source: imaps-frontend/node_modules/define-properties/index.js@ d565449

'use strict';

var keys = require('object-keys');
var hasSymbols = typeof Symbol === 'function' && typeof Symbol('foo') === 'symbol';

var toStr = Object.prototype.toString;
var concat = Array.prototype.concat;
var defineDataProperty = require('define-data-property');

var isFunction = function (fn) {
        return typeof fn === 'function' && toStr.call(fn) === '[object Function]';
};

var supportsDescriptors = require('has-property-descriptors')();

var defineProperty = function (object, name, value, predicate) {
        if (name in object) {
                if (predicate === true) {
                        if (object[name] === value) {
                                return;
                        }
                } else if (!isFunction(predicate) || !predicate()) {
                        return;
                }
        }

        if (supportsDescriptors) {
                defineDataProperty(object, name, value, true);
        } else {
                defineDataProperty(object, name, value);
        }
};

var defineProperties = function (object, map) {
        var predicates = arguments.length > 2 ? arguments[2] : {};
        var props = keys(map);
        if (hasSymbols) {
                props = concat.call(props, Object.getOwnPropertySymbols(map));
        }
        for (var i = 0; i < props.length; i += 1) {
                defineProperty(object, props[i], map[props[i]], predicates[props[i]]);
        }
};

defineProperties.supportsDescriptors = !!supportsDescriptors;

module.exports = defineProperties;