# napi-rs
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> This project was initialized from [xray](https://github.com/atom/xray)
A minimal library for building compiled `Node.js` add-ons in `Rust`.
<p>
<a href="https://docs.rs/crate/napi"><img src="https://docs.rs/napi/badge.svg"></img></a>
<a href="https://crates.io/crates/napi"><img src="https://img.shields.io/crates/v/napi.svg"></img></a>
<a href="https://www.npmjs.com/package/@napi-rs/cli"><img src="https://img.shields.io/npm/v/@napi-rs/cli.svg"></img></a>
</p>
## Ecosystem
<p align="center">
<a href="https://www.prisma.io/" target="_blank">
<img alt="Prisma" src="https://raw.githubusercontent.com/napi-rs/napi-rs/main/images/prisma.svg" height="50px">
</a>
<a href="https://swc.rs/" target="_blank">
<img alt="swc" src="https://raw.githubusercontent.com/swc-project/logo/master/swc.png" height="50px">
</a>
<a href="https://parceljs.org/" target="_blank">
<img alt="Parcel" src="https://user-images.githubusercontent.com/19409/31321658-f6aed0f2-ac3d-11e7-8100-1587e676e0ec.png" height="50px">
</a>
<a href="https://nextjs.org/">
<img alt="next.js" src="https://assets.vercel.com/image/upload/v1607554385/repositories/next-js/next-logo.png" height="50px">
<img alt="nextjs.svg" src="https://raw.githubusercontent.com/napi-rs/napi-rs/main/images/nextjs.svg" height="50px">
</a>
</p>
## Platform Support
[](https://github.com/napi-rs/napi-rs/actions/workflows/windows-arm.yml)
[](https://cirrus-ci.com/github/napi-rs/napi-rs?branch=main)
| Windows x64 | ✓ | ✓ | ✓ |
| Windows x86 | ✓ | ✓ | ✓ |
| Windows arm64 | ✓ | ✓ | ✓ |
| macOS x64 | ✓ | ✓ | ✓ |
| macOS aarch64 | ✓ | ✓ | ✓ |
| Linux x64 gnu | ✓ | ✓ | ✓ |
| Linux x64 musl | ✓ | ✓ | ✓ |
| Linux aarch64 gnu | ✓ | ✓ | ✓ |
| Linux aarch64 musl | ✓ | ✓ | ✓ |
| Linux arm gnueabihf | ✓ | ✓ | ✓ |
| Linux aarch64 android | ✓ | ✓ | ✓ |
| FreeBSD x64 | ✓ | ✓ | ✓ |
This library depends on Node-API and requires `Node@10.0.0` or later.
We already have some packages written by `napi-rs`: [node-rs](https://github.com/napi-rs/node-rs)
One nice feature is that this crate allows you to build add-ons purely with the `Rust/JavaScript` toolchain and without involving `node-gyp`.
## Taste
> You can start from [package-template](https://github.com/napi-rs/package-template) to play with `napi-rs`
### Define JavaScript functions
```rust
#[js_function(1)] // ------> arguments length
fn fibonacci(ctx: CallContext) -> Result<JsNumber> {
let n = ctx.get::<JsNumber>(0)?.try_into()?;
ctx.env.create_int64(fibonacci_native(n))
}
#[inline(always)]
fn fibonacci_native(n: i64) -> i64 {
match n {
1 | 2 => 1,
_ => fibonacci_native(n - 1) + fibonacci_native(n - 2),
}
}
```
### Register module
```rust
#[macro_use]
extern crate napi_derive;
use napi::{JsObject, Result};
/// `exports` is `module.exports` object in NodeJS
#[module_exports]
fn init(mut exports: JsObject) -> Result<()> {
exports.create_named_method("fibonacci", fibonacci)?;
Ok(())
}
```
And you can also create `JavaScript` value while registering module:
```rust
#[macro_use]
extern crate napi_derive;
use napi::{JsObject, Result, Env};
#[module_exports]
fn init(mut exports: JsObject, env: Env) -> Result<()> {
exports.create_named_method("fibonacci", fibonacci)?;
exports.set_named_property("DEFAULT_VALUE", env.create_int64(100)?)?;
Ok(())
}
```
## Building
This repository is a `Cargo` crate. Any napi-based add-on should contain `Cargo.toml` to make it a Cargo crate.
