Gain insights into integrating TypeScript with React to improve productivity. Learn about strongly-typed props, state, and events, and set up projects using Create React App, Webpack, and Babel.

If you are a React developer and want to build your React apps faster and more robustly, this course is for you. Learn to integrate TypeScript with React, boost your productivity, and create apps that are easier to maintain.

In this course, you will learn how to utilize TypeScript’s sophisticated type system to make React development faster and your code more readable. You will learn how to create component props, state, and events that are strongly-typed, allowing you to quickly understand what you can pass and helping you avoid mistakes.

Lastly, you will set up React projects with TypeScript. First, you will learn how to do this with the Create React App tool, then how to create a React and TypeScript project with Webpack and Babel.

Using TypeScript with React

One of the most beneficial parts of using TypeScript with React is the ability to have strongly-typed component props. This allows developers using the component to quickly understand what they can pass and helps them avoid making mistakes.

# Specifying a type for function component props

In this section, we will create a React `Hello` component that has a simple prop for who to say hello to. We will explore two different ways of strongly-typing the component props.

We are going to use CodeSandbox to explore this topic. So, let's open the CodeSandbox project by clicking the following link: 

[CodeSandbox exercise](https://codesandbox.io/s/react-ts-prop-no-type-zlyss)

Can you spot a problem with the `Hello` component at the moment? 

The problem is that `props` hasn't been given a type which means TypeScript will give it the `any` type. The project is set up so that implicit `any`'s aren't allowed.

## Using type annotations for `props`

React function components are just functions that take in a `props` parameter and return JSX. We have already learned how to strongly-type function parameters, so, let's use this knowledge:

- Let's start by adding a type annotation for the `props`:

```
const Hello = (props: { who: string }) => (
  <p>Hello, {props.who}</p>
);
```

We have defined a `who` prop that is a `string` and included this in the hello message. 

Notice that a type error is now raised where `Hello` is consumed:

In this lesson, we will learn how to create strongly-typed props for function components.

Why TypeScript?

Using basic types

Creating types

Working with generic types

Creating strongly-typed function component props

Creating strongly-typed function component state

Creating strongly-typed class components

Creating strongly-typed component events and event handlers

Creating strongly-typed context

Creating strongly-typed refs

Creating React projects with TypeScript using Create React App

Creating a React and TypeScript project manually

Putting everything together

Specifying a type for function component props

Specifying a type for function component props #