print simple perf measurement

withMeasure.ts

async function withMeasure<T>(label: string = 'Measurement', fn: () => Promise<T>) {
  function bytes2MB(bytes: number): number {
    return bytes / (1024 * 1024)
  }

  const pstart = performance.now()
  const mstart = process.memoryUsage().heapUsed

  const result = await fn()

  const mend = process.memoryUsage().heapUsed
  const mused = mend - mstart
  const pend = performance.now()
  const duration = pend - pstart

  console.log(`${label}: ${duration} milliseconds ${mused} bytes ${bytes2MB(mused)} MB`)
  console.log(`mStart: ${mstart} mEnd: ${mend} bytes`)
  console.log(`pStart: ${pstart} pEnd: ${pend} bytes`)
  console.log('---')

  return result
}