feat: type-safe SSE rewrite

app/sse/[topic]/route.ts

@@ -0,0 +1,21 @@
+import { sse, tlSse } from "@/lib/db/sse-endpoints";
+
+function isValidKey<T extends { [x: string]: unknown }>(
+  map: T,
+  key: string | number | symbol,
+): key is keyof T {
+  return Object.hasOwn(map, key);
+}
+
+const tlRegex = /^tl\.([a-z0-9.-_]+)$/;
+
+export async function GET(
+  _req: Request,
+  { params }: { params: Promise<{ topic: string }> },
+) {
+  const { topic } = await params;
+  if (tlRegex.test(topic)) return tlSse(topic.match(tlRegex)![1]).stream();
+  if (!isValidKey(sse, topic))
+    return new Response("Invalid SSE Endpoint", { status: 404 });
+  return sse[topic].stream();
+}