'use strict';

// Closure: class factory

const createServerClass = (dependencies) => {

class Server {

constructor() {

const { Logger } = dependencies;

this.logger = new Logger();

}

shutdown() {

this.logger.log('Shutting down...');

}

}

return Server;

};

// Usage

class Logger {

constructor() {

return console;

}

}

const Server = createServerClass({ Logger });

const server = new Server();

server.shutdown();

console.log('Bye!');