Design Patterns in Typescript: Singleton Pattern

Learn how to Easily Implement the Singleton Pattern in TypeScript

What is the Singleton Pattern?

The Singleton Design Pattern is one of the most accessible and popular design patterns. This Design Pattern solves two problems at the same time.

1. The Singleton Pattern helps you ensure that only one instance of a class exists. The most common reason you might want this is when you want to control access to a shared resource. There are plenty of classes where you might imagine it could get very confusing if there were different instances floating around your application.
2. Provide a global access point to some data. Since you expose the single instance as a static method it can be called globally across your code.

Use the Singleton Pattern when a class in your application should have a single instance available to all clients; for example, a single database object shared by different parts of your application.

The Singleton pattern disables all other means of creating objects of a class except for the special creation method (getInstance()). This method either creates a new object or returns an existing one if it has already been created.