Type Aliases vs Interfaces

A Type Alias allows you to create a custom name for any data type, including primitive types, unions, tuples, and object shapes.

1. Defining Type Aliases (`type`)

// Primitive Type Alias
type ID = string | number;

// Object Type Alias
type Point = {
  x: number;
  y: number;
};

// Function Signature Type Alias
type Formatter = (input: string) => string;

2. Intersection Types (`&`)

Combine multiple types into a single type using the & operator:

type Timestamps = {
  createdAt: Date;
  updatedAt: Date;
};

type UserProfile = {
  id: number;
  name: string;
};

// Combined Type via Intersection
type FullUser = UserProfile & Timestamps;

Type Aliases vs Interfaces Comparison