buildDocs/bindAll.js

import { copyMetadata } from './utils';
/**
 * Binds methods of an object to the object itself, overwriting the existing method.
 * @export
 * @param {string[]} [methods=[]]
 * @returns {ClassDecorator}
 * @example
 *
 * @BindAll()
 * class MyClass {
 *   bound() {
 *     return this;
 *   }
 *
 *   unbound() {
 *     return this;
 *   }
 * }
 *
 * const myClass = new MyClass();
 *
 * myClass.bound.call(null); // => MyClass {}
 * myClass.unbound.call(null); // => MyClass {}
 */
export function BindAll(methods = []) {
    return (target) => {
        function BindAllWrapper(...args) {
            bindAllMethods(target, this, methods);
            target.apply(this, args);
        }
        ;
        BindAllWrapper.prototype = target.prototype;
        return BindAllWrapper;
    };
}
function bindAllMethods(target, instance, methods = []) {
    let proto = target.prototype;
    while (proto && proto !== Object.prototype) {
        for (const key of Object.getOwnPropertyNames(proto)) {
            const include = methods.length ? methods.indexOf(key) !== -1 : true;
            const descriptor = Object.getOwnPropertyDescriptor(proto, key);
            if (include && key !== 'constructor' && !instance.hasOwnProperty(key)) {
                Object.defineProperty(instance, key, {
                    value: copyMetadata(instance[key].bind(instance), instance[key]),
                    configurable: true,
                    enumerable: descriptor.enumerable,
                    writable: descriptor.writable
                });
            }
        }
        proto = Object.getPrototypeOf(proto);
    }
}
export { BindAll as bindAll };
export default BindAll;