Max Min Limit setup in custom visual

I don't know if you already got it, but I managed to do it with something like this (in your settings.ts file):

import powerbi from "powerbi-visuals-api";

...
class MyMaxValidator implements powerbi.visuals.MaxValidator<number> {
   type: powerbi.visuals.ValidatorType.Max;
   value: number;

   constructor(max: number) {
       this.value = max;
   }
}
class MyMinValidator implements powerbi.visuals.MinValidator<number> {
   type: powerbi.visuals.ValidatorType.Min;
   value: number;

   constructor(min: number) {
       this.value = min;
   }
}

...

public maxAreaHeightX = new formattingSettings.Slider({
  name: "maxAreaHeightX",
  displayName: "Max Area Height",
  value: 20,
  options: { maxValue: new MyMaxValidator(30), minValue: new MyMinValidator(10) }    
});