Event is fired multiple times

[YuriVivaldi]

Hi, I'm using this library to read a button status via GPIO
The code is simply this:

class GpioCtrl{

   emitter: EventEmitter

   button = new Gpio(GPIO.BUTTON, 'in', 'both', { activeLow: true, debounceTimeout: 1000 });

   constructor(event_emitter: EventEmitter) {
      this.emitter = event_emitter
   }

   async setup(): Promise<void> {

      this.button.watch((err, value) => {
         console.debug('Btn event', value,'\nErr: ',err, Date.now())
         if (err) { console.error(GpioEvents.button, err); throw err; }
         else
            this.emitter.emit(GpioEvents.button, value)
  })
}

When run, this is the printout (the minus and plus are to show which are the events that should be fired, and which not):

(previous prints)
(missing print on activated gpio )
+ Btn event 0 
Err:  null 1683026447408
+ Btn event 1 
Err:  null 1683026451988
- Btn event 1 
Err:  null 1683026451995
+ Btn event 0 
Err:  null 1683026455587
- Btn event 0 
Err:  null 1683026455592
- Btn event 0 
Err:  null 1683026455595
+ Btn event 1 
Err:  null 1683026458666
- Btn event 1 
Err:  null 1683026458673
- Btn event 1 
Err:  null 1683026458676
- Btn event 1 
Err:  null 1683026458678
+ Btn event 0 
Err:  null 1683026461938
- Btn event 0 
Err:  null 1683026461942
- Btn event 0 
Err:  null 1683026461945
- Btn event 0 
Err:  null 1683026461950
- Btn event 0 
Err:  null 1683026461952

and keeps like that, firing each change in value more times ,i.e. :

• 1st change => prints nothing, should detect a 1 in the pin and fire an event
• 2nd change => fires one event, (as it should)
• 3rd change => fires two events, should fire a single event, value 1
• 4th change => fires three events, should fire a single event, value 0
• 5th change => fires four events, should fire a single event, value 1
• 6th change => fires five events, should fire a single event, value 0

Can anyone help me diagnose?
Thank you in advance