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 // Copyright Joyent, Inc. and other Node contributors.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a
 // copy of this software and associated documentation files (the
 // "Software"), to deal in the Software without restriction, including
 // without limitation the rights to use, copy, modify, merge, publish,
 // distribute, sublicense, and/or sell copies of the Software, and to permit
 // persons to whom the Software is furnished to do so, subject to the
 // following conditions:
 //
 // The above copyright notice and this permission notice shall be included
 // in all copies or substantial portions of the Software.
 //
 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
 // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #ifndef SRC_NODE_H_
 #define SRC_NODE_H_
 
 #ifdef _WIN32
 # ifndef BUILDING_NODE_EXTENSION
 #  define NODE_EXTERN __declspec(dllexport)
 # else
 #  define NODE_EXTERN __declspec(dllimport)
 # endif
 #else
 # define NODE_EXTERN __attribute__((visibility("default")))
 #endif
 
 // Declarations annotated with NODE_EXTERN_PRIVATE do not form part of
 // the public API. They are implementation details that can and will
 // change between releases, even in semver patch releases. Do not use
 // any such symbol in external code.
 #ifdef NODE_SHARED_MODE
 #define NODE_EXTERN_PRIVATE NODE_EXTERN
 #else
 #define NODE_EXTERN_PRIVATE
 #endif
 
 #ifdef BUILDING_NODE_EXTENSION
 # undef BUILDING_V8_SHARED
 # undef BUILDING_UV_SHARED
 # define USING_V8_SHARED 1
 # define USING_UV_SHARED 1
 #endif
 
 // This should be defined in make system.
 // See issue https://github.com/nodejs/node-v0.x-archive/issues/1236
 #if defined(__MINGW32__) || defined(_MSC_VER)
 #ifndef _WIN32_WINNT
 # define _WIN32_WINNT 0x0600  // Windows Server 2008
 #endif
 
 #ifndef NOMINMAX
 # define NOMINMAX
 #endif
 
 #endif
 
 #if defined(_MSC_VER)
 #define PATH_MAX MAX_PATH
 #endif
 
 #ifdef _WIN32
 #define SIGQUIT 3
 #define SIGKILL 9
 #endif
 
 #include "v8.h"  // NOLINT(build/include_order)
 
 #include "v8-platform.h"  // NOLINT(build/include_order)
 #include "node_version.h"  // NODE_MODULE_VERSION
 
 #define NAPI_EXPERIMENTAL
 #include "node_api.h"
 
 #include <functional>
 #include <memory>
 #include <optional>
 #include <ostream>
 
 // We cannot use __POSIX__ in this header because that's only defined when
 // building Node.js.
 #ifndef _WIN32
 #include <signal.h>
 #endif  // _WIN32
 
 #define NODE_MAKE_VERSION(major, minor, patch)                                \
   ((major) * 0x1000 + (minor) * 0x100 + (patch))
 
 #ifdef __clang__
 # define NODE_CLANG_AT_LEAST(major, minor, patch)                             \
   (NODE_MAKE_VERSION(major, minor, patch) <=                                  \
       NODE_MAKE_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__))
 #else
 # define NODE_CLANG_AT_LEAST(major, minor, patch) (0)
 #endif
 
 #ifdef __GNUC__
 # define NODE_GNUC_AT_LEAST(major, minor, patch)                              \
   (NODE_MAKE_VERSION(major, minor, patch) <=                                  \
       NODE_MAKE_VERSION(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__))
 #else
 # define NODE_GNUC_AT_LEAST(major, minor, patch) (0)
 #endif
 
 #if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
 # define NODE_DEPRECATED(message, declarator) declarator
 #else  // NODE_WANT_INTERNALS
 # if NODE_CLANG_AT_LEAST(2, 9, 0) || NODE_GNUC_AT_LEAST(4, 5, 0)
 #  define NODE_DEPRECATED(message, declarator)                                 \
     __attribute__((deprecated(message))) declarator
 # elif defined(_MSC_VER)
 #  define NODE_DEPRECATED(message, declarator)                                 \
     __declspec(deprecated) declarator
 # else
 #  define NODE_DEPRECATED(message, declarator) declarator
 # endif
 #endif
 
 // Forward-declare libuv loop
 struct uv_loop_s;
 
 // Forward-declare these functions now to stop MSVS from becoming
 // terminally confused when it's done in node_internals.h
 namespace node {
 
 struct SnapshotData;
 
 namespace tracing {
 
 class TracingController;
 
 }
 
 NODE_EXTERN v8::Local<v8::Value> ErrnoException(v8::Isolate* isolate,
                                                 int errorno,
                                                 const char* syscall = nullptr,
                                                 const char* message = nullptr,
                                                 const char* path = nullptr);
 NODE_EXTERN v8::Local<v8::Value> UVException(v8::Isolate* isolate,
                                              int errorno,
                                              const char* syscall = nullptr,
                                              const char* message = nullptr,
                                              const char* path = nullptr,
                                              const char* dest = nullptr);
 
 NODE_DEPRECATED("Use ErrnoException(isolate, ...)",
                 inline v8::Local<v8::Value> ErrnoException(
       int errorno,
       const char* syscall = nullptr,
       const char* message = nullptr,
       const char* path = nullptr) {
   return ErrnoException(v8::Isolate::GetCurrent(),
                         errorno,
                         syscall,
                         message,
                         path);
 })
 
 NODE_DEPRECATED("Use UVException(isolate, ...)",
                 inline v8::Local<v8::Value> UVException(int errorno,
                                         const char* syscall = nullptr,
                                         const char* message = nullptr,
                                         const char* path = nullptr) {
   return UVException(v8::Isolate::GetCurrent(),
                      errorno,
                      syscall,
                      message,
                      path);
 })
 
 /*
  * These methods need to be called in a HandleScope.
  *
  * It is preferred that you use the `MakeCallback` overloads taking
  * `async_context` arguments.
  */
 
 NODE_DEPRECATED("Use MakeCallback(..., async_context)",
                 NODE_EXTERN v8::Local<v8::Value> MakeCallback(
                     v8::Isolate* isolate,
                     v8::Local<v8::Object> recv,
                     const char* method,
                     int argc,
                     v8::Local<v8::Value>* argv));
 NODE_DEPRECATED("Use MakeCallback(..., async_context)",
                 NODE_EXTERN v8::Local<v8::Value> MakeCallback(
                     v8::Isolate* isolate,
                     v8::Local<v8::Object> recv,
                     v8::Local<v8::String> symbol,
                     int argc,
                     v8::Local<v8::Value>* argv));
 NODE_DEPRECATED("Use MakeCallback(..., async_context)",
                 NODE_EXTERN v8::Local<v8::Value> MakeCallback(
                     v8::Isolate* isolate,
                     v8::Local<v8::Object> recv,
                     v8::Local<v8::Function> callback,
                     int argc,
                     v8::Local<v8::Value>* argv));
 
 }  // namespace node
 
 #include <cassert>
 #include <cstdint>
 
 #ifndef NODE_STRINGIFY
 # define NODE_STRINGIFY(n) NODE_STRINGIFY_HELPER(n)
 # define NODE_STRINGIFY_HELPER(n) #n
 #endif
 
 #ifdef _WIN32
 #if !defined(_SSIZE_T_) && !defined(_SSIZE_T_DEFINED)
 typedef intptr_t ssize_t;
 # define _SSIZE_T_
 # define _SSIZE_T_DEFINED
 #endif
 #else  // !_WIN32
 # include <sys/types.h>  // size_t, ssize_t
 #endif  // _WIN32
 
 
 namespace node {
 
 class IsolateData;
 class Environment;
 class MultiIsolatePlatform;
 class InitializationResultImpl;
 
 namespace ProcessInitializationFlags {
 enum Flags : uint32_t {
   kNoFlags = 0,
   // Enable stdio inheritance, which is disabled by default.
   // This flag is also implied by kNoStdioInitialization.
   kEnableStdioInheritance = 1 << 0,
   // Disable reading the NODE_OPTIONS environment variable.
   kDisableNodeOptionsEnv = 1 << 1,
   // Do not parse CLI options.
   kDisableCLIOptions = 1 << 2,
   // Do not initialize ICU.
   kNoICU = 1 << 3,
   // Do not modify stdio file descriptor or TTY state.
   kNoStdioInitialization = 1 << 4,
   // Do not register Node.js-specific signal handlers
   // and reset other signal handlers to default state.
   kNoDefaultSignalHandling = 1 << 5,
   // Do not perform V8 initialization.
   kNoInitializeV8 = 1 << 6,
   // Do not initialize a default Node.js-provided V8 platform instance.
   kNoInitializeNodeV8Platform = 1 << 7,
   // Do not initialize OpenSSL config.
   kNoInitOpenSSL = 1 << 8,
   // Do not initialize Node.js debugging based on environment variables.
   kNoParseGlobalDebugVariables = 1 << 9,
   // Do not adjust OS resource limits for this process.
   kNoAdjustResourceLimits = 1 << 10,
   // Do not map code segments into large pages for this process.
   kNoUseLargePages = 1 << 11,
   // Skip printing output for --help, --version, --v8-options.
   kNoPrintHelpOrVersionOutput = 1 << 12,
   // Do not perform cppgc initialization. If set, the embedder must call
   // cppgc::InitializeProcess() before creating a Node.js environment
   // and call cppgc::ShutdownProcess() before process shutdown.
   kNoInitializeCppgc = 1 << 13,
   // Initialize the process for predictable snapshot generation.
   kGeneratePredictableSnapshot = 1 << 14,
 
