--- /dev/null
+module.exports = Object.setPrototypeOf || ({__proto__:[]} instanceof Array ? setProtoOf : mixinProperties);
+
+function setProtoOf(obj, proto) {
+ obj.__proto__ = proto;
+ return obj;
+}
+
+function mixinProperties(obj, proto) {
+ for (var prop in proto) {
+ if (!obj.hasOwnProperty(prop)) {
+ obj[prop] = proto[prop];
+ }
+ }
+ return obj;
+}