can-define-lazy-value/dist/amd/define-lazy-value.js

Define properties with lazy values using Object.defineProperty

/*can-define-lazy-value@1.1.0#define-lazy-value*/
define('can-define-lazy-value', function (require, exports, module) {
    'use strict';
    module.exports = function defineLazyValue(obj, prop, initializer, writable) {
        Object.defineProperty(obj, prop, {
            configurable: true,
            get: function () {
                Object.defineProperty(this, prop, {
                    value: undefined,
                    writable: true
                });
                var value = initializer.call(this, obj, prop);
                Object.defineProperty(this, prop, {
                    value: value,
                    writable: !!writable
                });
                return value;
            },
            set: function (value) {
                Object.defineProperty(this, prop, {
                    value: value,
                    writable: !!writable
                });
                return value;
            }
        });
    };
});