   // Emulate the behavior of InitializeNodeWithArgs() when passing
   // a flags argument to the InitializeOncePerProcess() replacement
   // function.
   kLegacyInitializeNodeWithArgsBehavior =
       kNoStdioInitialization | kNoDefaultSignalHandling | kNoInitializeV8 |
       kNoInitializeNodeV8Platform | kNoInitOpenSSL |
       kNoParseGlobalDebugVariables | kNoAdjustResourceLimits |
       kNoUseLargePages | kNoPrintHelpOrVersionOutput | kNoInitializeCppgc,
 };
 }  // namespace ProcessInitializationFlags
 namespace ProcessFlags = ProcessInitializationFlags;  // Legacy alias.
 
 namespace StopFlags {
 enum Flags : uint32_t {
   kNoFlags = 0,
   // Do not explicitly terminate the Isolate
   // when exiting the Environment.
   kDoNotTerminateIsolate = 1 << 0,
 };
 }  // namespace StopFlags
 
 class NODE_EXTERN InitializationResult {
  public:
   virtual ~InitializationResult() = default;
 
   // Returns a suggested process exit code.
   virtual int exit_code() const = 0;
 
   // Returns 'true' if initialization was aborted early due to errors.
   virtual bool early_return() const = 0;
 
   // Returns the parsed list of non-Node.js arguments.
   virtual const std::vector<std::string>& args() const = 0;
 
   // Returns the parsed list of Node.js arguments.
   virtual const std::vector<std::string>& exec_args() const = 0;
 
   // Returns an array of errors. Note that these may be warnings
   // whose existence does not imply a non-zero exit code.
   virtual const std::vector<std::string>& errors() const = 0;
 
   // If kNoInitializeNodeV8Platform was not specified, the global Node.js
   // platform instance.
   virtual MultiIsolatePlatform* platform() const = 0;
 
  private:
   InitializationResult() = default;
   friend class InitializationResultImpl;
 };
 
 // TODO(addaleax): Officially deprecate this and replace it with something
 // better suited for a public embedder API.
 NODE_EXTERN int Start(int argc, char* argv[]);
 
 // Tear down Node.js while it is running (there are active handles
 // in the loop and / or actively executing JavaScript code).
 NODE_EXTERN int Stop(Environment* env,
                      StopFlags::Flags flags = StopFlags::kNoFlags);
 
 // Set up per-process state needed to run Node.js. This will consume arguments
 // from argv, fill exec_argv, and possibly add errors resulting from parsing
 // the arguments to `errors`. The return value is a suggested exit code for the
 // program; If it is 0, then initializing Node.js succeeded.
 // This runs a subset of the initialization performed by
 // InitializeOncePerProcess(), which supersedes this function.
 // The subset is roughly equivalent to the one given by
 // `ProcessInitializationFlags::kLegacyInitializeNodeWithArgsBehavior`.
 NODE_DEPRECATED("Use InitializeOncePerProcess() instead",
                 NODE_EXTERN int InitializeNodeWithArgs(
                     std::vector<std::string>* argv,
                     std::vector<std::string>* exec_argv,
                     std::vector<std::string>* errors,
                     ProcessInitializationFlags::Flags flags =
                         ProcessInitializationFlags::kNoFlags));
 
 // Set up per-process state needed to run Node.js. This will consume arguments
 // from args, and return information about the initialization success,
 // including the arguments split into argv/exec_argv, a list of potential
 // errors encountered during initialization, and a potential suggested
 // exit code.
 NODE_EXTERN std::shared_ptr<InitializationResult> InitializeOncePerProcess(
     const std::vector<std::string>& args,
     ProcessInitializationFlags::Flags flags =
         ProcessInitializationFlags::kNoFlags);
 // Undoes the initialization performed by InitializeOncePerProcess(),
 // where cleanup is necessary.
 NODE_EXTERN void TearDownOncePerProcess();
 // Convenience overload for specifying multiple flags without having
 // to worry about casts.
 inline std::shared_ptr<InitializationResult> InitializeOncePerProcess(
     const std::vector<std::string>& args,
     std::initializer_list<ProcessInitializationFlags::Flags> list) {
   uint64_t flags_accum = ProcessInitializationFlags::kNoFlags;
   for (const auto flag : list) flags_accum |= static_cast<uint64_t>(flag);
   return InitializeOncePerProcess(
       args, static_cast<ProcessInitializationFlags::Flags>(flags_accum));
 }
 
 enum OptionEnvvarSettings {
   // Allow the options to be set via the environment variable, like
   // `NODE_OPTIONS`.
   kAllowedInEnvvar = 0,
   // Disallow the options to be set via the environment variable, like
   // `NODE_OPTIONS`.
   kDisallowedInEnvvar = 1,
   // Deprecated, use kAllowedInEnvvar instead.
   kAllowedInEnvironment = kAllowedInEnvvar,
   // Deprecated, use kDisallowedInEnvvar instead.
   kDisallowedInEnvironment = kDisallowedInEnvvar,
 };
 
 // Process the arguments and set up the per-process options.
 // If the `settings` is set as OptionEnvvarSettings::kAllowedInEnvvar, the
 // options that are allowed in the environment variable are processed. Options
 // that are disallowed to be set via environment variable are processed as
 // errors.
 // Otherwise all the options that are disallowed (and those are allowed) to be
 // set via environment variable are processed.
 NODE_EXTERN int ProcessGlobalArgs(std::vector<std::string>* args,
                       std::vector<std::string>* exec_args,
                       std::vector<std::string>* errors,
                       OptionEnvvarSettings settings);
 
 class NodeArrayBufferAllocator;
 
 // An ArrayBuffer::Allocator class with some Node.js-specific tweaks. If you do
 // not have to use another allocator, using this class is recommended:
 // - It supports Buffer.allocUnsafe() and Buffer.allocUnsafeSlow() with
 //   uninitialized memory.
 // - It supports transferring, rather than copying, ArrayBuffers when using
 //   MessagePorts.
 class NODE_EXTERN ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
  public:
   // If `always_debug` is true, create an ArrayBuffer::Allocator instance
   // that performs additional integrity checks (e.g. make sure that only memory
   // that was allocated by the it is also freed by it).
   // This can also be set using the --debug-arraybuffer-allocations flag.
   static std::unique_ptr<ArrayBufferAllocator> Create(
       bool always_debug = false);
 
  private:
   virtual NodeArrayBufferAllocator* GetImpl() = 0;
 
   friend class IsolateData;
 };
 
 // Legacy equivalents for ArrayBufferAllocator::Create().
 NODE_EXTERN ArrayBufferAllocator* CreateArrayBufferAllocator();
 NODE_EXTERN void FreeArrayBufferAllocator(ArrayBufferAllocator* allocator);
 
 class NODE_EXTERN IsolatePlatformDelegate {
  public:
   virtual std::shared_ptr<v8::TaskRunner> GetForegroundTaskRunner() = 0;
   virtual bool IdleTasksEnabled() = 0;
 };
 
 class NODE_EXTERN MultiIsolatePlatform : public v8::Platform {
  public:
   ~MultiIsolatePlatform() override = default;
   // Returns true if work was dispatched or executed. New tasks that are
   // posted during flushing of the queue are postponed until the next
   // flushing.
   virtual bool FlushForegroundTasks(v8::Isolate* isolate) = 0;
   virtual void DrainTasks(v8::Isolate* isolate) = 0;
 
