fixup! optimize backpressure check

Author: MattiasBuelens

lib/internal/webstreams/readablestream.js

@@ -127,7 +127,6 @@ const {
   writableStreamAbort,
   writableStreamCloseQueuedOrInFlight,
   writableStreamDefaultWriterCloseWithErrorPropagation,
-  writableStreamDefaultWriterGetDesiredSize,
   writableStreamDefaultWriterRelease,
   writableStreamDefaultWriterWrite,
 } = require('internal/webstreams/writablestream');
@@ -1564,12 +1563,12 @@ function readableStreamPipeTo(
         setPromiseHandled(state.currentWrite);
 
         // Check backpressure after each write
-        if (dest[kState].state === 'writable') {
-          const desiredSize = writableStreamDefaultWriterGetDesiredSize(writer);
-          if (desiredSize !== null && desiredSize <= 0) {
-            // Backpressure - stop batch and wait for ready
-            break;
-          }
+        if (dest[kState].backpressure) {
+          // Backpressure - stop batch and wait for ready
+          break;
+        } else if (dest[kState].state !== 'writable' || writableStreamCloseQueuedOrInFlight(dest)) {
+          // Closing or erroring - stop batch and wait for shutdown
+          break;
         }
       }