tiny-types/lib/predicates/property.js

A tiny library that brings Tiny Types to JavaScript and TypeScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.property = property;
const and_1 = require("./and");
const Predicate_1 = require("./Predicate");
/**
 * @desc Ensures that the `property` of the `value` meets the `predicates`
 *
 * @example
 * import { ensure, isGreaterThan, property, TinyType } from 'tiny-types';
 *
 * class Name extends TinyType {
 *     constructor(public readonly value: string) {
 *         super();
 *         ensure('Name', value, property('length', isGreaterThan(3)));
 *     }
 * }
 *
 * @returns {Predicate<T>}
 */
function property(propertyName, ...predicates) {
    return new HaveProperty(propertyName, (0, and_1.and)(...predicates));
}
/** @access private */
class HaveProperty extends Predicate_1.Predicate {
    propertyName;
    predicate;
    constructor(propertyName, predicate) {
        super();
        this.propertyName = propertyName;
        this.predicate = predicate;
    }
    /** @override */
    check(value) {
        const result = this.predicate.check(value[this.propertyName]);
        return result instanceof Predicate_1.Failure
            ? new Predicate_1.Failure(value, `have a property "${String(this.propertyName)}" that ${result.description}`
                .replaceAll(/\bbe\b/gi, 'is')
                .replaceAll(/\beither is\b/gi, 'is either'))
            : new Predicate_1.Success(value);
    }
}
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