   // This needs to be called between the calls to `Isolate::Allocate()` and
   // `Isolate::Initialize()`, so that initialization can already start
   // using the platform.
   // When using `NewIsolate()`, this is taken care of by that function.
   // This function may only be called once per `Isolate`.
   virtual void RegisterIsolate(v8::Isolate* isolate,
                                struct uv_loop_s* loop) = 0;
   // This method can be used when an application handles task scheduling on its
   // own through `IsolatePlatformDelegate`. Upon registering an isolate with
   // this overload any other method in this class with the exception of
   // `UnregisterIsolate` *must not* be used on that isolate.
   virtual void RegisterIsolate(v8::Isolate* isolate,
                                IsolatePlatformDelegate* delegate) = 0;
 
   // This function may only be called once per `Isolate`, and discard any
   // pending delayed tasks scheduled for that isolate.
   // This needs to be called right before calling `Isolate::Dispose()`.
   virtual void UnregisterIsolate(v8::Isolate* isolate) = 0;
 
   // The platform should call the passed function once all state associated
   // with the given isolate has been cleaned up. This can, but does not have to,
   // happen asynchronously.
   virtual void AddIsolateFinishedCallback(v8::Isolate* isolate,
                                           void (*callback)(void*),
                                           void* data) = 0;
 
   static std::unique_ptr<MultiIsolatePlatform> Create(
       int thread_pool_size,
       v8::TracingController* tracing_controller = nullptr,
       v8::PageAllocator* page_allocator = nullptr);
 };
 
 enum IsolateSettingsFlags {
   MESSAGE_LISTENER_WITH_ERROR_LEVEL = 1 << 0,
   DETAILED_SOURCE_POSITIONS_FOR_PROFILING = 1 << 1,
   SHOULD_NOT_SET_PROMISE_REJECTION_CALLBACK = 1 << 2,
   SHOULD_NOT_SET_PREPARE_STACK_TRACE_CALLBACK = 1 << 3,
   ALLOW_MODIFY_CODE_GENERATION_FROM_STRINGS_CALLBACK = 0, /* legacy no-op */
 };
 
 struct IsolateSettings {
   uint64_t flags = MESSAGE_LISTENER_WITH_ERROR_LEVEL |
       DETAILED_SOURCE_POSITIONS_FOR_PROFILING;
   v8::MicrotasksPolicy policy = v8::MicrotasksPolicy::kExplicit;
 
   // Error handling callbacks
   v8::Isolate::AbortOnUncaughtExceptionCallback
       should_abort_on_uncaught_exception_callback = nullptr;
   v8::FatalErrorCallback fatal_error_callback = nullptr;
   v8::OOMErrorCallback oom_error_callback = nullptr;
   v8::PrepareStackTraceCallback prepare_stack_trace_callback = nullptr;
 
   // Miscellaneous callbacks
   v8::PromiseRejectCallback promise_reject_callback = nullptr;
   v8::AllowWasmCodeGenerationCallback
       allow_wasm_code_generation_callback = nullptr;
   v8::ModifyCodeGenerationFromStringsCallback2
       modify_code_generation_from_strings_callback = nullptr;
 };
 
 // Represents a startup snapshot blob, e.g. created by passing
 // --node-snapshot-main=entry.js to the configure script at build time,
 // or by running Node.js with the --build-snapshot option.
 //
 // If used, the snapshot *must* have been built with the same Node.js
 // version and V8 flags as the version that is currently running, and will
 // be rejected otherwise.
 // The same EmbedderSnapshotData instance *must* be passed to both
 // `NewIsolate()` and `CreateIsolateData()`. The first `Environment` instance
 // should be created with an empty `context` argument and will then
 // use the main context included in the snapshot blob. It can be retrieved
 // using `GetMainContext()`. `LoadEnvironment` can receive an empty
 // `StartExecutionCallback` in this case.
 // If V8 was configured with the shared-readonly-heap option, it requires
 // all snapshots used to create `Isolate` instances to be identical.
 // This option *must* be unset by embedders who wish to use the startup
 // feature during the build step by passing the --disable-shared-readonly-heap
 // flag to the configure script.
 //
 // The snapshot *must* be kept alive during the execution of the Isolate
 // that was created using it.
 //
 // Snapshots are an *experimental* feature. In particular, the embedder API
 // exposed through this class is subject to change or removal between Node.js
 // versions, including possible API and ABI breakage.
 class EmbedderSnapshotData {
  public:
   struct DeleteSnapshotData {
     void operator()(const EmbedderSnapshotData*) const;
   };
   using Pointer =
       std::unique_ptr<const EmbedderSnapshotData, DeleteSnapshotData>;
 
   // Return an EmbedderSnapshotData object that refers to the built-in
   // snapshot of Node.js. This can have been configured through e.g.
   // --node-snapshot-main=entry.js.
   static Pointer BuiltinSnapshotData();
 
   // Return an EmbedderSnapshotData object that is based on an input file.
   // Calling this method will consume but not close the FILE* handle.
   // The FILE* handle can be closed immediately following this call.
   // If the snapshot is invalid, this returns an empty pointer.
   static Pointer FromFile(FILE* in);
   static Pointer FromBlob(const std::vector<char>& in);
   static Pointer FromBlob(std::string_view in);
 
   // Write this EmbedderSnapshotData object to an output file.
   // Calling this method will not close the FILE* handle.
   // The FILE* handle can be closed immediately following this call.
   void ToFile(FILE* out) const;
   std::vector<char> ToBlob() const;
 
   // Returns whether custom snapshots can be used. Currently, this means
   // that V8 was configured without the shared-readonly-heap feature.
   static bool CanUseCustomSnapshotPerIsolate();
 
   EmbedderSnapshotData(const EmbedderSnapshotData&) = delete;
   EmbedderSnapshotData& operator=(const EmbedderSnapshotData&) = delete;
   EmbedderSnapshotData(EmbedderSnapshotData&&) = delete;
   EmbedderSnapshotData& operator=(EmbedderSnapshotData&&) = delete;
 
  protected:
   EmbedderSnapshotData(const SnapshotData* impl, bool owns_impl);
 
  private:
   const SnapshotData* impl_;
   bool owns_impl_;
   friend struct SnapshotData;
   friend class CommonEnvironmentSetup;
 };
 
 // Overriding IsolateSettings may produce unexpected behavior
 // in Node.js core functionality, so proceed at your own risk.
 NODE_EXTERN void SetIsolateUpForNode(v8::Isolate* isolate,
                                      const IsolateSettings& settings);
 
 // Set a number of callbacks for the `isolate`, in particular the Node.js
 // uncaught exception listener.
 NODE_EXTERN void SetIsolateUpForNode(v8::Isolate* isolate);
 
 // Creates a new isolate with Node.js-specific settings.
 // This is a convenience method equivalent to using SetIsolateCreateParams(),
 // Isolate::Allocate(), MultiIsolatePlatform::RegisterIsolate(),
 // Isolate::Initialize(), and SetIsolateUpForNode().
 NODE_EXTERN v8::Isolate* NewIsolate(
     ArrayBufferAllocator* allocator,
     struct uv_loop_s* event_loop,
     MultiIsolatePlatform* platform,
     const EmbedderSnapshotData* snapshot_data = nullptr,
     const IsolateSettings& settings = {});
 NODE_EXTERN v8::Isolate* NewIsolate(
     std::shared_ptr<ArrayBufferAllocator> allocator,
     struct uv_loop_s* event_loop,
     MultiIsolatePlatform* platform,
     const EmbedderSnapshotData* snapshot_data = nullptr,
     const IsolateSettings& settings = {});
 
 // Creates a new context with Node.js-specific tweaks.
 NODE_EXTERN v8::Local<v8::Context> NewContext(
     v8::Isolate* isolate,
     v8::Local<v8::ObjectTemplate> object_template =
         v8::Local<v8::ObjectTemplate>());
 
 // Runs Node.js-specific tweaks on an already constructed context
 // Return value indicates success of operation
 NODE_EXTERN v8::Maybe<bool> InitializeContext(v8::Local<v8::Context> context);
 
