Function start

test/tracing.test.js:42–42

(ctx)

      const events = [];
      const handlers = {
        start(ctx) { events.push({ event: 'start', ...ctx }); },
        end() { events.push({ event: 'end' }); },
        asyncStart(ctx) { events.push({ event: 'asyncStart', result: ctx.result }); },
        asyncEnd(ctx) { events.push({ event: 'asyncEnd', result: ctx.result }); },