Timing and Grouping

Problem

You need to measure how long a code block takes and group the related log entries so they are easy to correlate in output — without sprinkling Date.now() calls across the codebase.

Solution

import { Logit } from '@vielzeug/logit';

const result = await Logit.groupCollapsed('Checkout', async () => {
  Logit.info('validating cart');

  return Logit.time('process-order', () => processOrder(cart));
});

Pitfalls

• console.time()/console.timeEnd() share a global namespace. Two concurrent operations using the same label will interfere. Use unique labels (e.g., include a request ID) per measurement.
• The timer measures wall-clock time, not CPU time. Event-loop blocking is indistinguishable from a long async wait. Use performance.now() for higher-precision measurements.
• Log grouping is a transport concern. Plain text transports output group entries as flat lines with no visual nesting — only console-based or structured transports render groups.

Related

• Child Logger Overrides
• Module Logger Pattern
• Production Setup