 // If `platform` is passed, it will be used to register new Worker instances.
 // It can be `nullptr`, in which case creating new Workers inside of
 // Environments that use this `IsolateData` will not work.
 NODE_EXTERN IsolateData* CreateIsolateData(
     v8::Isolate* isolate,
     struct uv_loop_s* loop,
     MultiIsolatePlatform* platform = nullptr,
     ArrayBufferAllocator* allocator = nullptr,
     const EmbedderSnapshotData* snapshot_data = nullptr);
 NODE_EXTERN void FreeIsolateData(IsolateData* isolate_data);
 
 struct ThreadId {
   uint64_t id = static_cast<uint64_t>(-1);
 };
 NODE_EXTERN ThreadId AllocateEnvironmentThreadId();
 
 namespace EnvironmentFlags {
 enum Flags : uint64_t {
   kNoFlags = 0,
   // Use the default behaviour for Node.js instances.
   kDefaultFlags = 1 << 0,
   // Controls whether this Environment is allowed to affect per-process state
   // (e.g. cwd, process title, uid, etc.).
   // This is set when using kDefaultFlags.
   kOwnsProcessState = 1 << 1,
   // Set if this Environment instance is associated with the global inspector
   // handling code (i.e. listening on SIGUSR1).
   // This is set when using kDefaultFlags.
   kOwnsInspector = 1 << 2,
   // Set if Node.js should not run its own esm loader. This is needed by some
   // embedders, because it's possible for the Node.js esm loader to conflict
   // with another one in an embedder environment, e.g. Blink's in Chromium.
   kNoRegisterESMLoader = 1 << 3,
   // Set this flag to make Node.js track "raw" file descriptors, i.e. managed
   // by fs.open() and fs.close(), and close them during FreeEnvironment().
   kTrackUnmanagedFds = 1 << 4,
   // Set this flag to force hiding console windows when spawning child
   // processes. This is usually used when embedding Node.js in GUI programs on
   // Windows.
   kHideConsoleWindows = 1 << 5,
   // Set this flag to disable loading native addons via `process.dlopen`.
   // This environment flag is especially important for worker threads
   // so that a worker thread can't load a native addon even if `execArgv`
   // is overwritten and `--no-addons` is not specified but was specified
   // for this Environment instance.
   kNoNativeAddons = 1 << 6,
   // Set this flag to disable searching modules from global paths like
   // $HOME/.node_modules and $NODE_PATH. This is used by standalone apps that
   // do not expect to have their behaviors changed because of globally
   // installed modules.
   kNoGlobalSearchPaths = 1 << 7,
   // Do not export browser globals like setTimeout, console, etc.
   kNoBrowserGlobals = 1 << 8,
   // Controls whether or not the Environment should call V8Inspector::create().
   // This control is needed by embedders who may not want to initialize the V8
   // inspector in situations where one has already been created,
   // e.g. Blink's in Chromium.
   kNoCreateInspector = 1 << 9,
   // Controls whether or not the InspectorAgent for this Environment should
   // call StartDebugSignalHandler. This control is needed by embedders who may
   // not want to allow other processes to start the V8 inspector.
   kNoStartDebugSignalHandler = 1 << 10,
   // Controls whether the InspectorAgent created for this Environment waits for
   // Inspector frontend events during the Environment creation. It's used to
   // call node::Stop(env) on a Worker thread that is waiting for the events.
   kNoWaitForInspectorFrontend = 1 << 11
 };
 }  // namespace EnvironmentFlags
 
 enum class SnapshotFlags : uint32_t {
   kDefault = 0,
   // Whether code cache should be generated as part of the snapshot.
   // Code cache reduces the time spent on compiling functions included
   // in the snapshot at the expense of a bigger snapshot size and
   // potentially breaking portability of the snapshot.
   kWithoutCodeCache = 1 << 0,
 };
 
 struct SnapshotConfig {
   SnapshotFlags flags = SnapshotFlags::kDefault;
 
   // When builder_script_path is std::nullopt, the snapshot is generated as a
   // built-in snapshot instead of a custom one, and it's expected that the
   // built-in snapshot only contains states that reproduce in every run of the
   // application. The event loop won't be run when generating a built-in
   // snapshot, so asynchronous operations should be avoided.
   //
   // When builder_script_path is an std::string, it should match args[1]
   // passed to CreateForSnapshotting(). The embedder is also expected to use
   // LoadEnvironment() to run a script matching this path. In that case the
   // snapshot is generated as a custom snapshot and the event loop is run, so
   // the snapshot builder can execute asynchronous operations as long as they
   // are run to completion when the snapshot is taken.
   std::optional<std::string> builder_script_path;
 };
 
 struct InspectorParentHandle {
   virtual ~InspectorParentHandle() = default;
 };
 
 // TODO(addaleax): Maybe move per-Environment options parsing here.
 // Returns nullptr when the Environment cannot be created e.g. there are
 // pending JavaScript exceptions.
 // `context` may be empty if an `EmbedderSnapshotData` instance was provided
 // to `NewIsolate()` and `CreateIsolateData()`.
 NODE_EXTERN Environment* CreateEnvironment(
     IsolateData* isolate_data,
     v8::Local<v8::Context> context,
     const std::vector<std::string>& args,
     const std::vector<std::string>& exec_args,
     EnvironmentFlags::Flags flags = EnvironmentFlags::kDefaultFlags,
     ThreadId thread_id = {} /* allocates a thread id automatically */,
     std::unique_ptr<InspectorParentHandle> inspector_parent_handle = {});
 
 // Returns a handle that can be passed to `LoadEnvironment()`, making the
 // child Environment accessible to the inspector as if it were a Node.js Worker.
 // `child_thread_id` can be created using `AllocateEnvironmentThreadId()`
 // and then later passed on to `CreateEnvironment()` to create the child
 // Environment, together with the inspector handle.
 // This method should not be called while the parent Environment is active
 // on another thread.
 NODE_EXTERN std::unique_ptr<InspectorParentHandle> GetInspectorParentHandle(
     Environment* parent_env,
     ThreadId child_thread_id,
     const char* child_url);
 
 NODE_EXTERN std::unique_ptr<InspectorParentHandle> GetInspectorParentHandle(
     Environment* parent_env,
     ThreadId child_thread_id,
     const char* child_url,
     const char* name);
 
 struct StartExecutionCallbackInfo {
   v8::Local<v8::Object> process_object;
   v8::Local<v8::Function> native_require;
   v8::Local<v8::Function> run_cjs;
 };
 
 using StartExecutionCallback =
     std::function<v8::MaybeLocal<v8::Value>(const StartExecutionCallbackInfo&)>;
 using EmbedderPreloadCallback =
     std::function<void(Environment* env,
                        v8::Local<v8::Value> process,
                        v8::Local<v8::Value> require)>;
 
 // Run initialization for the environment.
 //
 // The |preload| function, usually used by embedders to inject scripts,
 // will be run by Node.js before Node.js executes the entry point.
 // The function is guaranteed to run before the user land module loader running
 // any user code, so it is safe to assume that at this point, no user code has
 // been run yet.
 // The function will be executed with preload(process, require), and the passed
 // require function has access to internal Node.js modules. There is no
 // stability guarantee about the internals exposed to the internal require
 // function. Expect breakages when updating Node.js versions if the embedder
 // imports internal modules with the internal require function.
 // Worker threads created in the environment will also respect The |preload|
 // function, so make sure the function is thread-safe.
 NODE_EXTERN v8::MaybeLocal<v8::Value> LoadEnvironment(
     Environment* env,
     StartExecutionCallback cb,
     EmbedderPreloadCallback preload = nullptr);
 NODE_EXTERN v8::MaybeLocal<v8::Value> LoadEnvironment(
     Environment* env,
     std::string_view main_script_source_utf8,
     EmbedderPreloadCallback preload = nullptr);
 NODE_EXTERN void FreeEnvironment(Environment* env);
 
 // Set a callback that is called when process.exit() is called from JS,
 // overriding the default handler.
 // It receives the Environment* instance and the exit code as arguments.
 // This could e.g. call Stop(env); in order to terminate execution and stop
 // the event loop.
 // The default handler disposes of the global V8 platform instance, if one is
 // being used, and calls exit().
 NODE_EXTERN void SetProcessExitHandler(
     Environment* env,
     std::function<void(Environment*, int)>&& handler);
 NODE_EXTERN void DefaultProcessExitHandler(Environment* env, int exit_code);
 
 // This may return nullptr if context is not associated with a Node instance.
 NODE_EXTERN Environment* GetCurrentEnvironment(v8::Local<v8::Context> context);
 NODE_EXTERN IsolateData* GetEnvironmentIsolateData(Environment* env);
 NODE_EXTERN ArrayBufferAllocator* GetArrayBufferAllocator(IsolateData* data);
 // This is mostly useful for Environment* instances that were created through
 // a snapshot and have a main context that was read from that snapshot.
 NODE_EXTERN v8::Local<v8::Context> GetMainContext(Environment* env);
 
