myapp/node_modules/parse5/lib/utils/mixin.js

'use strict';

var Mixin = module.exports = function (host) {
    var originalMethods = {},
        overriddenMethods = this._getOverriddenMethods(this, originalMethods);

    Object.keys(overriddenMethods).forEach(function (key) {
        if (typeof overriddenMethods[key] === 'function') {
            originalMethods[key] = host[key];
            host[key] = overriddenMethods[key];
        }
    });
};

Mixin.prototype._getOverriddenMethods = function () {
    throw new Error('Not implemented');
};