stream: fix pipeline with dest in objectMode

pipeline did not support destination with generator that does not return strings or buffers.
nodejs · Mar 25, 2020 · ee3aa34 · ee3aa34
1 parent 9e3eddc
commit ee3aa34
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diff --git a/lib/internal/streams/pipeline.js b/lib/internal/streams/pipeline.js
@@ -240,7 +240,9 @@ function pipeline(...streams) {
         // always returns a stream which can be further
         // composed through `.pipe(stream)`.
 
-        const pt = new PassThrough();
+        const pt = new PassThrough({
+          objectMode: true
+        });
         if (isPromise(ret)) {
           ret
             .then((val) => {

diff --git a/test/parallel/test-stream-pipeline.js b/test/parallel/test-stream-pipeline.js
@@ -1065,3 +1065,15 @@ const { promisify } = require('util');
   src.push('asd');
   dst.destroy();
 }
+
+{
+  pipeline(async function * () {
+    yield 'asd';
+  }, async function * (source) {
+    for await (const chunk of source) {
+      yield { chunk };
+    }
+  }, common.mustCall((err) => {
+    assert.ifError(err);
+  }));
+}