node.js singleton example in typescript

Logger.ts

class Logger {

  public error(msg: string, exception: Error): void {
    console.error(msg, exception);
  }
}

const instance = new Logger();

// Prevent modification to properties and values of the object.
Object.freeze(instance);

// node.js module based singleton
export { instance as MyLogger };

// Usage:
//
// import { MyLogger } from './Logger';
// MyLogger.error('Error message', new Error('My Error message'));