Module - TypeScript

The Module Pattern is a way to encapsulate state and expose only a necessary interface. It’s commonly used to create self-contained units of code, preventing global namespace pollution and improving maintainability. This TypeScript example uses a simple object literal to create a module. The counter variable is private to the module, and only the increment and getCount methods are exposed through the returned object. This aligns with TypeScript’s preference for clear interfaces and encapsulation, leveraging object literals for concise module creation when full class structures aren’t needed.

// counter.ts

const counterModule = (function() {
  let counter = 0;

  return {
    increment: function() {
      counter++;
    },
    getCount: function() {
      return counter;
    }
  };
})();

export default counterModule;