3 module.exports.mixin = function mixin(target, source) {
4 const keys = Object.getOwnPropertyNames(source);
5 for (let i = 0; i < keys.length; ++i) {
6 Object.defineProperty(target, keys[i], Object.getOwnPropertyDescriptor(source, keys[i]));
10 module.exports.wrapperSymbol = Symbol("wrapper");
11 module.exports.implSymbol = Symbol("impl");
13 module.exports.wrapperForImpl = function (impl) {
14 return impl[module.exports.wrapperSymbol];
17 module.exports.implForWrapper = function (wrapper) {
18 return wrapper[module.exports.implSymbol];