stream: use ByteLengthQueuingStrategy when not in objectMode

Fixes: https://github.com/nodejs/node/issues/46347
PR-URL: https://github.com/nodejs/node/pull/48847
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

lib/internal/webstreams/adapters.js

@@ -31,6 +31,7 @@ const {
 
 const {
   CountQueuingStrategy,
+  ByteLengthQueuingStrategy,
 } = require('internal/webstreams/queuingstrategies');
 
 const {
@@ -452,11 +453,7 @@ function newReadableStreamFromStreamReadable(streamReadable, options = kEmptyObj
       return new CountQueuingStrategy({ highWaterMark });
     }
 
-    // When not running in objectMode explicitly, we just fall
+    return new ByteLengthQueuingStrategy({ highWaterMark });
-    // back to a minimal strategy that just specifies the highWaterMark
-    // and no size algorithm. Using a ByteLengthQueuingStrategy here
-    // is unnecessary.
-    return { highWaterMark };
   };
 
   const strategy = evaluateStrategyOrFallback(options?.strategy);

test/parallel/test-stream-readable-to-web.js

@@ -0,0 +1,62 @@
+'use strict';
+const common = require('../common');
+if (!common.hasCrypto) { common.skip('missing crypto'); }
+
+const { Readable } = require('stream');
+const process = require('process');
+const { randomBytes } = require('crypto');
+const assert = require('assert');
+
+// Based on: https://github.com/nodejs/node/issues/46347#issuecomment-1413886707
+// edit: make it cross-platform as /dev/urandom is not available on Windows
+{
+  let currentMemoryUsage = process.memoryUsage().arrayBuffers;
+
+  // We initialize a stream, but not start consuming it
+  const randomNodeStream = new Readable({
+    read(size) {
+      randomBytes(size, (err, buffer) => {
+        if (err) {
+          // If an error occurs, emit an 'error' event
+          this.emit('error', err);
+          return;
+        }
+
+        // Push the random bytes to the stream
+        this.push(buffer);
+      });
+    }
+  });
+  // after 2 seconds, it'll get converted to web stream
+  let randomWebStream;
+
+  // We check memory usage every second
+  // since it's a stream, it shouldn't be higher than the chunk size
+  const reportMemoryUsage = () => {
+    const { arrayBuffers } = process.memoryUsage();
+    currentMemoryUsage = arrayBuffers;
+
+    assert(currentMemoryUsage <= 256 * 1024 * 1024);
+  };
+  setInterval(reportMemoryUsage, 1000);
+
+  // after 1 second we use Readable.toWeb
+  // memory usage should stay pretty much the same since it's still a stream
+  setTimeout(() => {
+    randomWebStream = Readable.toWeb(randomNodeStream);
+  }, 1000);
+
+  // after 2 seconds we start consuming the stream
+  // memory usage will grow, but the old chunks should be garbage-collected pretty quickly
+  setTimeout(async () => {
+    // eslint-disable-next-line no-unused-vars
+    for await (const _ of randomWebStream) {
+      // Do nothing, just let the stream flow
+    }
+  }, 2000);
+
+  setTimeout(() => {
+    // Test considered passed if we don't crash
+    process.exit(0);
+  }, 5000);
+}