In your `Cargo.toml` you need to set the `crate-type` to `"cdylib"` so that cargo builds a C-style shared library that can be dynamically loaded by the Node executable. You'll also need to add this crate as a dependency.
```toml
[package]
name = "awesome"
[lib]
crate-type = ["cdylib"]
[dependencies]
napi = "1"
napi-derive = "1"
[build-dependencies]
napi-build = "1"
```
And create `build.rs` in your own project:
```rust
// build.rs
extern crate napi_build;
fn main() {
napi_build::setup();
}
```
So far, the `napi` build script has only been tested on `macOS` `Linux` `Windows x64 MSVC` and `FreeBSD`.
See the included [test_module](./test_module) for an example add-on.
Install the `@napi-rs/cli` to help you build your `Rust` codes and copy `Dynamic lib` file to `.node` file in case you can `require` it in your program.
```js
{
"package": "awesome-package",
"devDependencies": {
"@napi-rs/cli": "^1.0.0"
},
"napi": {
"name": "jarvis" // <----------- Config the name of native addon, or the napi command will use the name of `Cargo.toml` for the binary file name.
},
"scripts": {
"build": "napi build --release",
"build:debug": "napi build"
}
}
```
Then you can require your native binding:
```js
require('./jarvis.node')
```
The `module_name` would be your `package` name in your `Cargo.toml`.
`xxx => ./xxx.node`
`xxx-yyy => ./xxx_yyy.node`
You can also copy `Dynamic lib` file to an appointed location:
```bash
napi build [--release] ./dll
napi build [--release] ./artifacts
```
There are [documents](./cli) which contains more details about the `@napi-rs/cli` usage.
## Testing
Because libraries that depend on this crate must be loaded into a Node executable in order to resolve symbols, all tests are written in JavaScript in the `test_module` subdirectory.
To run tests:
```sh
yarn build:test
yarn test
```
## Related projects
- [neon](https://www.neon-bindings.com)
- [node-bindgen](https://github.com/infinyon/node-bindgen)
## Features table
### Create JavaScript values
| [napi_create_array](https://nodejs.org/api/n-api.html#n_api_napi_create_array) | 1 | v8.0.0 | ✅ |
| [napi_create_array_with_length](https://nodejs.org/api/n-api.html#n_api_napi_create_array_with_length) | 1 | v8.0.0 | ✅ |
| [napi_create_arraybuffer](https://nodejs.org/api/n-api.html#n_api_napi_create_arraybuffer) | 1 | v8.0.0 | ✅ |
| [napi_create_buffer](https://nodejs.org/api/n-api.html#n_api_napi_create_buffer) | 1 | v8.0.0 | ✅ |
| [napi_create_buffer_copy](https://nodejs.org/api/n-api.html#n_api_napi_create_buffer_copy) | 1 | v8.0.0 | ✅ |
| [napi_create_date](https://nodejs.org/api/n-api.html#n_api_napi_create_date) | 5 | v11.11.0 | ✅ |
| [napi_create_external](https://nodejs.org/api/n-api.html#n_api_napi_create_external) | 1 | v8.0.0 | ✅ |
| [napi_create_external_arraybuffer](https://nodejs.org/api/n-api.html#n_api_napi_create_external_arraybuffer) | 1 | v8.0.0 | ✅ |
| [napi_create_external_buffer](https://nodejs.org/api/n-api.html#n_api_napi_create_external_buffer) | 1 | v8.0.0 | ✅ |
| [napi_create_object](https://nodejs.org/api/n-api.html#n_api_napi_create_object) | 1 | v8.0.0 | ✅ |
| [napi_create_symbol](https://nodejs.org/api/n-api.html#n_api_napi_create_symbol) | 1 | v8.0.0 | ✅ |
