napi_async_init

napi_status napi_async_init(napi_env env,
                            napi_value async_resource,
                            napi_value async_resource_name,
                            napi_async_context* result) 拷贝

• [in] env：调用该 API 时所处的环境。
• [in] async_resource：与异步工作相关的对象，它将传递给可能的 async_hooks init 钩子，并且可以通过 async_hooks.executionAsyncResource() 访问。
• [in] async_resource_name：用于标识通过 async_hooks API 提供的诊断信息的资源类型。
• [out] result：初始化的异步上下文。

如果 API 成功，则返回 napi_ok。

【Returns napi_ok if the API succeeded.】

async_resource 对象需要保持存活直到 napi_async_destroy，以确保 async_hooks 相关的 API 正常工作。为了与之前版本保持 ABI 兼容，napi_async_context 并不会对 async_resource 对象保持强引用，以避免引入可能的内存泄漏。然而，如果在 napi_async_context 被 napi_async_destroy 销毁之前，async_resource 被 JavaScript 引擎回收，调用 napi_async_context 相关的 API（例如 napi_open_callback_scope 和 napi_make_callback）可能会导致使用 AsyncLocalStorage API 时异步上下文丢失等问题。

【The async_resource object needs to be kept alive until napi_async_destroy to keep async_hooks related API acts correctly. In order to retain ABI compatibility with previous versions, napi_async_contexts are not maintaining the strong reference to the async_resource objects to avoid introducing causing memory leaks. However, if the async_resource is garbage collected by JavaScript engine before the napi_async_context was destroyed by napi_async_destroy, calling napi_async_context related APIs like napi_open_callback_scope and napi_make_callback can cause problems like loss of async context when using the AsyncLocalStorage API.】

为了保持与以前版本的 ABI 兼容性，传递 NULL 给 async_resource 并不会导致错误。然而，这不推荐使用，因为这会导致与 async_hooks init 钩子 和 async_hooks.executionAsyncResource() 的行为不符合预期，因为底层的 async_hooks 实现现在需要该资源以提供异步回调之间的关联。

【In order to retain ABI compatibility with previous versions, passing NULL for async_resource does not result in an error. However, this is not recommended as this will result in undesirable behavior with async_hooks init hooks and async_hooks.executionAsyncResource() as the resource is now required by the underlying async_hooks implementation in order to provide the linkage between async callbacks.】