Typescript Programming Tutorials, Guides & Best Practices

type Point = {
  x: number;
  y: number;
};

interface Circle {
  radius: number;
  center: Point;
}

Mapped types allow you to create new types by transforming properties of existing types. This is particularly useful when you need to apply the same transformation to multiple properties.

TypeScript is a powerful extension of JavaScript that adds static typing to your code, helping to catch errors early and improve overall code quality. One of the most powerful features of TypeScript is its support for generics and advanced types. These tools allow you to create more flexible, reusable, and type-safe code. In this cheatsheet, we’ll explore TypeScript’s generics and advanced types, helping you master complex type systems and take your TypeScript skills to the next level.

Generics are a way to create components or functions that can work with any data type while still maintaining type safety. This is particularly useful for creating reusable code.

VS Code extensions often start by adding new commands. Let’s create a simple command that displays a message when executed.

In the src/extension.ts file, you'll see that a sample command has already been registered. We’ll modify it to create our own custom command:

TypeScript is commonly used with React to ensure type safety in components:

import React from "react";

interface ButtonProps {
  label: string;
  onClick: () => void;
}

const Button: React.FC<ButtonProps> = ({ label, onClick }) => (
  <button onClick={onClick}>{label}</button>
);

export default Button;

• Leverage Type Definitions: Many JavaScript libraries already have TypeScript type definitions available via the DefinitelyTyped project. You can install these types using npm:

  npm install --save-dev @types/library-name