| [napi_create_typedarray](https://nodejs.org/api/n-api.html#n_api_napi_create_typedarray) | 1 | v8.0.0 | ✅ |
| [napi_create_dataview](https://nodejs.org/api/n-api.html#n_api_napi_create_dataview) | 1 | v8.3.0 | ✅ |
| [napi_create_int32](https://nodejs.org/api/n-api.html#n_api_napi_create_int32) | 1 | v8.4.0 | ✅ |
| [napi_create_uint32](https://nodejs.org/api/n-api.html#n_api_napi_create_uint32) | 1 | v8.4.0 | ✅ |
| [napi_create_int64](https://nodejs.org/api/n-api.html#n_api_napi_create_int64) | 1 | v8.4.0 | ✅ |
| [napi_create_double](https://nodejs.org/api/n-api.html#n_api_napi_create_double) | 1 | v8.4.0 | ✅ |
| [napi_create_bigint_int64](https://nodejs.org/api/n-api.html#n_api_napi_create_bigint_int64) | 6 | v10.7.0 | ✅ |
| [napi_create_bigint_uint64](https://nodejs.org/api/n-api.html#n_api_napi_create_bigint_uint64) | 6 | v10.7.0 | ✅ |
| [napi_create_bigint_words](https://nodejs.org/api/n-api.html#n_api_napi_create_bigint_words) | 6 | v10.7.0 | ✅ |
| [napi_create_string_latin1](https://nodejs.org/api/n-api.html#n_api_napi_create_string_latin1) | 1 | v8.0.0 | ✅ |
| [napi_create_string_utf16](https://nodejs.org/api/n-api.html#n_api_napi_create_string_utf16) | 1 | v8.0.0 | ✅ |
| [napi_create_string_utf8](https://nodejs.org/api/n-api.html#n_api_napi_create_string_utf8) | 1 | v8.0.0 | ✅ |
| [napi_type_tag](https://nodejs.org/api/n-api.html#n_api_napi_type_tag) | 8 | v14.8.0, v12.19.0 | ⚠️ |
> I have no plan to implement `nape_type_tag` and related API in `napi-rs`, because we have implemented a `rust` replacement in [TaggedObject](https://github.com/napi-rs/napi-rs/blob/main/napi/src/js_values/tagged_object.rs) which is more convenient and more compatible.
### [Functions to convert from Node-API to C types](https://nodejs.org/api/n-api.html#n_api_functions_to_convert_from_node_api_to_c_types)
| [napi_get_array_length](https://nodejs.org/api/n-api.html#n_api_napi_get_array_length) | 1 | v8.0.0 | ✅ |
| [napi_get_arraybuffer_info](https://nodejs.org/api/n-api.html#n_api_napi_get_arraybuffer_info) | 1 | v8.0.0 | ✅ |
| [napi_get_buffer_info](https://nodejs.org/api/n-api.html#n_api_napi_get_buffer_info) | 1 | v8.0.0 | ✅ |
| [napi_get_prototype](https://nodejs.org/api/n-api.html#n_api_napi_get_prototype) | 1 | v8.0.0 | ✅ |
| [napi_get_typedarray_info](https://nodejs.org/api/n-api.html#n_api_napi_get_typedarray_info) | 1 | v8.0.0 | ✅ |
| [napi_get_dataview_info](https://nodejs.org/api/n-api.html#n_api_napi_get_dataview_info) | 1 | v8.3.0 | ✅ |
| [napi_get_date_value](https://nodejs.org/api/n-api.html#n_api_napi_get_date_value) | 5 | v11.11.0 | ✅ |
| [napi_get_value_bool](https://nodejs.org/api/n-api.html#n_api_napi_get_value_bool) | 1 | v8.0.0 | ✅ |
| [napi_get_value_double](https://nodejs.org/api/n-api.html#n_api_napi_get_value_double) | 1 | v8.0.0 | ✅ |
| [napi_get_value_bigint_int64](https://nodejs.org/api/n-api.html#n_api_napi_get_value_bigint_int64) | 6 | v10.7.0 | ✅ |
| [napi_get_value_bigint_uint64](https://nodejs.org/api/n-api.html#n_api_napi_get_value_bigint_uint64) | 6 | v10.7.0 | ✅ |
| [napi_get_value_bigint_words](https://nodejs.org/api/n-api.html#n_api_napi_get_value_bigint_words) | 6 | v10.7.0 | ✅ |
