From efc5475d369af620a46a023bbc15b0c5346f9280 Mon Sep 17 00:00:00 2001
From: Eric Fredricksen <efredricksen@gmail.com>
Date: Mon, 13 Dec 2021 21:24:10 -0800
Subject: [PATCH] oops missing this file

---
 clock.js | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 clock.js

diff --git a/clock.js b/clock.js
new file mode 100644
index 0000000..0442271
--- /dev/null
+++ b/clock.js
@@ -0,0 +1,16 @@
+let timerID;
+self.addEventListener('message', e => {
+    switch (e.data) {
+        case 'start':
+            if (!timerID) {
+                timerID = setInterval(() => {
+                    self.postMessage('tick');
+                }, 50);
+            }
+            break;
+        case 'stop':
+            clearInterval(timerID);
+            timerID = null;
+            break;
+    };
+}, false);
\ No newline at end of file