1 files changed, 22 insertions, 3 deletions
diff --git a/cli/js/web/util.ts b/cli/js/web/util.ts
index 19a30a675..2d63b4d60 100644
--- a/cli/js/web/util.ts
+++ b/cli/js/web/util.ts
@@ -1,9 +1,28 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
-export type TypedArray = Uint8Array | Float32Array | Int32Array;
-const TypedArrayConstructor = Object.getPrototypeOf(Uint8Array);
+export type TypedArray =
+  | Int8Array
+  | Uint8Array
+  | Uint8ClampedArray
+  | Int16Array
+  | Uint16Array
+  | Int32Array
+  | Uint32Array
+  | Float32Array
+  | Float64Array;
+
 export function isTypedArray(x: unknown): x is TypedArray {
-  return x instanceof TypedArrayConstructor;
+  return (
+    x instanceof Int8Array ||
+    x instanceof Uint8Array ||
+    x instanceof Uint8ClampedArray ||
+    x instanceof Int16Array ||
+    x instanceof Uint16Array ||
+    x instanceof Int32Array ||
+    x instanceof Uint32Array ||
+    x instanceof Float32Array ||
+    x instanceof Float64Array
+  );
 }
 
 // @internal