feat: support async fn

Author: Akimotorakiyu

Cargo.toml

@@ -10,7 +10,7 @@ version = "0.1.0"
 crate-type = ["cdylib"]
 
 [dependencies]
-napi = "3.0.0"
+napi = { version = "3", features = ["async"] }
 napi-derive = "3.0.0"
 
 [build-dependencies]

__test__/index.spec.ts

@@ -1,8 +1,9 @@
 import test from 'ava'
 
-import { plus100 } from '../index.js'
+import { plus100, plus100Async } from '../index.js'
 
-test('sync function from native code', (t) => {
+test('sync function from native code', async (t) => {
   const fixture = 42
   t.is(plus100(fixture), fixture + 100)
+  t.is(await plus100Async(fixture), fixture + 100)
 })

index.d.ts

@@ -1,3 +1,5 @@
 /* auto-generated by NAPI-RS */
 /* eslint-disable */
 export declare function plus100(input: number): number
+
+export declare function plus100Async(input: number): Promise<number>

index.js

@@ -394,3 +394,4 @@ if (!nativeBinding) {
 
 module.exports = nativeBinding
 module.exports.plus100 = nativeBinding.plus100
+module.exports.plus100Async = nativeBinding.plus100Async

package-template.wasi-browser.js

@@ -57,3 +57,4 @@ const {
 })
 export default __napiModule.exports
 export const plus100 = __napiModule.exports.plus100
+export const plus100Async = __napiModule.exports.plus100Async

package-template.wasi.cjs

@@ -109,3 +109,4 @@ const { instance: __napiInstance, module: __wasiModule, napiModule: __napiModule
 })
 module.exports = __napiModule.exports
 module.exports.plus100 = __napiModule.exports.plus100
+module.exports.plus100Async = __napiModule.exports.plus100Async

simple-test.js

@@ -1,5 +1,11 @@
 const { plus100 } = require('./index')
 
-console.assert(plus100(0) === 100, 'Simple test failed')
+async function test() {
+    console.assert(plus100(0) === 100, 'Simple test failed')
 
-console.info('Simple test passed')
+    console.assert(await plus100Async(0), 'Simple test failed')
+
+    console.info('Simple test passed')
+}
+
+test()

src/lib.rs

@@ -6,3 +6,8 @@ use napi_derive::napi;
 pub fn plus_100(input: u32) -> u32 {
   input + 100
 }
+
+#[napi]
+pub async fn plus_100_async(input: u32) -> u32 {
+  input + 100
+}