fix: format slow listener logs

src/infra/format-duration.ts

@@ -0,0 +1,34 @@
+export type FormatDurationSecondsOptions = {
+  decimals?: number;
+  unit?: "s" | "seconds";
+};
+
+export function formatDurationSeconds(
+  ms: number,
+  options: FormatDurationSecondsOptions = {},
+): string {
+  if (!Number.isFinite(ms)) return "unknown";
+  const decimals = options.decimals ?? 1;
+  const unit = options.unit ?? "s";
+  const seconds = Math.max(0, ms) / 1000;
+  const fixed = seconds.toFixed(Math.max(0, decimals));
+  const trimmed = fixed.replace(/\.0+$/, "").replace(/(\.\d*[1-9])0+$/, "$1");
+  return unit === "seconds" ? `${trimmed} seconds` : `${trimmed}s`;
+}
+
+export type FormatDurationMsOptions = {
+  decimals?: number;
+  unit?: "s" | "seconds";
+};
+
+export function formatDurationMs(
+  ms: number,
+  options: FormatDurationMsOptions = {},
+): string {
+  if (!Number.isFinite(ms)) return "unknown";
+  if (ms < 1000) return `${ms}ms`;
+  return formatDurationSeconds(ms, {
+    decimals: options.decimals ?? 2,
+    unit: options.unit ?? "s",
+  });
+}