 [[noreturn]] NODE_EXTERN void OnFatalError(const char* location,
                                            const char* message);
 NODE_EXTERN void PromiseRejectCallback(v8::PromiseRejectMessage message);
 NODE_EXTERN bool AllowWasmCodeGenerationCallback(v8::Local<v8::Context> context,
                                             v8::Local<v8::String>);
 NODE_EXTERN bool ShouldAbortOnUncaughtException(v8::Isolate* isolate);
 NODE_EXTERN v8::MaybeLocal<v8::Value> PrepareStackTraceCallback(
     v8::Local<v8::Context> context,
     v8::Local<v8::Value> exception,
     v8::Local<v8::Array> trace);
 
 // Writes a diagnostic report to a file. If filename is not provided, the
 // default filename includes the date, time, PID, and a sequence number.
 // The report's JavaScript stack trace is taken from err, if present.
 // If isolate is nullptr, no information about the JavaScript environment
 // is included in the report.
 // Returns the filename of the written report.
 NODE_EXTERN std::string TriggerNodeReport(v8::Isolate* isolate,
                                           const char* message,
                                           const char* trigger,
                                           const std::string& filename,
                                           v8::Local<v8::Value> error);
 NODE_EXTERN std::string TriggerNodeReport(Environment* env,
                                           const char* message,
                                           const char* trigger,
                                           const std::string& filename,
                                           v8::Local<v8::Value> error);
 NODE_EXTERN void GetNodeReport(v8::Isolate* isolate,
                                const char* message,
                                const char* trigger,
                                v8::Local<v8::Value> error,
                                std::ostream& out);
 NODE_EXTERN void GetNodeReport(Environment* env,
                                const char* message,
                                const char* trigger,
                                v8::Local<v8::Value> error,
                                std::ostream& out);
 
 // This returns the MultiIsolatePlatform used for an Environment or IsolateData
 // instance, if one exists.
 NODE_EXTERN MultiIsolatePlatform* GetMultiIsolatePlatform(Environment* env);
 NODE_EXTERN MultiIsolatePlatform* GetMultiIsolatePlatform(IsolateData* env);
 
 NODE_DEPRECATED("Use MultiIsolatePlatform::Create() instead",
     NODE_EXTERN MultiIsolatePlatform* CreatePlatform(
         int thread_pool_size,
         v8::TracingController* tracing_controller));
 NODE_DEPRECATED("Use MultiIsolatePlatform::Create() instead",
     NODE_EXTERN void FreePlatform(MultiIsolatePlatform* platform));
 
 // Get/set the currently active tracing controller. Using CreatePlatform()
 // will implicitly set this by default. This is global and should be initialized
 // along with the v8::Platform instance that is being used. `controller`
 // is allowed to be `nullptr`.
 // This is used for tracing events from Node.js itself. V8 uses the tracing
 // controller returned from the active `v8::Platform` instance.
 NODE_EXTERN v8::TracingController* GetTracingController();
 NODE_EXTERN void SetTracingController(v8::TracingController* controller);
 
 // Run `process.emit('beforeExit')` as it would usually happen when Node.js is
 // run in standalone mode.
 NODE_EXTERN v8::Maybe<bool> EmitProcessBeforeExit(Environment* env);
 NODE_DEPRECATED("Use Maybe version (EmitProcessBeforeExit) instead",
     NODE_EXTERN void EmitBeforeExit(Environment* env));
 // Run `process.emit('exit')` as it would usually happen when Node.js is run
 // in standalone mode. The return value corresponds to the exit code.
 NODE_EXTERN v8::Maybe<int> EmitProcessExit(Environment* env);
 NODE_DEPRECATED("Use Maybe version (EmitProcessExit) instead",
     NODE_EXTERN int EmitExit(Environment* env));
 
 // Runs hooks added through `AtExit()`. This is part of `FreeEnvironment()`,
 // so calling it manually is typically not necessary.
 NODE_EXTERN void RunAtExit(Environment* env);
 
 // This may return nullptr if the current v8::Context is not associated
 // with a Node instance.
 NODE_EXTERN struct uv_loop_s* GetCurrentEventLoop(v8::Isolate* isolate);
 
 // Runs the main loop for a given Environment. This roughly performs the
 // following steps:
 // 1. Call uv_run() on the event loop until it is drained.
 // 2. Call platform->DrainTasks() on the associated platform/isolate.
 //   3. If the event loop is alive again, go to Step 1.
 // 4. Call EmitProcessBeforeExit().
 //   5. If the event loop is alive again, go to Step 1.
 // 6. Call EmitProcessExit() and forward the return value.
 // If at any point node::Stop() is called, the function will attempt to return
 // as soon as possible, returning an empty `Maybe`.
 // This function only works if `env` has an associated `MultiIsolatePlatform`.
 NODE_EXTERN v8::Maybe<int> SpinEventLoop(Environment* env);
 
 NODE_EXTERN std::string GetAnonymousMainPath();
 
 class NODE_EXTERN CommonEnvironmentSetup {
  public:
   ~CommonEnvironmentSetup();
 
   // Create a new CommonEnvironmentSetup, that is, a group of objects that
   // together form the typical setup for a single Node.js Environment instance.
   // If any error occurs, `*errors` will be populated and the returned pointer
   // will be empty.
   // env_args will be passed through as arguments to CreateEnvironment(), after
   // `isolate_data` and `context`.
   template <typename... EnvironmentArgs>
   static std::unique_ptr<CommonEnvironmentSetup> Create(
       MultiIsolatePlatform* platform,
       std::vector<std::string>* errors,
       EnvironmentArgs&&... env_args);
   template <typename... EnvironmentArgs>
   static std::unique_ptr<CommonEnvironmentSetup> CreateFromSnapshot(
       MultiIsolatePlatform* platform,
       std::vector<std::string>* errors,
       const EmbedderSnapshotData* snapshot_data,
       EnvironmentArgs&&... env_args);
 
   // Create an embedding setup which will be used for creating a snapshot
   // using CreateSnapshot().
   //
   // This will create and attach a v8::SnapshotCreator to this instance,
   // and the same restrictions apply to this instance that also apply to
   // other V8 snapshotting environments.
   // Not all Node.js APIs are supported in this case. Currently, there is
   // no support for native/host objects other than Node.js builtins
   // in the snapshot.
   //
   // If the embedder wants to use LoadEnvironment() later to run a snapshot
   // builder script they should make sure args[1] contains the path of the
   // snapshot script, which will be used to create __filename and __dirname
   // in the context where the builder script is run. If they do not want to
   // include the build-time paths into the snapshot, use the string returned
   // by GetAnonymousMainPath() as args[1] to anonymize the script.
   //
   // Snapshots are an *experimental* feature. In particular, the embedder API
   // exposed through this class is subject to change or removal between Node.js
   // versions, including possible API and ABI breakage.
   static std::unique_ptr<CommonEnvironmentSetup> CreateForSnapshotting(
       MultiIsolatePlatform* platform,
       std::vector<std::string>* errors,
       const std::vector<std::string>& args = {},
       const std::vector<std::string>& exec_args = {},
       const SnapshotConfig& snapshot_config = {});
   EmbedderSnapshotData::Pointer CreateSnapshot();
 
   struct uv_loop_s* event_loop() const;
   v8::SnapshotCreator* snapshot_creator();
   // Empty for snapshotting environments.
   std::shared_ptr<ArrayBufferAllocator> array_buffer_allocator() const;
   v8::Isolate* isolate() const;
   IsolateData* isolate_data() const;
   Environment* env() const;
   v8::Local<v8::Context> context() const;
 
   CommonEnvironmentSetup(const CommonEnvironmentSetup&) = delete;
   CommonEnvironmentSetup& operator=(const CommonEnvironmentSetup&) = delete;
   CommonEnvironmentSetup(CommonEnvironmentSetup&&) = delete;
   CommonEnvironmentSetup& operator=(CommonEnvironmentSetup&&) = delete;
 
  private:
   enum Flags : uint32_t {
     kNoFlags = 0,
     kIsForSnapshotting = 1,
   };
 
   struct Impl;
   Impl* impl_;
 
   CommonEnvironmentSetup(
       MultiIsolatePlatform*,
       std::vector<std::string>*,
       std::function<Environment*(const CommonEnvironmentSetup*)>);
   CommonEnvironmentSetup(
       MultiIsolatePlatform*,
       std::vector<std::string>*,
       const EmbedderSnapshotData*,
       uint32_t flags,
       std::function<Environment*(const CommonEnvironmentSetup*)>,
       const SnapshotConfig* config = nullptr);
 };
 
