TypeScript: Difference between Type and Interface

Using React and TypeScript, the doubt about the difference between type and interface is common. In practice, many developers use them interchangeably, as in many scenarios the impact is minimal. Let's clarify the nuances:

1. Use:

type offers greater flexibility, acting as a type for types.

type Pessoa = {
  nome: string;
  idade: number;
};

A crucial advantage: type allows type unions, something that does not allow. interface

type Status = "sucesso" | "erro" | "carregando";
interface Status = "sucesso" | "erro" | "carregando"; // ❌ Erro

, in turn, it is ideal for defining the structure of objects and supports inheritance through interface, promoting code reuse. Defines a contract for an object. extends

interface Usuario {
  nome: string;
  idade: number;
}

2. Inheritance:

Allows multiple inheritance with interface. extends

interface Funcionario extends Pessoa {
  email: string;
}

Uses intersection (type) to combine types. &

type Funcionario = Pessoa & {
  email: string;
};

3. Which use?

Use
• When working with objects and need extensibility. interface
Use
• When you need types of type, intersections, functions or types of return of APIs. type

In short,

is usually preferable to objects, while interface offers greater flexibility for other situations. type

Thanks for your reading! Comments and interactions are welcome!

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