feat(napi): support rust array to js array

crates/backend/src/typegen.rs

@@ -351,6 +351,10 @@ pub fn ty_to_ts_type(ty: &Type, is_return_ty: bool, is_struct_field: bool) -> (S
       ts_ty.unwrap_or_else(|| ("any".to_owned(), false))
     }
     Type::Group(g) => ty_to_ts_type(&g.elem, is_return_ty, is_struct_field),
+    Type::Array(a) => {
+      let (element_type, is_optional) = ty_to_ts_type(&a.elem, is_return_ty, is_struct_field);
+      (format!("{}[]", element_type), is_optional)
+    }
     _ => ("any".to_owned(), false),
   }
 }

crates/napi/src/bindgen_runtime/js_values/array.rs

@@ -177,6 +177,36 @@ impl<T> TypeName for Vec<T> {
   }
 }
 
+impl<T, const N: usize> ToNapiValue for [T; N]
+where
+  T: ToNapiValue + Copy,
+{
+  unsafe fn to_napi_value(env: sys::napi_env, val: Self) -> Result<sys::napi_value> {
+    let mut arr = Array::new(env, val.len() as u32)?;
+
+    for (i, v) in val.into_iter().enumerate() {
+      arr.set(i as u32, v)?;
+    }
+
+    unsafe { Array::to_napi_value(env, arr) }
+  }
+}
+
+impl<T> ToNapiValue for &[T]
+where
+  T: ToNapiValue + Copy,
+{
+  unsafe fn to_napi_value(env: sys::napi_env, val: Self) -> Result<sys::napi_value> {
+    let mut arr = Array::new(env, val.len() as u32)?;
+
+    for (i, v) in val.iter().enumerate() {
+      arr.set(i as u32, *v)?;
+    }
+
+    unsafe { Array::to_napi_value(env, arr) }
+  }
+}
+
 impl<T> ToNapiValue for Vec<T>
 where
   T: ToNapiValue,

examples/napi/__test__/typegen.spec.ts.md

@@ -26,6 +26,8 @@ Generated by [AVA](https://avajs.dev).
     export function getNums(): Array<number>␊
     export function sumNums(nums: Array<number>): number␊
     export function toJsObj(): object␊
+    export function getNumArr(): number[]␊
+    export function getNestedNumArr(): number[][][]␊
     export function readFileAsync(path: string): Promise<Buffer>␊
     export function asyncMultiTwo(arg: number): Promise<number>␊
     export function bigintAdd(a: bigint, b: bigint): bigint␊

examples/napi/__test__/values.spec.ts

@@ -105,6 +105,8 @@ import {
   AnotherClassForEither,
   receiveDifferentClass,
   useTokioWithoutAsync,
+  getNumArr,
+  getNestedNumArr,
 } from '../'
 
 test('export const', (t) => {
@@ -144,6 +146,8 @@ test('array', (t) => {
   t.deepEqual(getWords(), ['foo', 'bar'])
 
   t.is(sumNums([1, 2, 3, 4, 5]), 15)
+  t.deepEqual(getNumArr(), [1, 2])
+  t.deepEqual(getNestedNumArr(), [[[1]], [[1]]])
 })
 
 test('map', (t) => {

examples/napi/index.d.ts

@@ -16,6 +16,8 @@ export function getWords(): Array<string>
 export function getNums(): Array<number>
 export function sumNums(nums: Array<number>): number
 export function toJsObj(): object
+export function getNumArr(): number[]
+export function getNestedNumArr(): number[][][]
 export function readFileAsync(path: string): Promise<Buffer>
 export function asyncMultiTwo(arg: number): Promise<number>
 export function bigintAdd(a: bigint, b: bigint): bigint

examples/napi/src/array.rs

@@ -23,3 +23,13 @@ fn to_js_obj(env: Env) -> napi::Result<JsObject> {
   arr.insert(42)?;
   arr.coerce_to_object()
 }
+
+#[napi]
+fn get_num_arr() -> [u32; 2] {
+  [1, 2]
+}
+
+#[napi]
+fn get_nested_num_arr() -> [[[u32; 1]; 1]; 2] {
+  [[[1]], [[1]]]
+}