Fix return type for unknown input (#105)

sindresorhus · Jan 4, 2025 · 64ce883 · 64ce883
1 parent e593d37
commit 64ce883
Show file tree

Hide file tree

Showing 3 changed files with 11 additions and 7 deletions.
diff --git a/index.d.ts b/index.d.ts
@@ -107,7 +107,9 @@ serializeError(error);
 */
 export function serializeError<ErrorType>(error: ErrorType, options?: Options): ErrorType extends Primitive
 	? ErrorType
-	: ErrorObject;
+	: unknown extends ErrorType
+		? unknown
+		: ErrorObject;
 
 /**
 Deserialize a plain object or any value into an `Error` object.

diff --git a/index.test-d.ts b/index.test-d.ts
@@ -1,4 +1,4 @@
-import {expectType, expectAssignable} from 'tsd';
+import {expectTypeOf} from 'expect-type';
 import {
 	serializeError,
 	deserializeError,
@@ -9,16 +9,17 @@ import {
 
 const error = new Error('unicorn');
 
-expectType<number>(serializeError(1));
-expectType<ErrorObject>(serializeError(error));
-expectAssignable<Options>({maxDepth: 1});
+expectTypeOf(serializeError(1)).toEqualTypeOf<number>();
+expectTypeOf(serializeError(error as unknown)).toEqualTypeOf<unknown>();
+expectTypeOf(serializeError(error)).toEqualTypeOf<ErrorObject>();
+expectTypeOf({maxDepth: 1}).toMatchTypeOf<Options>();
 
-expectType<Error>(deserializeError({
+expectTypeOf(deserializeError({
 	message: 'error message',
 	stack: 'at <anonymous>:1:13',
 	name: 'name',
 	code: 'code',
-}));
+})).toEqualTypeOf<Error>();
 
 addKnownErrorConstructor(Error);
 

diff --git a/package.json b/package.json
@@ -41,6 +41,7 @@
 	},
 	"devDependencies": {
 		"ava": "^6.2.0",
+		"expect-type": "^1.1.0",
 		"tsd": "^0.31.2",
 		"xo": "^0.60.0"
 	}