| [napi_get_value_external](https://nodejs.org/api/n-api.html#n_api_napi_get_value_external) | 1 | v8.0.0 | ✅ |
| [napi_get_value_int32](https://nodejs.org/api/n-api.html#n_api_napi_get_value_int32) | 1 | v8.0.0 | ✅ |
| [napi_get_value_int64](https://nodejs.org/api/n-api.html#n_api_napi_get_value_int64) | 1 | v8.0.0 | ✅ |
| [napi_get_value_string_latin1](https://nodejs.org/api/n-api.html#n_api_napi_get_value_string_latin1) | 1 | v8.0.0 | ✅ |
| [napi_get_value_string_utf8](https://nodejs.org/api/n-api.html#n_api_napi_get_value_string_utf8) | 1 | v8.0.0 | ✅ |
| [napi_get_value_string_utf16](https://nodejs.org/api/n-api.html#n_api_napi_get_value_string_utf16) | 1 | v8.0.0 | ✅ |
| [napi_get_value_uint32](https://nodejs.org/api/n-api.html#n_api_napi_get_value_uint32) | 1 | v8.0.0 | ✅ |
| [napi_get_boolean](https://nodejs.org/api/n-api.html#n_api_napi_get_boolean) | 1 | v8.0.0 | ✅ |
| [napi_get_global](https://nodejs.org/api/n-api.html#n_api_napi_get_global) | 1 | v8.0.0 | ✅ |
| [napi_get_null](https://nodejs.org/api/n-api.html#n_api_napi_get_null) | 1 | v8.0.0 | ✅ |
| [napi_get_undefined](https://nodejs.org/api/n-api.html#n_api_napi_get_undefined) | 1 | v8.0.0 | ✅ |
### [Working with JavaScript Values and Abstract Operations](https://nodejs.org/api/n-api.html#n_api_working_with_javascript_values_and_abstract_operations)
| [napi_coerce_to_bool](https://nodejs.org/api/n-api.html#n_api_napi_coerce_to_bool) | 1 | v8.0.0 | ✅ |
| [napi_coerce_to_number](https://nodejs.org/api/n-api.html#n_api_napi_coerce_to_number) | 1 | v8.0.0 | ✅ |
| [napi_coerce_to_object](https://nodejs.org/api/n-api.html#n_api_napi_coerce_to_object) | 1 | v8.0.0 | ✅ |
| [napi_coerce_to_string](https://nodejs.org/api/n-api.html#n_api_napi_coerce_to_string) | 1 | v8.0.0 | ✅ |
| [napi_typeof](https://nodejs.org/api/n-api.html#n_api_napi_typeof) | 1 | v8.0.0 | ✅ |
| [napi_instanceof](https://nodejs.org/api/n-api.html#n_api_napi_instanceof) | 1 | v8.0.0 | ✅ |
| [napi_is_array](https://nodejs.org/api/n-api.html#n_api_napi_is_array) | 1 | v8.0.0 | ✅ |
| [napi_is_arraybuffer](https://nodejs.org/api/n-api.html#n_api_napi_is_arraybuffer) | 1 | v8.0.0 | ✅ |
| [napi_is_buffer](https://nodejs.org/api/n-api.html#n_api_napi_is_buffer) | 1 | v8.0.0 | ✅ |
| [napi_is_date](https://nodejs.org/api/n-api.html#n_api_napi_is_date) | 1 | v8.0.0 | ✅ |
| [napi_is_error](https://nodejs.org/api/n-api.html#n_api_napi_is_error_1) | 1 | v8.0.0 | ✅ |
| [napi_is_typedarray](https://nodejs.org/api/n-api.html#n_api_napi_is_typedarray) | 1 | v8.0.0 | ✅ |
| [napi_is_dataview](https://nodejs.org/api/n-api.html#n_api_napi_is_dataview) | 1 | v8.3.0 | ✅ |
| [napi_strict_equals](https://nodejs.org/api/n-api.html#n_api_napi_strict_equals) | 1 | v8.0.0 | ✅ |
| [napi_detach_arraybuffer](https://nodejs.org/api/n-api.html#n_api_napi_detach_arraybuffer) | 7 | v13.3.0 | ✅ |
| [napi_is_detached_arraybuffer](https://nodejs.org/api/n-api.html#n_api_napi_is_detached_arraybuffer) | 7 | v13.3.0 | ✅ |
| [napi_object_freeze](https://nodejs.org/api/n-api.html#n_api_napi_object_freeze) | 8 | v14.14.0, v12.20.0 | ✅ |
| [napi_object_seal](https://nodejs.org/api/n-api.html#n_api_napi_object_seal) | 8 | v14.14.0, v12.20.0 | ✅ |