From 457ab3301782e4e91334961208c5e4bbde95987d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Fri, 10 Dec 2021 03:04:34 +0100
Subject: Add various type specifiers.

---
 static/clock.ts | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

(limited to 'static/clock.ts')

diff --git a/static/clock.ts b/static/clock.ts
index a2d22e00..b0ddae00 100644
--- a/static/clock.ts
+++ b/static/clock.ts
@@ -2,9 +2,8 @@ export { SmallcalCellHighlight, Timebar }
 
 import { makeElement, date_to_percent } from './lib'
 
-class Clock {
-    update(now: Date) {
-    }
+abstract class Clock {
+    abstract update(now: Date): void;
 }
 
 
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