A validator to validator range of number

validate-number-range.validator.ts

import {AbstractControl, ValidatorFn} from '@angular/forms';

export function validateNumberRange(min: number, max:number): ValidatorFn {
   return  (control: AbstractControl): { [key:string]: any } => {
        var value =  parseInt(control.value,10);
        return (isNaN(value) || (value < min) || (value > max)) ?
            {'numberRange' : {'min': min, 'max':max, 'actualValue': value}} : 
            null
    }
}