What is a recursive type in TypeScript and how is it used

A recursive type in TypeScript is a type that refers to itself in its definition. Recursive types are useful for defining data structures that contain references to other instances of the same data structure, such as linked lists, trees, and graphs.

Here's an example of defining a recursive type for a binary tree:

type TreeNode<T> = {
  value: T;
  left: TreeNode<T> | null;
  right: TreeNode<T> | null;
};
In this example, the TreeNode type refers to itself in the definition of its left and right properties. This allows us to define binary trees that contain references to other binary trees.