import { eventHandler } from "h3";
export const globalTiming = globalThis.__timing__ || {
  start: () => 0,
  end: () => 0,
  metrics: []
};
export const timingMiddleware = eventHandler((event) => {
  const start = globalTiming.start();
  const _end = event.res.end;
  event.res.end = function(chunk, encoding, cb) {
    const metrics = [["Generate", globalTiming.end(start)], ...globalTiming.metrics];
    const serverTiming = metrics.map((m) => `-;dur=${m[1]};desc="${encodeURIComponent(m[0])}"`).join(", ");
    if (!event.res.headersSent) {
      event.res.setHeader("Server-Timing", serverTiming);
    }
    _end.call(event.res, chunk, encoding, cb);
    return this;
  }.bind(event.res);
});