10 Best Practices for Mastering TypeScript

If you're a developer wanting to write more robust, maintainable, and scalable code, then TypeScript might be the programming language you've been looking for. With TypeScript, you can catch potential errors before they happen, allowing you to write more secure code. However, to get the most out of TypeScript and write high-quality projects, following best practices is essential.

In this article, we'll explore the top 20 best practices for mastering TypeScript, including emojis, quotes, code examples, and links to help you dive deeper into each topic.

1. Strict type checking 🕵️‍♂️

Strict type checking in TypeScript helps catch sneaky bugs that can make their way into your code and cause future problems. It's important to ensure that the types of your variables match the types you expect them to be, and this is easy to enable. Just add "strict": true to your tsconfig.json file.

let userName: string = "John";
userName = 123; // TypeScript will throw an error because "123" is not a string.

2. Type Inference 🤖

TypeScript is all about being explicit with your types, but that doesn't mean you have to spell everything out. Type inference is the TypeScript compiler's ability to automatically determine the type of a variable based on the value assigned to it.

let name = "John";

3. Linters 🧹

Linters are tools that can help you write better code by applying a set of rules and guidelines. They can help you catch potential bugs and improve the overall quality of your code. TSLint and ESLint are some of the linters available for TypeScript.

4. Interfaces 📑

Interfaces in TypeScript define a contract for the shape of an object. They specify the properties and methods an object of that type must have and can be used as a type for a variable. This helps ensure that the object is following the expected structure.

user interface {
   name: string;
   age: number;
   email: string;
}

function sendEmail(user: User) {
   // ...
}

const newUser = {
   name: "John",
   age: 30,
};

sendEmail(newUser); // TypeScript will throw an error because the "email" property is missing.

5. Types of Union 🤝

Union types in TypeScript allow a variable to have more than one type. This can be useful when you want a function to be able to accept different types of parameters.

function getUser(id: number | string) {
   // ...
}

See more at: https://tablognews.netlify.app/posts/post/5-melhores-praticas-para-dominar-o-typescript-1