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node_modules/node-addon-api/doc/env.md

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+# Env
+
+The opaque data structure containing the environment in which the request is being run.
+
+The Env object is usually created and passed by the Node.js runtime or node-addon-api infrastructure.
+
+## Methods
+
+### Constructor
+
+```cpp
+Napi::Env::Env(napi_env env);
+```
+
+- `[in] env`: The `napi_env` environment from which to construct the `Napi::Env` object.
+
+### napi_env
+
+```cpp
+operator napi_env() const;
+```
+
+Returns the `napi_env` opaque data structure representing the environment.
+
+### Global
+
+```cpp
+Napi::Object Napi::Env::Global() const;
+```
+
+Returns the `Napi::Object` representing the environment's JavaScript Global Object.
+
+### Undefined
+
+```cpp
+Napi::Value Napi::Env::Undefined() const;
+```
+
+Returns the `Napi::Value` representing the environment's JavaScript Undefined Object.
+
+### Null
+
+```cpp
+Napi::Value Napi::Env::Null() const;
+```
+
+Returns the `Napi::Value` representing the environment's JavaScript Null Object.
+
+### IsExceptionPending
+
+```cpp
+bool Napi::Env::IsExceptionPending() const;
+```
+
+Returns a `bool` indicating if an exception is pending in the environment.
+
+### GetAndClearPendingException
+
+```cpp
+Napi::Error Napi::Env::GetAndClearPendingException();
+```
+
+Returns an `Napi::Error` object representing the environment's pending exception, if any.
+
+### RunScript
+
+```cpp
+Napi::Value Napi::Env::RunScript(____ script);
+```
+- `[in] script`: A string containing JavaScript code to execute.
+
+Runs JavaScript code contained in a string and returns its result.
+
+The `script` can be any of the following types:
+- [`Napi::String`](string.md)
+- `const char *`
+- `const std::string &`
+
+### GetInstanceData
+```cpp
+template <typename T> T* GetInstanceData();
+```
+
+Returns the instance data that was previously associated with the environment,
+or `nullptr` if none was associated.
+
+### SetInstanceData
+
+```cpp
+template <typename T> using Finalizer = void (*)(Env, T*);
+template <typename T, Finalizer<T> fini = Env::DefaultFini<T>>
+void SetInstanceData(T* data);
+```
+
+- `[template] fini`: A function to call when the instance data is to be deleted.
+Accepts a function of the form `void CleanupData(Napi::Env env, T* data)`. If
+not given, the default finalizer will be used, which simply uses the `delete`
+operator to destroy `T*` when the addon instance is unloaded.
+- `[in] data`: A pointer to data that will be associated with the instance of
+the addon for the duration of its lifecycle.
+
+Associates a data item stored at `T* data` with the current instance of the
+addon. The item will be passed to the function `fini` which gets called when an
+instance of the addon is unloaded.
+
+### SetInstanceData
+
+```cpp
+template <typename DataType, typename HintType>
+using FinalizerWithHint = void (*)(Env, DataType*, HintType*);
+template <typename DataType,
+          typename HintType,
+          FinalizerWithHint<DataType, HintType> fini =
+            Env::DefaultFiniWithHint<DataType, HintType>>
+void SetInstanceData(DataType* data, HintType* hint);
+```
+
+- `[template] fini`: A function to call when the instance data is to be deleted.
+Accepts a function of the form
+`void CleanupData(Napi::Env env, DataType* data, HintType* hint)`. If not given,
+the default finalizer will be used, which simply uses the `delete` operator to
+destroy `T*` when the addon instance is unloaded.
+- `[in] data`: A pointer to data that will be associated with the instance of
+the addon for the duration of its lifecycle.
+- `[in] hint`: A pointer to data that will be associated with the instance of
+the addon for the duration of its lifecycle and will be passed as a hint to
+`fini` when the addon instance is unloaded.
+
+Associates a data item stored at `T* data` with the current instance of the
+addon. The item will be passed to the function `fini` which gets called when an
+instance of the addon is unloaded. This overload accepts an additional hint to
+be passed to `fini`.