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116 lines
3.0 KiB
Markdown
116 lines
3.0 KiB
Markdown
# Error
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The `Napi::Error` class is a representation of the JavaScript `Error` object that is thrown
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when runtime errors occur. The Error object can also be used as a base object for
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user-defined exceptions.
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The `Napi::Error` class is a persistent reference to a JavaScript error object thus
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inherits its behavior from the `Napi::ObjectReference` class (for more info see: [`Napi::ObjectReference`](object_reference.md)).
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If C++ exceptions are enabled (for more info see: [Setup](setup.md)), then the
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`Napi::Error` class extends `std::exception` and enables integrated
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error-handling for C++ exceptions and JavaScript exceptions.
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For more details about error handling refer to the section titled [Error handling](error_handling.md).
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## Methods
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### New
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Creates empty instance of an `Napi::Error` object for the specified environment.
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```cpp
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Napi::Error::New(Napi::Env env);
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```
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- `[in] env`: The environment in which to construct the `Napi::Error` object.
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Returns an instance of `Napi::Error` object.
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### New
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Creates instance of an `Napi::Error` object.
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```cpp
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Napi::Error::New(Napi::Env env, const char* message);
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```
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- `[in] env`: The environment in which to construct the `Napi::Error` object.
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- `[in] message`: Null-terminated string to be used as the message for the `Napi::Error`.
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Returns instance of an `Napi::Error` object.
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### New
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Creates instance of an `Napi::Error` object
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```cpp
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Napi::Error::New(Napi::Env env, const std::string& message);
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```
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- `[in] env`: The environment in which to construct the `Napi::Error` object.
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- `[in] message`: Reference string to be used as the message for the `Napi::Error`.
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Returns instance of an `Napi::Error` object.
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### Fatal
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In case of an unrecoverable error in a native module, a fatal error can be thrown
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to immediately terminate the process.
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```cpp
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static NAPI_NO_RETURN void Napi::Error::Fatal(const char* location, const char* message);
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```
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The function call does not return, the process will be terminated.
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### Constructor
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Creates empty instance of an `Napi::Error`.
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```cpp
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Napi::Error::Error();
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```
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Returns an instance of `Napi::Error` object.
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### Constructor
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Initializes an `Napi::Error` instance from an existing JavaScript error object.
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```cpp
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Napi::Error::Error(napi_env env, napi_value value);
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```
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- `[in] env`: The environment in which to construct the error object.
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- `[in] value`: The `Napi::Error` reference to wrap.
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Returns instance of an `Napi::Error` object.
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### Message
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```cpp
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std::string& Napi::Error::Message() const NAPI_NOEXCEPT;
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```
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Returns the reference to the string that represent the message of the error.
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### ThrowAsJavaScriptException
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Throw the error as JavaScript exception.
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```cpp
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void Napi::Error::ThrowAsJavaScriptException() const;
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```
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Throws the error as a JavaScript exception.
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### what
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```cpp
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const char* Napi::Error::what() const NAPI_NOEXCEPT override;
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```
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Returns a pointer to a null-terminated string that is used to identify the
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exception. This method can be used only if the exception mechanism is enabled.
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