node-addon-api
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Package description
The node-addon-api package is a helper library for building Node.js Addons in C++. It provides a C++ API that abstracts away the complexities of working with the low-level V8 and N-API provided by Node.js, making it easier to develop native addons.
Object Wrapping
Object wrapping allows C++ classes to be represented as JavaScript objects. It provides an easy way to create and manage objects that have a one-to-one relationship with C++ objects.
Napi::ObjectReference MyClass::constructor;
MyClass::MyClass(const Napi::CallbackInfo& info) : Napi::ObjectWrap<MyClass>(info) {
// constructor implementation
}
Napi::Object MyClass::Init(Napi::Env env, Napi::Object exports) {
Napi::HandleScope scope(env);
Napi::Function func = DefineClass(env, "MyClass", {
InstanceMethod("myMethod", &MyClass::MyMethod)
});
constructor = Napi::Persistent(func);
constructor.SuppressDestruct();
exports.Set("MyClass", func);
return exports;
}Function Arguments
The package provides a way to handle function arguments passed from JavaScript to C++ with type checking and conversion utilities.
Napi::Value MyFunction(const Napi::CallbackInfo& info) {
Napi::Env env = info.Env();
if (info.Length() < 2) {
Napi::TypeError::New(env, "Expected at least two arguments").ThrowAsJavaScriptException();
}
Napi::String arg0 = info[0].As<Napi::String>();
double arg1 = info[1].As<Napi::Number>().DoubleValue();
// function implementation
return Napi::String::New(env, "result");
}Asynchronous Operations
node-addon-api provides utilities for performing asynchronous operations, allowing long-running tasks to be executed without blocking the Node.js event loop.
class MyAsyncWorker : public Napi::AsyncWorker {
public:
MyAsyncWorker(Napi::Function& callback) : AsyncWorker(callback) {}
void Execute() override {
// Do work in another thread
}
void OnOK() override {
Napi::HandleScope scope(Env());
Callback().Call({Env().Null(), Napi::String::New(Env(), "Success")});
}
};
Napi::Value RunAsyncWork(const Napi::CallbackInfo& info) {
Napi::Function callback = info[0].As<Napi::Function>();
MyAsyncWorker* worker = new MyAsyncWorker(callback);
worker->Queue();
return info.Env().Undefined();
}The 'nan' package is a header file filled with macros and utilities for making addon development for different versions of V8 easier. It predates N-API and node-addon-api, and while it's still used, node-addon-api is recommended for most cases due to its simpler API and direct support for N-API.
The 'ffi-napi' package allows for calling foreign functions of dynamic libraries from Node.js. It is similar to node-addon-api in that it allows for native functionality in Node.js, but it focuses on interfacing with existing libraries rather than writing new native modules.
The 'neon' package is a Rust framework for writing safe and fast native Node.js modules. Like node-addon-api, it simplifies the process of writing native addons but does so using Rust instead of C++.
Changelog
2018-05-08 Version 1.3.0, @mhdawson
Readme
This package contains header-only C++ wrapper classes for the ABI-stable Node.js API also known as N-API, providing C++ object model and exception handling semantics with low overhead. It guarantees backward compatibility when used with older versions of Node.js that do not have N-API built-in.
N-API is an API for building native addons. It is independent from the underlying JavaScript runtime (e.g. V8 or ChakraCore) and is maintained as part of Node.js itself. This API will be Application Binary Interface (ABI) stable across versions and flavors of Node.js. It is intended to insulate native addons from changes in the underlying JavaScript engine and allow modules compiled for one version to run on later versions of Node.js without recompilation. N-API guarantees the API and ABI compatibility across different versions of Node.js. So if you switched to a different version of Node.js, you would not need to reinstall or recompile the native addon.
APIs exposed by N-API are generally used to create and manipulate JavaScript values. Concepts and operations generally map to ideas specified in the ECMA262 Language Specification.
(See CHANGELOG.md for complete Changelog)
Are you new to N-API? Take a look at our examples
To run the N-API tests do:
npm install
npm test
Take a look and get inspired by our test suite
| Name | GitHub link |
|---|---|
| Anna Henningsen | addaleax |
| Arunesh Chandra | aruneshchandra |
| Benjamin Byholm | kkoopa |
| Gabriel Schulhof | gabrielschulhof |
| Hitesh Kanwathirtha | digitalinfinity |
| Jason Ginchereau | jasongin |
| Michael Dawson | mhdawson |
| Nicola Del Gobbo | NickNaso |
| Sampson Gao | sampsongao |
| Taylor Woll | boingoing |
Licensed under MIT
FAQs
Node.js API (Node-API)
The npm package node-addon-api receives a total of 14,808,586 weekly downloads. As such, node-addon-api popularity was classified as popular.
We found that node-addon-api demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 7 open source maintainers collaborating on the project.
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