decoval/lib/dv/dv.validation.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 "./error/validation.SkipError";
import { validationMetadata } from "./register.validation";
export function decoValidation(instance) {
    return new Promise((resolve, reject) => {
        const errors = {};
        const constructorName = instance.constructor.name;
        for (const key of Object.keys(instance)) {
            const propertyKey = `${constructorName}.${key}`;
            const value = instance[key];
            const validators = validationMetadata.get(propertyKey);
            if (!validators)
                continue;
            try {
                for (const validate of validators) {
                    validate(value);
                }
            }
            catch (err) {
                if (err instanceof ValidationSkipError) {
                    continue;
                }
                const message = err instanceof Error ? err.message : String(err);
                if (!errors[key])
                    errors[key] = [];
                errors[key].push(message);
            }
        }
        Object.keys(errors).length > 0 ? reject(errors) : resolve(instance);
    });
}