From f0b08389ff63c6c2f979d4b99235c12db7818c37 Mon Sep 17 00:00:00 2001
From: Chris L <stylesuxx@gmail.com>
Date: Tue, 23 Mar 2021 18:38:35 +0100
Subject: [PATCH] Add and remove listeners

---
 serial.ts | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/serial.ts b/serial.ts
index 4e0c7ab..68e8497 100644
--- a/serial.ts
+++ b/serial.ts
@@ -600,6 +600,29 @@ class Serial {
     });
     return ports;
   }
+
+  /**
+   * Attach an event listener.
+   *
+   * @param {string} event the event to listen for.
+   * @param {Function} handleEvent the function to be triggered on the event.
+   */
+  addEventListener(event: 'connect' | 'disconnect',
+      handleEvent: EventListener | EventListenerObject | null): void {
+    navigator.usb.addEventListener(event, handleEvent);
+  }
+
+  /**
+   * Remove an event listener.
+   *
+   * @param {string} event the event for which the listener should be removed.
+   * @param {Function} handleEvent the handler to be removed.
+   */
+  removeEventListener(event: 'connect' | 'disconnect',
+      handleEvent: EventListener | EventListenerObject | null):
+      void {
+    navigator.usb.removeEventListener(event, handleEvent);
+  }
 }
 
 /* an object to be used for starting the serial workflow */