 // Implementation for CommonEnvironmentSetup::Create
 template <typename... EnvironmentArgs>
 std::unique_ptr<CommonEnvironmentSetup> CommonEnvironmentSetup::Create(
     MultiIsolatePlatform* platform,
     std::vector<std::string>* errors,
     EnvironmentArgs&&... env_args) {
   auto ret = std::unique_ptr<CommonEnvironmentSetup>(new CommonEnvironmentSetup(
       platform, errors,
       [&](const CommonEnvironmentSetup* setup) -> Environment* {
         return CreateEnvironment(
             setup->isolate_data(), setup->context(),
             std::forward<EnvironmentArgs>(env_args)...);
       }));
   if (!errors->empty()) ret.reset();
   return ret;
 }
 
 // Implementation for ::CreateFromSnapshot -- the ::Create() method
 // could call this with a nullptr snapshot_data in a major version.
 template <typename... EnvironmentArgs>
 std::unique_ptr<CommonEnvironmentSetup>
 CommonEnvironmentSetup::CreateFromSnapshot(
     MultiIsolatePlatform* platform,
     std::vector<std::string>* errors,
     const EmbedderSnapshotData* snapshot_data,
     EnvironmentArgs&&... env_args) {
   auto ret = std::unique_ptr<CommonEnvironmentSetup>(new CommonEnvironmentSetup(
       platform,
       errors,
       snapshot_data,
       Flags::kNoFlags,
       [&](const CommonEnvironmentSetup* setup) -> Environment* {
         return CreateEnvironment(setup->isolate_data(),
                                  setup->context(),
                                  std::forward<EnvironmentArgs>(env_args)...);
       }));
   if (!errors->empty()) ret.reset();
   return ret;
 }
 
 /* Converts a unixtime to V8 Date */
 NODE_DEPRECATED("Use v8::Date::New() directly",
                 inline v8::Local<v8::Value> NODE_UNIXTIME_V8(double time) {
                   return v8::Date::New(
                              v8::Isolate::GetCurrent()->GetCurrentContext(),
                              1000 * time)
                       .ToLocalChecked();
                 })
 #define NODE_UNIXTIME_V8 node::NODE_UNIXTIME_V8
 NODE_DEPRECATED("Use v8::Date::ValueOf() directly",
                 inline double NODE_V8_UNIXTIME(v8::Local<v8::Date> date) {
   return date->ValueOf() / 1000;
 })
 #define NODE_V8_UNIXTIME node::NODE_V8_UNIXTIME
 
 #define NODE_DEFINE_CONSTANT(target, constant)                                 \
   do {                                                                         \
     v8::Isolate* isolate = target->GetIsolate();                               \
     v8::Local<v8::Context> context = isolate->GetCurrentContext();             \
     v8::Local<v8::String> constant_name = v8::String::NewFromUtf8Literal(      \
         isolate, #constant, v8::NewStringType::kInternalized);                 \
     v8::Local<v8::Number> constant_value =                                     \
         v8::Number::New(isolate, static_cast<double>(constant));               \
     v8::PropertyAttribute constant_attributes =                                \
         static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete);     \
     (target)                                                                   \
         ->DefineOwnProperty(                                                   \
             context, constant_name, constant_value, constant_attributes)       \
         .Check();                                                              \
   } while (0)
 
 #define NODE_DEFINE_HIDDEN_CONSTANT(target, constant)                          \
   do {                                                                         \
     v8::Isolate* isolate = target->GetIsolate();                               \
     v8::Local<v8::Context> context = isolate->GetCurrentContext();             \
     v8::Local<v8::String> constant_name = v8::String::NewFromUtf8Literal(      \
         isolate, #constant, v8::NewStringType::kInternalized);                 \
     v8::Local<v8::Number> constant_value =                                     \
         v8::Number::New(isolate, static_cast<double>(constant));               \
     v8::PropertyAttribute constant_attributes =                                \
         static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete |     \
                                            v8::DontEnum);                      \
     (target)                                                                   \
         ->DefineOwnProperty(                                                   \
             context, constant_name, constant_value, constant_attributes)       \
         .Check();                                                              \
   } while (0)
 
 // Used to be a macro, hence the uppercase name.
 inline void NODE_SET_METHOD(v8::Local<v8::Template> recv,
                             const char* name,
                             v8::FunctionCallback callback) {
   v8::Isolate* isolate = v8::Isolate::GetCurrent();
   v8::HandleScope handle_scope(isolate);
   v8::Local<v8::FunctionTemplate> t = v8::FunctionTemplate::New(isolate,
                                                                 callback);
   v8::Local<v8::String> fn_name = v8::String::NewFromUtf8(isolate, name,
       v8::NewStringType::kInternalized).ToLocalChecked();
   t->SetClassName(fn_name);
   recv->Set(fn_name, t);
 }
 
 // Used to be a macro, hence the uppercase name.
 inline void NODE_SET_METHOD(v8::Local<v8::Object> recv,
                             const char* name,
                             v8::FunctionCallback callback) {
   v8::Isolate* isolate = v8::Isolate::GetCurrent();
   v8::HandleScope handle_scope(isolate);
   v8::Local<v8::Context> context = isolate->GetCurrentContext();
   v8::Local<v8::FunctionTemplate> t = v8::FunctionTemplate::New(isolate,
                                                                 callback);
   v8::Local<v8::Function> fn = t->GetFunction(context).ToLocalChecked();
   v8::Local<v8::String> fn_name = v8::String::NewFromUtf8(isolate, name,
       v8::NewStringType::kInternalized).ToLocalChecked();
   fn->SetName(fn_name);
   recv->Set(context, fn_name, fn).Check();
 }
 #define NODE_SET_METHOD node::NODE_SET_METHOD
 
 // Used to be a macro, hence the uppercase name.
 // Not a template because it only makes sense for FunctionTemplates.
 inline void NODE_SET_PROTOTYPE_METHOD(v8::Local<v8::FunctionTemplate> recv,
                                       const char* name,
                                       v8::FunctionCallback callback) {
   v8::Isolate* isolate = v8::Isolate::GetCurrent();
   v8::HandleScope handle_scope(isolate);
   v8::Local<v8::Signature> s = v8::Signature::New(isolate, recv);
   v8::Local<v8::FunctionTemplate> t =
       v8::FunctionTemplate::New(isolate, callback, v8::Local<v8::Value>(), s);
   v8::Local<v8::String> fn_name = v8::String::NewFromUtf8(isolate, name,
       v8::NewStringType::kInternalized).ToLocalChecked();
   t->SetClassName(fn_name);
   recv->PrototypeTemplate()->Set(fn_name, t);
 }
 #define NODE_SET_PROTOTYPE_METHOD node::NODE_SET_PROTOTYPE_METHOD
 
 // BINARY is a deprecated alias of LATIN1.
 // BASE64URL is not currently exposed to the JavaScript side.
 enum encoding {
   ASCII,
   UTF8,
   BASE64,
   UCS2,
   BINARY,
   HEX,
   BUFFER,
   BASE64URL,
   LATIN1 = BINARY
 };
 
 NODE_EXTERN enum encoding ParseEncoding(
     v8::Isolate* isolate,
     v8::Local<v8::Value> encoding_v,
     enum encoding default_encoding = LATIN1);
 
 NODE_EXTERN void FatalException(v8::Isolate* isolate,
                                 const v8::TryCatch& try_catch);
 
 NODE_EXTERN v8::Local<v8::Value> Encode(v8::Isolate* isolate,
                                         const char* buf,
                                         size_t len,
                                         enum encoding encoding = LATIN1);
 
 // Warning: This reverses endianness on Big Endian platforms, even though the
 // signature using uint16_t implies that it should not.
 NODE_EXTERN v8::Local<v8::Value> Encode(v8::Isolate* isolate,
                                         const uint16_t* buf,
                                         size_t len);
 
 // Returns -1 if the handle was not valid for decoding
 NODE_EXTERN ssize_t DecodeBytes(v8::Isolate* isolate,
                                 v8::Local<v8::Value>,
                                 enum encoding encoding = LATIN1);
 // returns bytes written.
 NODE_EXTERN ssize_t DecodeWrite(v8::Isolate* isolate,
                                 char* buf,
                                 size_t buflen,
                                 v8::Local<v8::Value>,
                                 enum encoding encoding = LATIN1);
 #ifdef _WIN32
 NODE_EXTERN v8::Local<v8::Value> WinapiErrnoException(
     v8::Isolate* isolate,
     int errorno,
     const char* syscall = nullptr,
     const char* msg = "",
     const char* path = nullptr);
 #endif
 
 const char* signo_string(int errorno);
 
 
 typedef void (*addon_register_func)(
     v8::Local<v8::Object> exports,
     v8::Local<v8::Value> module,
     void* priv);
 
 typedef void (*addon_context_register_func)(
     v8::Local<v8::Object> exports,
     v8::Local<v8::Value> module,
     v8::Local<v8::Context> context,
     void* priv);
 
 enum ModuleFlags {
   kLinked = 0x02
 };
 
 struct node_module {
   int nm_version;
   unsigned int nm_flags;
   void* nm_dso_handle;
   const char* nm_filename;
   node::addon_register_func nm_register_func;
   node::addon_context_register_func nm_context_register_func;
   const char* nm_modname;
   void* nm_priv;
   struct node_module* nm_link;
 };
 
 extern "C" NODE_EXTERN void node_module_register(void* mod);
 
