“use strict”;

module.exports.mixin = function mixin(target, source) {

const keys = Object.getOwnPropertyNames(source);
for (let i = 0; i < keys.length; ++i) {
  Object.defineProperty(target, keys[i], Object.getOwnPropertyDescriptor(source, keys[i]));
}

};

module.exports.wrapperSymbol = Symbol(“wrapper”); module.exports.implSymbol = Symbol(“impl”);

module.exports.wrapperForImpl = function (impl) {

return impl[module.exports.wrapperSymbol];

};

module.exports.implForWrapper = function (wrapper) {

return wrapper[module.exports.implSymbol];

};