stream: only use legacy close listeners if not willEmitClose

Some streams that willEmitClose unecessarily fallback to legacy
events.

PR-URL: #36649
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

lib/internal/streams/end-of-stream.js

@@ -129,7 +129,9 @@ function eos(stream, options, callback) {
 
   if (isRequest(stream)) {
     stream.on('complete', onfinish);
-    stream.on('abort', onclose);
+    if (!willEmitClose) {
+      stream.on('abort', onclose);
+    }
     if (stream.req) onrequest();
     else stream.on('request', onrequest);
   } else if (writable && !wState) { // legacy streams
@@ -138,7 +140,7 @@ function eos(stream, options, callback) {
   }
 
   // Not all streams will emit 'close' after 'aborted'.
-  if (typeof stream.aborted === 'boolean') {
+  if (!willEmitClose && typeof stream.aborted === 'boolean') {
     stream.on('aborted', onclose);
   }
 

test/parallel/test-stream-finished.js

@@ -492,3 +492,26 @@ testClosed((opts) => new Writable({ write() {}, ...opts }));
       .on('response', common.mustCall());
   });
 }
+
+
+{
+  const w = new Writable({
+    write(chunk, encoding, callback) {
+      process.nextTick(callback);
+    }
+  });
+  w.aborted = false;
+  w.end();
+  let closed = false;
+  w.on('finish', () => {
+    assert.strictEqual(closed, false);
+    w.emit('aborted');
+  });
+  w.on('close', common.mustCall(() => {
+    closed = true;
+  }));
+
+  finished(w, common.mustCall(() => {
+    assert.strictEqual(closed, true);
+  }));
+}