Function fetchCastDuration

e2e/viewer/src/SessionPlayer.tsx:54–59

(url: string)

/** The cast's own duration: timestamp of its last event (the file is local
 *  and line-delimited, cheaper and more deterministic than player events). */
const fetchCastDuration = async (url: string): Promise<number> => {
  const text = await fetch(url).then((r) => r.text());
  const last = text.trimEnd().split("\n").at(-1);
  if (!last || last.startsWith("{")) return 0;
  return (JSON.parse(last) as [number])[0] ?? 0;
};

export const SessionPlayer = ({
  castUrl,