An experimental repo for Node.js native addons that written in Swift.
The first motivation of implementeing this was reduceing overhead of execution between Node.js and Swift on the Serverless environment.

1. Define function(s) in a format that can be exported to C/C++ in Swift side.

@_cdecl("swift_fibonacci") // Name the function symbol.
public func fibonacci(_ n: CInt) -> CInt {
    if n == 0 {
        return 0
    } else if n == 1{
        return 1
    }
    return fibonacci(n - 1) + fibonacci(n - 2)
}

2. Register fibonacci as callable function in Node.js (V8 side)

3. The exported functions can be imported and executed in Node.js side.

const swift = require('bindings')('swift');

const result = swift.fibonacci(10);
console.log(result);

$ docker build -t node-native-extension-in-swift .
$ docker run -t node-native-extension-in-swift

$ git clone https://github.com/noppoMan/node-native-extension-in-swift.git
$ cd node-native-extension-in-swift
$ swift build --package-path NativeExtensionInSwift
$ npm i
$ node index.js

node-native-extension-in-swift is released under the MIT license. See LICENSE for details.