From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 02:47:55 +0200
Subject: Adding upstream version 124.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 browser/components/syncedtabs/EventEmitter.sys.mjs | 36 ++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 browser/components/syncedtabs/EventEmitter.sys.mjs

(limited to 'browser/components/syncedtabs/EventEmitter.sys.mjs')

diff --git a/browser/components/syncedtabs/EventEmitter.sys.mjs b/browser/components/syncedtabs/EventEmitter.sys.mjs
new file mode 100644
index 0000000000..ed026dc173
--- /dev/null
+++ b/browser/components/syncedtabs/EventEmitter.sys.mjs
@@ -0,0 +1,36 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Simple event emitter abstraction for storage objects to use.
+export function EventEmitter() {
+  this._events = new Map();
+}
+
+EventEmitter.prototype = {
+  on(event, listener) {
+    if (this._events.has(event)) {
+      this._events.get(event).add(listener);
+    } else {
+      this._events.set(event, new Set([listener]));
+    }
+  },
+  off(event, listener) {
+    if (!this._events.has(event)) {
+      return;
+    }
+    this._events.get(event).delete(listener);
+  },
+  emit(event, ...args) {
+    if (!this._events.has(event)) {
+      return;
+    }
+    for (let listener of this._events.get(event).values()) {
+      try {
+        listener.apply(this, args);
+      } catch (e) {
+        console.error(e);
+      }
+    }
+  },
+};
-- 
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