1 files changed, 4 insertions, 7 deletions
diff --git a/src/bun.js/builtins/js/ReadableStream.js b/src/bun.js/builtins/js/ReadableStream.js
index cd5cf5a44..1449c836d 100644
--- a/src/bun.js/builtins/js/ReadableStream.js
+++ b/src/bun.js/builtins/js/ReadableStream.js
@@ -381,7 +381,10 @@ function pipeTo(destination)
 {
     "use strict";
     if (!@isReadableStream(this))
-        throw @makeTypeError("readable should be ReadableStream");
+        return @Promise.@reject(@makeThisTypeError("ReadableStream", "pipeTo"));
+
+    if (@isReadableStreamLocked(this))
+        return @Promise.@reject(@makeTypeError("ReadableStream is locked"));
 
     // FIXME: https://bugs.webkit.org/show_bug.cgi?id=159869.
     // Built-in generator should be able to parse function signature to compute the function length correctly.
@@ -413,12 +416,6 @@ function pipeTo(destination)
     if (!@isWritableStream(internalDestination))
         return @Promise.@reject(@makeTypeError("ReadableStream pipeTo requires a WritableStream"));
 
-    if (!@isReadableStream(this))
-        return @Promise.@reject(@makeThisTypeError("ReadableStream", "pipeTo"));
-
-    if (@isReadableStreamLocked(this))
-        return @Promise.@reject(@makeTypeError("ReadableStream is locked"));
-
     if (@isWritableStreamLocked(internalDestination))
         return @Promise.@reject(@makeTypeError("WritableStream is locked"));