 #ifdef _WIN32
 # define NODE_MODULE_EXPORT __declspec(dllexport)
 #else
 # define NODE_MODULE_EXPORT __attribute__((visibility("default")))
 #endif
 
 #ifdef NODE_SHARED_MODE
 # define NODE_CTOR_PREFIX
 #else
 # define NODE_CTOR_PREFIX static
 #endif
 
 #if defined(_MSC_VER)
 #define NODE_C_CTOR(fn)                                               \
   NODE_CTOR_PREFIX void __cdecl fn(void);                             \
   namespace {                                                         \
   struct fn##_ {                                                      \
     fn##_() { fn(); };                                                \
   } fn##_v_;                                                          \
   }                                                                   \
   NODE_CTOR_PREFIX void __cdecl fn(void)
 #else
 #define NODE_C_CTOR(fn)                                               \
   NODE_CTOR_PREFIX void fn(void) __attribute__((constructor));        \
   NODE_CTOR_PREFIX void fn(void)
 #endif
 
 #define NODE_MODULE_X(modname, regfunc, priv, flags)                  \
   extern "C" {                                                        \
     static node::node_module _module =                                \
     {                                                                 \
       NODE_MODULE_VERSION,                                            \
       flags,                                                          \
       NULL,  /* NOLINT (readability/null_usage) */                    \
       __FILE__,                                                       \
       (node::addon_register_func) (regfunc),                          \
       NULL,  /* NOLINT (readability/null_usage) */                    \
       NODE_STRINGIFY(modname),                                        \
       priv,                                                           \
       NULL   /* NOLINT (readability/null_usage) */                    \
     };                                                                \
     NODE_C_CTOR(_register_ ## modname) {                              \
       node_module_register(&_module);                                 \
     }                                                                 \
   }
 
 #define NODE_MODULE_CONTEXT_AWARE_X(modname, regfunc, priv, flags)    \
   extern "C" {                                                        \
     static node::node_module _module =                                \
     {                                                                 \
       NODE_MODULE_VERSION,                                            \
       flags,                                                          \
       NULL,  /* NOLINT (readability/null_usage) */                    \
       __FILE__,                                                       \
       NULL,  /* NOLINT (readability/null_usage) */                    \
       (node::addon_context_register_func) (regfunc),                  \
       NODE_STRINGIFY(modname),                                        \
       priv,                                                           \
       NULL  /* NOLINT (readability/null_usage) */                     \
     };                                                                \
     NODE_C_CTOR(_register_ ## modname) {                              \
       node_module_register(&_module);                                 \
     }                                                                 \
   }
 
 // Usage: `NODE_MODULE(NODE_GYP_MODULE_NAME, InitializerFunction)`
 // If no NODE_MODULE is declared, Node.js looks for the well-known
 // symbol `node_register_module_v${NODE_MODULE_VERSION}`.
 #define NODE_MODULE(modname, regfunc)                                 \
   NODE_MODULE_X(modname, regfunc, NULL, 0)  // NOLINT (readability/null_usage)
 
 #define NODE_MODULE_CONTEXT_AWARE(modname, regfunc)                   \
   /* NOLINTNEXTLINE (readability/null_usage) */                       \
   NODE_MODULE_CONTEXT_AWARE_X(modname, regfunc, NULL, 0)
 
 // Embedders can use this type of binding for statically linked native bindings.
 // It is used the same way addon bindings are used, except that linked bindings
 // can be accessed through `process._linkedBinding(modname)`.
 #define NODE_MODULE_LINKED(modname, regfunc)                               \
   /* NOLINTNEXTLINE (readability/null_usage) */                            \
   NODE_MODULE_CONTEXT_AWARE_X(modname, regfunc, NULL,                      \
                               node::ModuleFlags::kLinked)
 
 /*
  * For backward compatibility in add-on modules.
  */
 #define NODE_MODULE_DECL /* nothing */
 
 #define NODE_MODULE_INITIALIZER_BASE node_register_module_v
 
 #define NODE_MODULE_INITIALIZER_X(base, version)                      \
     NODE_MODULE_INITIALIZER_X_HELPER(base, version)
 
 #define NODE_MODULE_INITIALIZER_X_HELPER(base, version) base##version
 
 #define NODE_MODULE_INITIALIZER                                       \
   NODE_MODULE_INITIALIZER_X(NODE_MODULE_INITIALIZER_BASE,             \
       NODE_MODULE_VERSION)
 
 #define NODE_MODULE_INIT()                                            \
   extern "C" NODE_MODULE_EXPORT void                                  \
   NODE_MODULE_INITIALIZER(v8::Local<v8::Object> exports,              \
                           v8::Local<v8::Value> module,                \
                           v8::Local<v8::Context> context);            \
   NODE_MODULE_CONTEXT_AWARE(NODE_GYP_MODULE_NAME,                     \
                             NODE_MODULE_INITIALIZER)                  \
   void NODE_MODULE_INITIALIZER(v8::Local<v8::Object> exports,         \
                                v8::Local<v8::Value> module,           \
                                v8::Local<v8::Context> context)
 
 // Allows embedders to add a binding to the current Environment* that can be
 // accessed through process._linkedBinding() in the target Environment and all
 // Worker threads that it creates.
 // In each variant, the registration function needs to be usable at least for
 // the time during which the Environment exists.
 NODE_EXTERN void AddLinkedBinding(Environment* env, const node_module& mod);
 NODE_EXTERN void AddLinkedBinding(Environment* env,
                                   const struct napi_module& mod);
 NODE_EXTERN void AddLinkedBinding(Environment* env,
                                   const char* name,
                                   addon_context_register_func fn,
                                   void* priv);
 NODE_EXTERN void AddLinkedBinding(
     Environment* env,
     const char* name,
     napi_addon_register_func fn,
     int32_t module_api_version = NODE_API_DEFAULT_MODULE_API_VERSION);
 
 /* Registers a callback with the passed-in Environment instance. The callback
  * is called after the event loop exits, but before the VM is disposed.
  * Callbacks are run in reverse order of registration, i.e. newest first.
  */
 NODE_EXTERN void AtExit(Environment* env,
                         void (*cb)(void* arg),
                         void* arg);
 
 typedef double async_id;
 struct async_context {
   ::node::async_id async_id;
   ::node::async_id trigger_async_id;
 };
 
 /* This is a lot like node::AtExit, except that the hooks added via this
  * function are run before the AtExit ones and will always be registered
  * for the current Environment instance.
  * These functions are safe to use in an addon supporting multiple
  * threads/isolates. */
 NODE_EXTERN void AddEnvironmentCleanupHook(v8::Isolate* isolate,
                                            void (*fun)(void* arg),
                                            void* arg);
 
 NODE_EXTERN void RemoveEnvironmentCleanupHook(v8::Isolate* isolate,
                                               void (*fun)(void* arg),
                                               void* arg);
 
 /* These are async equivalents of the above. After the cleanup hook is invoked,
  * `cb(cbarg)` *must* be called, and attempting to remove the cleanup hook will
  * have no effect. */
 struct ACHHandle;
 struct NODE_EXTERN DeleteACHHandle { void operator()(ACHHandle*) const; };
 typedef std::unique_ptr<ACHHandle, DeleteACHHandle> AsyncCleanupHookHandle;
 
 /* This function is not intended to be used externally, it exists to aid in
  * keeping ABI compatibility between Node and Electron. */
 NODE_EXTERN ACHHandle* AddEnvironmentCleanupHookInternal(
     v8::Isolate* isolate,
     void (*fun)(void* arg, void (*cb)(void*), void* cbarg),
     void* arg);
 inline AsyncCleanupHookHandle AddEnvironmentCleanupHook(
     v8::Isolate* isolate,
     void (*fun)(void* arg, void (*cb)(void*), void* cbarg),
     void* arg) {
   return AsyncCleanupHookHandle(AddEnvironmentCleanupHookInternal(isolate, fun,
       arg));
 }
 
