marionebl/jogwheel

/**
 * createTrap
 * Traps writes to property targetName on host and calls handler instead
 *
 * @param host {object} object holding the trapped object as property
 * @param prisonerName {string} propertyName of the object ot trap
 * @param warden {function} handler function to execute instead of setter builtin
 * @returns prison {object} host with trapped targetName property
 * @private
 */
export default function createTrap(host, prisonerName, warden) {
    const prison = {...host};
    const cell = {...(host[prisonerName] || {})};

    Object.defineProperty(prison, prisonerName, { // eslint-disable-line prefer-reflect
        configurable: true,
        enumerable: prison.propertyIsEnumerable(prisonerName),

        get() {
            const trap = {...cell};

            setTimeout(() => {
                for (const key in trap) {
                    if (trap.hasOwnProperty(key)) {
                        if (cell[key] !== trap[key]) {
                            cell[key] = warden(host, key, trap[key]);
                        }
                    }
                }
            });

            return trap;
        }
    });

    return prison;
}