pre-bemis

lib/perf/serverTiming.ts

@@ -0,0 +1,18 @@
+import { performance } from "perf_hooks";
+
+export const PERF_LOGS_ENABLED = process.env.PERF_LOGS === "1";
+
+export function nowMs() {
+  return performance.now();
+}
+
+export function elapsedMs(startMs: number) {
+  return Math.round((performance.now() - startMs) * 100) / 100;
+}
+
+export function formatServerTiming(entries: Record<string, number>) {
+  return Object.entries(entries)
+    .filter(([, value]) => Number.isFinite(value))
+    .map(([name, value]) => `${name};dur=${value.toFixed(1)}`)
+    .join(", ");
+}