events: add support for EventTarget in once

PR-URL: https://github.com/nodejs/node/pull/29498
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/events.js b/lib/events.js
index ebde85c6dd..f6e4996d20 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -497,6 +497,17 @@ function unwrapListeners(arr) {
 
 function once(emitter, name) {
   return new Promise((resolve, reject) => {
+    if (typeof emitter.addEventListener === 'function') {
+      // EventTarget does not have `error` event semantics like Node
+      // EventEmitters, we do not listen to `error` events here.
+      emitter.addEventListener(
+        name,
+        (...args) => { resolve(args); },
+        { once: true }
+      );
+      return;
+    }
+
     const eventListener = (...args) => {
       if (errorListener !== undefined) {
         emitter.removeListener('error', errorListener);