decoval/lib/dv/dv.boolean.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 { ValidationError } from "./error/validation.error";
import { registerValidation } from "./register.validation";
export function DvBoolean(options = {}) {
    const { message, optional = false, empty = false, null: allowNull = false } = options;
    if (optional && allowNull) {
        throw new Error("The 'optional' and 'null' options cannot be used together.");
    }
    return function (target, propertyKey) {
        const alreadyApplied = Reflect.getMetadata("valboolean:applied", target, propertyKey);
        if (alreadyApplied) {
            throw new Error(`The @DvBoolean decorator has already been applied to the field"${propertyKey}"`);
        }
        Reflect.defineMetadata("valboolean:applied", true, target, propertyKey);
        registerValidation(target, propertyKey, (value) => {
            if (value === undefined && optional)
                return;
            if (value === null && allowNull)
                return;
            if (value === "" && empty)
                return;
            if (typeof value !== "boolean") {
                throw new ValidationError(typeof message === "string" ? message : `The "${propertyKey}" field must be a boolean value.`);
            }
        });
    };
}