trace-profile

Tool that allows you to record time a function and all nested calls are taking.

npm i trace-profile

#How to reacord calls Let's say you have next code you want to profile:

function a() {
  b()
}

function b() {
  c()
}

Create a tracer instance:

const tracer = new Trace({
  now: () => performance.now(),
  tracingStartsWithLabel: 'firstLabel'
})

and do folowing:

function a() {
  tracer.time('a')
  b()
  tracer.timeEnd('a')
}

function b() {
  tracer.time('b')
  ...
  tracer.timeEnd('b')
}

When you want to see a result just call tracer.printCall(0) and you will get a string: a: n ms b: m ms

You also can see all calls tracer.printAllCalls()

Why do I need tracingStartsWithLabel:

Imagin you have a function a which looks like this:

function a() {
  tracer.time('a')
  b()
  tracer.timeEnd('a')
}

function b() {
  tracer.time('b')
  ...
  tracer.timeEnd('b')
}

As you can see it has call of function b inside itself. We don't want to trace direct call to b() only do tracing when it was call from a().