Function validate

create accessor callbacks for a field

validate(set?, get?): ((target: any, propertyKey: string, descriptor?: undefined) => void)
Parameters
- Optionalset: setter
- Optionalget: getter
Returns ((target: any, propertyKey: string, descriptor?: undefined) => void)
- - (target, propertyKey, descriptor?): void
  - Parameters
    - target: any
    - propertyKey: string
    - Optionaldescriptor: undefined
    Returns void