decoval/lib/helpers/optional.js

DecoVal is a decorator-driven validation pattern that allows you to add validation rules directly to the properties of TypeScript classes, simplifying data control and increasing code readability and reusability.

import { ValidationSkipError } from "../dv/error/validation.SkipError";
import { registerValidation } from "../dv/register.validation";
export function Optional() {
    return (target, key) => {
        registerValidation(target, key, (value) => {
            const isSkipped = value === undefined || value === null || value === "";
            if (isSkipped) {
                throw new ValidationSkipError();
            }
        });
    };
}