From 688060845275468b21be03efe46e2a7e5cd71afa Mon Sep 17 00:00:00 2001
From: Kenta Moriuchi <moriken@kimamass.com>
Date: Sat, 25 Jan 2025 01:25:55 +0900
Subject: [PATCH] fix(types): `Deno.readDirSync`'s type returns an
 `IteratorObject` (#27805)

---
 cli/tsc/dts/lib.deno.ns.d.ts | 2 +-
 tests/unit/read_dir_test.ts  | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/cli/tsc/dts/lib.deno.ns.d.ts b/cli/tsc/dts/lib.deno.ns.d.ts
index e98f68ea38..7bfc3bb97b 100644
--- a/cli/tsc/dts/lib.deno.ns.d.ts
+++ b/cli/tsc/dts/lib.deno.ns.d.ts
@@ -3124,7 +3124,7 @@ declare namespace Deno {
    * @tags allow-read
    * @category File System
    */
-  export function readDirSync(path: string | URL): Iterable<DirEntry>;
+  export function readDirSync(path: string | URL): IteratorObject<DirEntry>;
 
   /** Copies the contents and permissions of one file to another specified path,
    * by default creating a new file if needed, else overwriting. Fails if target
diff --git a/tests/unit/read_dir_test.ts b/tests/unit/read_dir_test.ts
index 9c5e6da79f..15dd59fcf0 100644
--- a/tests/unit/read_dir_test.ts
+++ b/tests/unit/read_dir_test.ts
@@ -25,6 +25,14 @@ Deno.test({ permissions: { read: true } }, function readDirSyncSuccess() {
   assertSameContent(files);
 });
 
+Deno.test(
+  { permissions: { read: true } },
+  function readDirSyncResultHasIteratorHelperMethods() {
+    const iterator = Deno.readDirSync("tests/testdata");
+    assertEquals(typeof iterator.map, "function");
+  },
+);
+
 Deno.test({ permissions: { read: true } }, function readDirSyncWithUrl() {
   const files = [
     ...Deno.readDirSync(pathToAbsoluteFileUrl("tests/testdata")),