Recursive Types

Recursive Type Definitions

Used for hierarchical data like trees or linked structures.

type TreeNode<T> = {
  value: T;
  children?: TreeNode<T>[];
};

const root: TreeNode<string> = {
  value: "root",
  children: [{ value: "child" }]
};

JSON Recursive Types

When encoding/decoding JSON, recursive types help keep type safety.

interface Comment {
  id: number;
  text: string;
  replies?: Comment[]; // recursive reference
}