perf: optimise list hot paths and shared timers

1 files changed, 14 insertions, 0 deletions

diff --git a/src/stores/airingNow.ts b/src/stores/airingNow.ts
new file mode 100644
index 00000000..697001ef
--- /dev/null
+++ b/src/stores/airingNow.ts
@@ -0,0 +1,14 @@
+import { browser } from '$app/environment';
+import { readable } from 'svelte/store';
+
+const TICK_INTERVAL_MS = 30 * 1000;
+
+const airingNow = readable(Date.now(), (set) => {
+  if (!browser) return () => undefined;
+
+  const interval = setInterval(() => set(Date.now()), TICK_INTERVAL_MS);
+
+  return () => clearInterval(interval);
+});
+
+export default airingNow;