feat(napi-derive): support return_if_invalid

crates/backend/src/ast.rs

@@ -15,6 +15,7 @@ pub struct NapiFn {
   pub vis: syn::Visibility,
   pub parent: Option<Ident>,
   pub strict: bool,
+  pub return_if_invalid: bool,
   pub js_mod: Option<String>,
   pub ts_generic_types: Option<String>,
   pub ts_args_type: Option<String>,

crates/backend/src/codegen/fn.rs

@@ -188,7 +188,17 @@ impl NapiFn {
         }
       }
       _ => {
-        let type_check = if self.strict {
+        let type_check = if self.return_if_invalid {
+          quote! {
+            if let Ok(maybe_promise) = <#ty as napi::bindgen_prelude::ValidateNapiValue>::validate(env, cb.get_arg(#index)) {
+              if !maybe_promise.is_null() {
+                return Ok(maybe_promise);
+              }
+            } else {
+              return Ok(std::ptr::null_mut());
+            }
+          }
+        } else if self.strict {
           quote! {
             let maybe_promise = <#ty as napi::bindgen_prelude::ValidateNapiValue>::validate(env, cb.get_arg(#index))?;
             if !maybe_promise.is_null() {

crates/macro/src/parser/attrs.rs

@@ -50,6 +50,7 @@ macro_rules! attrgen {
       (readonly, Readonly(Span)),
       (skip, Skip(Span)),
       (strict, Strict(Span)),
+      (return_if_invalid, ReturnIfInvalid(Span)),
       (object, Object(Span)),
       (namespace, Namespace(Span, String, Span)),
       (iterator, Iterator(Span)),

crates/macro/src/parser/mod.rs

@@ -670,6 +670,7 @@ fn napi_fn_from_decl(
       comments: extract_doc_comments(&attrs),
       attrs,
       strict: opts.strict().is_some(),
+      return_if_invalid: opts.return_if_invalid().is_some(),
       js_mod: opts.namespace().map(|(m, _)| m.to_owned()),
       ts_generic_types: opts.ts_generic_types().map(|(m, _)| m.to_owned()),
       ts_args_type: opts.ts_args_type().map(|(m, _)| m.to_owned()),

examples/napi/__test__/strict.spec.ts

@@ -17,6 +17,8 @@ import {
   validateSymbol,
   validateNull,
   validateUndefined,
+  returnUndefinedIfInvalid,
+  returnUndefinedIfInvalidPromise,
 } from '../index'
 
 test('should validate array', (t) => {
@@ -166,3 +168,15 @@ test('should validate undefined', (t) => {
     message: 'Expect value to be Undefined, but received Number',
   })
 })
+
+test('should return undefined if arg is invalid', (t) => {
+  t.is(returnUndefinedIfInvalid(true), false)
+  // @ts-expect-error
+  t.is(returnUndefinedIfInvalid(1), undefined)
+})
+
+test('should return Promise.reject() if arg is not Promise', async (t) => {
+  t.is(await returnUndefinedIfInvalidPromise(Promise.resolve(true)), false)
+  // @ts-expect-error
+  await t.throwsAsync(() => returnUndefinedIfInvalidPromise(1))
+})

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

@@ -110,6 +110,8 @@ Generated by [AVA](https://avajs.dev).
     export function validatePromise(p: Promise<number>): Promise<number>␊
     export function validateString(s: string): string␊
     export function validateSymbol(s: symbol): boolean␊
+    export function returnUndefinedIfInvalid(input: boolean): boolean␊
+    export function returnUndefinedIfInvalidPromise(input: Promise<boolean>): Promise<boolean>␊
     export function tsRename(a: { foo: number }): string[]␊
     export function overrideIndividualArgOnFunction(notOverridden: string, f: () => string, notOverridden2: number): string␊
     export function overrideIndividualArgOnFunctionWithCbArg(callback: (town: string, name?: string | undefined | null) => string, notOverridden: number): object␊

examples/napi/index.d.ts

@@ -100,6 +100,8 @@ export function validateNumber(i: number): number
 export function validatePromise(p: Promise<number>): Promise<number>
 export function validateString(s: string): string
 export function validateSymbol(s: symbol): boolean
+export function returnUndefinedIfInvalid(input: boolean): boolean
+export function returnUndefinedIfInvalidPromise(input: Promise<boolean>): Promise<boolean>
 export function tsRename(a: { foo: number }): string[]
 export function overrideIndividualArgOnFunction(notOverridden: string, f: () => string, notOverridden2: number): string
 export function overrideIndividualArgOnFunctionWithCbArg(callback: (town: string, name?: string | undefined | null) => string, notOverridden: number): object

examples/napi/src/fn_strict.rs

@@ -87,3 +87,14 @@ fn validate_string(s: String) -> String {
 fn validate_symbol(_s: JsSymbol) -> bool {
   true
 }
+
+#[napi(return_if_invalid)]
+fn return_undefined_if_invalid(input: bool) -> bool {
+  !input
+}
+
+#[napi(return_if_invalid)]
+async fn return_undefined_if_invalid_promise(input: Promise<bool>) -> Result<bool> {
+  let input_value = input.await?;
+  Ok(!input_value)
+}