fix(node/fs): node:fs.read and write should accept typed arrays other than Uint8Array (#25030)

Part of #25028.

Our underlying read/write operations in `io` assume the buffer is a
Uint8Array, but we were passing in other typed arrays (in the case above
it was `Int8Array`).

1 files changed, 10 insertions, 0 deletions

diff --git a/ext/node/polyfills/internal/fs/utils.mjs b/ext/node/polyfills/internal/fs/utils.mjs
index 9f3322bae..53184b9c3 100644
--- a/ext/node/polyfills/internal/fs/utils.mjs
+++ b/ext/node/polyfills/internal/fs/utils.mjs
@@ -986,6 +986,16 @@ export const validatePosition = hideStackFrames((position) => {
   }
 });
 
+/** @type {(buffer: ArrayBufferView) => Uint8Array} */
+export const arrayBufferViewToUint8Array = hideStackFrames(
+  (buffer) => {
+    if (!(buffer instanceof Uint8Array)) {
+      return new Uint8Array(buffer.buffer);
+    }
+    return buffer;
+  },
+);
+
 export const realpathCacheKey = Symbol("realpathCacheKey");
 export const constants = {
   kIoMaxLength,