Highlight speaker on group calls

ts/hooks/useValueAtFixedRate.ts

@@ -0,0 +1,19 @@
+// Copyright 2022 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { useEffect, useState } from 'react';
+
+export function useValueAtFixedRate<T>(value: T, rate: number): T {
+  const [currentValue, setCurrentValue] = useState(value);
+
+  useEffect(() => {
+    const timeout = setTimeout(() => {
+      setCurrentValue(value);
+    }, rate);
+    return () => {
+      clearTimeout(timeout);
+    };
+  }, [value, rate]);
+
+  return currentValue;
+}