From 515182a179d4439079b2b7f6927555ba5ab0b035 Mon Sep 17 00:00:00 2001
From: Sam Hinshaw <samuel.hinshaw@gmail.com>
Date: Sun, 17 Aug 2025 02:19:44 -0700
Subject: [PATCH] fix: Specify Generic for readFile ArrayBuffer (fix #2914)
 (#2915)

---
 .changes/fs-write-uint8array-arraybuffer.md | 6 ++++++
 plugins/fs/guest-js/index.ts                | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)
 create mode 100644 .changes/fs-write-uint8array-arraybuffer.md

diff --git a/.changes/fs-write-uint8array-arraybuffer.md b/.changes/fs-write-uint8array-arraybuffer.md
new file mode 100644
index 000000000..37b53d913
--- /dev/null
+++ b/.changes/fs-write-uint8array-arraybuffer.md
@@ -0,0 +1,6 @@
+---
+fs: patch
+fs-js: patch
+---
+
+`readFile` now returns a more specific type `Promise<Uint8Array<ArrayBuffer>>` instead of the default `Promise<Uint8Array<ArrayBufferLike>`
diff --git a/plugins/fs/guest-js/index.ts b/plugins/fs/guest-js/index.ts
index d4858b0e8..572cc1e85 100644
--- a/plugins/fs/guest-js/index.ts
+++ b/plugins/fs/guest-js/index.ts
@@ -739,7 +739,7 @@ interface ReadFileOptions {
 async function readFile(
   path: string | URL,
   options?: ReadFileOptions
-): Promise<Uint8Array> {
+): Promise<Uint8Array<ArrayBuffer>> {
   if (path instanceof URL && path.protocol !== 'file:') {
     throw new TypeError('Must be a file URL.')
   }