fix(runtime): don't error `child.output()` on consumed stream (#25657)

This fixes the fast path for `readableStreamCollectIntoUint8Array` to
only trigger if the readable stream has not yet been disturbed -
because otherwise we may not be able to close it if the
read errors.

1 files changed, 1 insertions, 1 deletions

diff --git a/ext/web/06_streams.js b/ext/web/06_streams.js
index 1dbf769b2..a4f2275c5 100644
--- a/ext/web/06_streams.js
+++ b/ext/web/06_streams.js
@@ -1054,7 +1054,7 @@ async function readableStreamCollectIntoUint8Array(stream) {
     getReadableStreamResourceBackingUnrefable(stream);
   const reader = acquireReadableStreamDefaultReader(stream);
 
-  if (resourceBacking) {
+  if (resourceBacking && !isReadableStreamDisturbed(stream)) {
     // fast path, read whole body in a single op call
     try {
       readableStreamDisturb(stream);