How is removing letter timing is calculated?

[bohdanafanasyev]

Greetings,

After inspecting the source code 2 properties have been encountered letterInerval and letterSelectInterval, I did expect that last one is responsible for controlling letter removing speed, but when I tried both rewriting the value of source code and defining on a constructor it appears that it affects both appearing and deleting the letter and letterInterval value is kind of ignored.

new Typist(typist, {
    letterInterval: 100,
    letterSelectInterval: 1000,

    onSlide: (text, options) => {
      options.letterInterval =  100
      options.letterSelectInterval = 1000
      console.log(options)
    }
  });
})

Can you please suggest what would be the proper way to control the removing speed?