 /* This function is not intended to be used externally, it exists to aid in
  * keeping ABI compatibility between Node and Electron. */
 NODE_EXTERN void RemoveEnvironmentCleanupHookInternal(ACHHandle* holder);
 inline void RemoveEnvironmentCleanupHook(AsyncCleanupHookHandle holder) {
   RemoveEnvironmentCleanupHookInternal(holder.get());
 }
 
 // This behaves like V8's Isolate::RequestInterrupt(), but also wakes up
 // the event loop if it is currently idle. Interrupt requests are drained
 // in `FreeEnvironment()`. The passed callback can not call back into
 // JavaScript.
 // This function can be called from any thread.
 NODE_EXTERN void RequestInterrupt(Environment* env,
                                   void (*fun)(void* arg),
                                   void* arg);
 
 /* Returns the id of the current execution context. If the return value is
  * zero then no execution has been set. This will happen if the user handles
  * I/O from native code. */
 NODE_EXTERN async_id AsyncHooksGetExecutionAsyncId(v8::Isolate* isolate);
 
 /* Returns the id of the current execution context. If the return value is
  * zero then no execution has been set. This will happen if the user handles
  * I/O from native code. */
 NODE_EXTERN async_id
 AsyncHooksGetExecutionAsyncId(v8::Local<v8::Context> context);
 
 /* Return same value as async_hooks.triggerAsyncId(); */
 NODE_EXTERN async_id AsyncHooksGetTriggerAsyncId(v8::Isolate* isolate);
 
 /* If the native API doesn't inherit from the helper class then the callbacks
  * must be triggered manually. This triggers the init() callback. The return
  * value is the async id assigned to the resource.
  *
  * The `trigger_async_id` parameter should correspond to the resource which is
  * creating the new resource, which will usually be the return value of
  * `AsyncHooksGetTriggerAsyncId()`. */
 NODE_EXTERN async_context EmitAsyncInit(v8::Isolate* isolate,
                                         v8::Local<v8::Object> resource,
                                         const char* name,
                                         async_id trigger_async_id = -1);
 
 NODE_EXTERN async_context EmitAsyncInit(v8::Isolate* isolate,
                                         v8::Local<v8::Object> resource,
                                         v8::Local<v8::String> name,
                                         async_id trigger_async_id = -1);
 
 /* Emit the destroy() callback. The overload taking an `Environment*` argument
  * should be used when the Isolate’s current Context is not associated with
  * a Node.js Environment, or when there is no current Context, for example
  * when calling this function during garbage collection. In that case, the
  * `Environment*` value should have been acquired previously, e.g. through
  * `GetCurrentEnvironment()`. */
 NODE_EXTERN void EmitAsyncDestroy(v8::Isolate* isolate,
                                   async_context asyncContext);
 NODE_EXTERN void EmitAsyncDestroy(Environment* env,
                                   async_context asyncContext);
 
 class InternalCallbackScope;
 
 /* This class works like `MakeCallback()` in that it sets up a specific
  * asyncContext as the current one and informs the async_hooks and domains
  * modules that this context is currently active.
  *
  * `MakeCallback()` is a wrapper around this class as well as
  * `Function::Call()`. Either one of these mechanisms needs to be used for
  * top-level calls into JavaScript (i.e. without any existing JS stack).
  *
  * This object should be stack-allocated to ensure that it is contained in a
  * valid HandleScope.
  *
  * Exceptions happening within this scope will be treated like uncaught
  * exceptions. If this behaviour is undesirable, a new `v8::TryCatch` scope
  * needs to be created inside of this scope.
  */
 class NODE_EXTERN CallbackScope {
  public:
   CallbackScope(v8::Isolate* isolate,
                 v8::Local<v8::Object> resource,
                 async_context asyncContext);
   CallbackScope(Environment* env,
                 v8::Local<v8::Object> resource,
                 async_context asyncContext);
   ~CallbackScope();
 
   void operator=(const CallbackScope&) = delete;
   void operator=(CallbackScope&&) = delete;
   CallbackScope(const CallbackScope&) = delete;
   CallbackScope(CallbackScope&&) = delete;
 
  private:
   InternalCallbackScope* private_;
   v8::TryCatch try_catch_;
 };
 
 /* An API specific to emit before/after callbacks is unnecessary because
  * MakeCallback will automatically call them for you.
  *
  * These methods may create handles on their own, so run them inside a
  * HandleScope.
  *
  * `asyncId` and `triggerAsyncId` should correspond to the values returned by
  * `EmitAsyncInit()` and `AsyncHooksGetTriggerAsyncId()`, respectively, when the
  * invoking resource was created. If these values are unknown, 0 can be passed.
  * */
 NODE_EXTERN
 v8::MaybeLocal<v8::Value> MakeCallback(v8::Isolate* isolate,
                                        v8::Local<v8::Object> recv,
                                        v8::Local<v8::Function> callback,
                                        int argc,
                                        v8::Local<v8::Value>* argv,
                                        async_context asyncContext);
 NODE_EXTERN
 v8::MaybeLocal<v8::Value> MakeCallback(v8::Isolate* isolate,
                                        v8::Local<v8::Object> recv,
                                        const char* method,
                                        int argc,
                                        v8::Local<v8::Value>* argv,
                                        async_context asyncContext);
 NODE_EXTERN
 v8::MaybeLocal<v8::Value> MakeCallback(v8::Isolate* isolate,
                                        v8::Local<v8::Object> recv,
                                        v8::Local<v8::String> symbol,
                                        int argc,
                                        v8::Local<v8::Value>* argv,
                                        async_context asyncContext);
 
 /* Helper class users can optionally inherit from. If
  * `AsyncResource::MakeCallback()` is used, then all four callbacks will be
  * called automatically. */
 class NODE_EXTERN AsyncResource {
  public:
   AsyncResource(v8::Isolate* isolate,
                 v8::Local<v8::Object> resource,
                 const char* name,
                 async_id trigger_async_id = -1);
 
   virtual ~AsyncResource();
 
   AsyncResource(const AsyncResource&) = delete;
   void operator=(const AsyncResource&) = delete;
 
   v8::MaybeLocal<v8::Value> MakeCallback(
       v8::Local<v8::Function> callback,
       int argc,
       v8::Local<v8::Value>* argv);
 
   v8::MaybeLocal<v8::Value> MakeCallback(
       const char* method,
       int argc,
       v8::Local<v8::Value>* argv);
 
   v8::MaybeLocal<v8::Value> MakeCallback(
       v8::Local<v8::String> symbol,
       int argc,
       v8::Local<v8::Value>* argv);
 
   v8::Local<v8::Object> get_resource();
   async_id get_async_id() const;
   async_id get_trigger_async_id() const;
 
  protected:
   class NODE_EXTERN CallbackScope : public node::CallbackScope {
    public:
     explicit CallbackScope(AsyncResource* res);
   };
 
  private:
   Environment* env_;
   v8::Global<v8::Object> resource_;
   async_context async_context_;
 };
 
 #ifndef _WIN32
 // Register a signal handler without interrupting any handlers that node
 // itself needs. This does override handlers registered through
 // process.on('SIG...', function() { ... }). The `reset_handler` flag indicates
 // whether the signal handler for the given signal should be reset to its
 // default value before executing the handler (i.e. it works like SA_RESETHAND).
 // The `reset_handler` flag is invalid when `signal` is SIGSEGV.
 NODE_EXTERN
 void RegisterSignalHandler(int signal,
                            void (*handler)(int signal,
                                            siginfo_t* info,
                                            void* ucontext),
                            bool reset_handler = false);
 #endif  // _WIN32
 
 // Configure the layout of the JavaScript object with a cppgc::GarbageCollected
 // instance so that when the JavaScript object is reachable, the garbage
 // collected instance would have its Trace() method invoked per the cppgc
 // contract. To make it work, the process must have called
 // cppgc::InitializeProcess() before, which is usually the case for addons
 // loaded by the stand-alone Node.js executable. Embedders of Node.js can use
 // either need to call it themselves or make sure that
 // ProcessInitializationFlags::kNoInitializeCppgc is *not* set for cppgc to
 // work.
 // If the CppHeap is owned by Node.js, which is usually the case for addon,
 // the object must be created with at least two internal fields available,
 // and the first two internal fields would be configured by Node.js.
 // This may be superseded by a V8 API in the future, see
 // https://bugs.chromium.org/p/v8/issues/detail?id=13960. Until then this
 // serves as a helper for Node.js isolates.
 NODE_EXTERN void SetCppgcReference(v8::Isolate* isolate,
                                    v8::Local<v8::Object> object,
                                    void* wrappable);
 
 }  // namespace node
 
 #endif  // SRC_NODE_H_

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