6 +3108,8 @@ class TypedThreadSafeFunction {
// This API may only be called from the main thread.
// Creates a new threadsafe function with:
// Callback [missing] Resource [passed] Finalizer [passed]
// Finalizer must implement `void operator()(Env env,
// FinalizerDataType* data, ContextType* context)`.
template <typename ResourceString,
typename Finalizer,
typename FinalizerDataType = void>
Expand Down Expand Up @@ -3124,6 +3152,8 @@ class TypedThreadSafeFunction {
// This API may only be called from the main thread.
// Creates a new threadsafe function with:
// Callback [passed] Resource [missing] Finalizer [passed]
// Finalizer must implement `void operator()(Env env,
// FinalizerDataType* data, ContextType* context)`.
template <typename ResourceString,
typename Finalizer,
typename FinalizerDataType = void>
Expand All @@ -3140,6 +3170,8 @@ class TypedThreadSafeFunction {
// This API may only be called from the main thread.
// Creates a new threadsafe function with:
// Callback [passed] Resource [passed] Finalizer [passed]
// Finalizer must implement `void operator()(Env env,
// FinalizerDataType* data, ContextType* context)`.
template <typename CallbackType,
typename ResourceString,
typename Finalizer,
Expand Down
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