From cb0fc6520acc9ee59e18096877418dde1e799641 Mon Sep 17 00:00:00 2001
From: himself65 <himself6565@gmail.com>
Date: Wed, 30 Jan 2019 22:34:55 +0800
Subject: [PATCH] events: onceWrapper returns target value

PR-URL: https://github.com/nodejs/node/pull/25818
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
---
 lib/events.js                                 |  2 +-
 test/parallel/test-event-emitter-listeners.js | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/lib/events.js b/lib/events.js
index 3fce38f881b9fb..4ee96024895f45 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -274,7 +274,7 @@ function onceWrapper(...args) {
   if (!this.fired) {
     this.target.removeListener(this.type, this.wrapFn);
     this.fired = true;
-    Reflect.apply(this.listener, this.target, args);
+    return Reflect.apply(this.listener, this.target, args);
   }
 }
 
diff --git a/test/parallel/test-event-emitter-listeners.js b/test/parallel/test-event-emitter-listeners.js
index 9d2892d2e891ae..52a108ad0e29b6 100644
--- a/test/parallel/test-event-emitter-listeners.js
+++ b/test/parallel/test-event-emitter-listeners.js
@@ -27,6 +27,12 @@ const events = require('events');
 
 function listener() {}
 function listener2() {}
+function listener3() {
+  return 0;
+}
+function listener4() {
+  return 1;
+}
 
 {
   const ee = new events.EventEmitter();
@@ -101,3 +107,15 @@ function listener2() {}
   assert.strictEqual(wrappedListeners.length, 2);
   assert.strictEqual(wrappedListeners[1].listener, listener);
 }
+
+{
+  const ee = new events.EventEmitter();
+  ee.once('foo', listener3);
+  ee.on('foo', listener4);
+  const rawListeners = ee.rawListeners('foo');
+  assert.strictEqual(rawListeners.length, 2);
+  assert.strictEqual(rawListeners[0](), 0);
+  const rawListener = ee.rawListeners('foo');
+  assert.strictEqual(rawListener.length, 1);
+  assert.strictEqual(rawListener[0](), 1);
+}