impl ToNapiValue for Result<T>

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

@@ -12,11 +12,12 @@ Generated by [AVA](https://avajs.dev).
     export function getNums(): Array<number>␊
     export function sumNums(nums: Array<number>): number␊
     export function getCwd(callback: (arg0: string) => void): void␊
-    export function readFile(callback: (arg0: Error | null, arg1: string | undefined) => void): void␊
+    export function readFile(callback: (arg0: Error | undefined, arg1: string | null) => void): void␊
     export enum Kind { Dog = 0, Cat = 1, Duck = 2 }␊
     export enum CustomNumEnum { One = 1, Two = 2, Three = 3, Four = 4, Six = 6, Eight = 8, Nine = 9, Ten = 10 }␊
     export function enumToI32(e: CustomNumEnum): number␊
-    export function mapOption(val: number | undefined): number | undefined␊
+    export function getError(): Error | undefined␊
+    export function mapOption(val: number | null): number | null␊
     export function add(a: number, b: number): number␊
     export function fibonacci(n: number): number␊
     export function listObjKeys(obj: object): Array<string>␊

examples/napi/__test__/values.spec.ts

@@ -19,6 +19,7 @@ import {
   createObj,
   mapOption,
   readFile,
+  getError,
 } from '../'
 
 test('number', (t) => {
@@ -81,7 +82,7 @@ test('callback', (t) => {
   )
 
   readFile((err, content) => {
-    t.is(err, null)
+    t.is(err, undefined)
     t.is(content, 'hello world')
   })
 })
@@ -92,6 +93,12 @@ test('object', (t) => {
 })
 
 test('Option', (t) => {
-  t.is(mapOption(undefined), undefined)
+  t.is(mapOption(null), null)
   t.is(mapOption(3), 4)
 })
+
+test('Result', (t) => {
+  const error = getError()
+  t.not(error, undefined)
+  t.is(error!.message, 'Manual Error')
+})

examples/napi/index.d.ts

@@ -2,11 +2,12 @@ export function getWords(): Array<string>
 export function getNums(): Array<number>
 export function sumNums(nums: Array<number>): number
 export function getCwd(callback: (arg0: string) => void): void
-export function readFile(callback: (arg0: Error | null, arg1: string | undefined) => void): void
+export function readFile(callback: (arg0: Error | undefined, arg1: string | null) => void): void
 export enum Kind { Dog = 0, Cat = 1, Duck = 2 }
 export enum CustomNumEnum { One = 1, Two = 2, Three = 3, Four = 4, Six = 6, Eight = 8, Nine = 9, Ten = 10 }
 export function enumToI32(e: CustomNumEnum): number
-export function mapOption(val: number | undefined): number | undefined
+export function getError(): Error | undefined
+export function mapOption(val: number | null): number | null
 export function add(a: number, b: number): number
 export function fibonacci(n: number): number
 export function listObjKeys(obj: object): Array<string>

examples/napi/src/error.rs

@@ -0,0 +1,6 @@
+use napi::bindgen_prelude::*;
+
+#[napi]
+fn get_error() -> Result<()> {
+  Err(Error::new(Status::InvalidArg, "Manual Error".to_owned()))
+}

examples/napi/src/lib.rs

@@ -5,6 +5,7 @@ mod array;
 mod callback;
 mod class;
 mod r#enum;
+mod error;
 mod nullable;
 mod number;
 mod object;