1 files changed, 8 insertions, 4 deletions
diff --git a/src/bun.js/builtins/js/StreamInternals.js b/src/bun.js/builtins/js/StreamInternals.js
index 78bcdcfb3..0f08b7901 100644
--- a/src/bun.js/builtins/js/StreamInternals.js
+++ b/src/bun.js/builtins/js/StreamInternals.js
@@ -271,9 +271,11 @@ function resetQueue(queue)
 
 function extractSizeAlgorithm(strategy)
 {
-    if (!("size" in strategy))
+    const sizeAlgorithm = strategy.size;
+
+    if (sizeAlgorithm === @undefined)
         return () => 1;
-    const sizeAlgorithm = strategy["size"];
+
     if (typeof sizeAlgorithm !== "function")
         @throwTypeError("strategy.size must be a function");
 
@@ -282,9 +284,11 @@ function extractSizeAlgorithm(strategy)
 
 function extractHighWaterMark(strategy, defaultHWM)
 {
-    if (!("highWaterMark" in strategy))
+    const highWaterMark = strategy.highWaterMark;
+
+    if (highWaterMark === @undefined)
         return defaultHWM;
-    const highWaterMark = strategy["highWaterMark"];
+
     if (@isNaN(highWaterMark) || highWaterMark < 0)
         @throwRangeError("highWaterMark value is negative or not a number");