.

node_modules/define-properties/index.js

@@ -0,0 +1,58 @@
+'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 origDefineProperty = Object.defineProperty;
+
+var isFunction = function (fn) {
+	return typeof fn === 'function' && toStr.call(fn) === '[object Function]';
+};
+
+var arePropertyDescriptorsSupported = function () {
+	var obj = {};
+	try {
+		origDefineProperty(obj, 'x', { enumerable: false, value: obj });
+		// eslint-disable-next-line no-unused-vars, no-restricted-syntax
+		for (var _ in obj) { // jscs:ignore disallowUnusedVariables
+			return false;
+		}
+		return obj.x === obj;
+	} catch (e) { /* this is IE 8. */
+		return false;
+	}
+};
+var supportsDescriptors = origDefineProperty && arePropertyDescriptorsSupported();
+
+var defineProperty = function (object, name, value, predicate) {
+	if (name in object && (!isFunction(predicate) || !predicate())) {
+		return;
+	}
+	if (supportsDescriptors) {
+		origDefineProperty(object, name, {
+			configurable: true,
+			enumerable: false,
+			value: value,
+			writable: true
+		});
+	} else {
+		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;