[types] use a generic

ljharb · Mar 9, 2024 · a1d744d · a1d744d
1 parent 3d3da0a
commit a1d744d
Show file tree

Hide file tree

Showing 2 changed files with 4 additions and 3 deletions.
diff --git a/index.d.ts b/index.d.ts
@@ -1,3 +1,3 @@
-declare function safeArrayConcat(item: unknown | unknown[], ...items: unknown[]): unknown[];
+declare function safeArrayConcat<T = unknown>(item: T | T[], ...items: (T | T[])[]): T[];
 
-export = safeArrayConcat;
+export = safeArrayConcat;
diff --git a/test/index.js b/test/index.js
@@ -19,7 +19,8 @@ test('safe-array-concat', function (t) {
 	);
 
 	t.deepEqual(
-		safeConcat([1, 2], [3, 4], 'foo', 5, 6, [[7]]),
+		// eslint-disable-next-line no-extra-parens
+		safeConcat(/** @type {(string | number | number[])[]} */ ([1, 2]), [3, 4], 'foo', 5, 6, [[7]]),
 		[1, 2, 3, 4, 'foo', 5, 6, [7]],
 		'works with flat and nested arrays'
 	);