From e5eabc0658d2133603596ec17a6e7c956c5fe28c Mon Sep 17 00:00:00 2001
From: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>
Date: Thu, 2 Jun 2022 03:00:45 -0700
Subject: Faster ReadableStream

---
 .../bindings/builtins/js/ReadableByteStreamController.js    | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

(limited to 'src/javascript/jsc/bindings/builtins/js/ReadableByteStreamController.js')

diff --git a/src/javascript/jsc/bindings/builtins/js/ReadableByteStreamController.js b/src/javascript/jsc/bindings/builtins/js/ReadableByteStreamController.js
index fac5c864c..0b47d730c 100644
--- a/src/javascript/jsc/bindings/builtins/js/ReadableByteStreamController.js
+++ b/src/javascript/jsc/bindings/builtins/js/ReadableByteStreamController.js
@@ -89,12 +89,17 @@ function byobRequest()
     if (!@isReadableByteStreamController(this))
         throw @makeGetterTypeError("ReadableByteStreamController", "byobRequest");
 
-    if (@getByIdDirectPrivate(this, "byobRequest") === @undefined && @getByIdDirectPrivate(this, "pendingPullIntos").length) {
-        const firstDescriptor = @getByIdDirectPrivate(this, "pendingPullIntos")[0];
-        const view = new @Uint8Array(firstDescriptor.buffer,
+    
+    var request = @getByIdDirectPrivate(this, "byobRequest");
+    if (request === @undefined) {
+        var pending = @getByIdDirectPrivate(this, "pendingPullIntos");
+        const firstDescriptor = pending.peek();
+        if (firstDescriptor) {
+            const view = new @Uint8Array(firstDescriptor.buffer,
             firstDescriptor.byteOffset + firstDescriptor.bytesFilled,
             firstDescriptor.byteLength - firstDescriptor.bytesFilled);
-        @putByIdDirectPrivate(this, "byobRequest", new @ReadableStreamBYOBRequest(this, view, @isReadableStream));
+            @putByIdDirectPrivate(this, "byobRequest", new @ReadableStreamBYOBRequest(this, view, @isReadableStream));
+        }
     }
 
     return @getByIdDirectPrivate(this, "byobRequest");
-- 
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