From e116b4c2388d60586acf6210bc1c3a10b932d6df Mon Sep 17 00:00:00 2001
From: George Fu <kuhe@users.noreply.github.com>
Date: Tue, 9 Jul 2024 16:43:01 -0400
Subject: [PATCH] fix(util-dynamodb): perform global interface check in
 NativeAttributeBinary union (#6261)

---
 packages/util-dynamodb/src/models.ts | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/packages/util-dynamodb/src/models.ts b/packages/util-dynamodb/src/models.ts
index b61953da7fc2..00e9b1caa0fb 100644
--- a/packages/util-dynamodb/src/models.ts
+++ b/packages/util-dynamodb/src/models.ts
@@ -1,5 +1,3 @@
-import type { Exact } from "@smithy/types";
-
 /**
  * A interface recognizable as a numeric value that stores the underlying number
  * as a string.
@@ -44,19 +42,17 @@ declare global {
   interface File {}
 }
 
-type Unavailable = never;
-type BlobDefined = Exact<Blob, {}> extends true ? false : true;
-type BlobOptionalType = BlobDefined extends true ? Blob : Unavailable;
+type IfDefined<T> = {} extends T ? never : T;
 
 /**
  * @public
  */
 export type NativeAttributeBinary =
   | ArrayBuffer
-  | BlobOptionalType
-  | Buffer
+  | IfDefined<Blob>
+  | IfDefined<Buffer>
   | DataView
-  | File
+  | IfDefined<File>
   | Int8Array
   | Uint8Array
   | Uint8ClampedArray