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

# Strongly-typing a render prop

An example of a function prop is a prop that allows the consumer of a component to control the rendering of part of a component. This is called a **render prop**.

Open the CodeSandbox project we were working on in the last lesson. Let's add a render prop to our `Hello` component to optionally allow the consumer to control how the message is rendered. The prop will be called `renderMessage,` and the `Hello` component will be as follows:

```
const Hello = ({
 who,
 renderMessage,
 message = "How are you?"
}: Props) => (
 <React.Fragment>
 
 Hello, {who.name}
 {who.friend && " my friend"}
 
 {message && (renderMessage ? renderMessage(message) : {message})}
 </React.Fragment>
);
```

An example consumption of `Hello` is as follows:

```
<Hello
 who={{ name: "Bob", friend: true }}
 message="Hey, how are you?"
 renderMessage={m => {m}}
/>
```

So, what should the definition of the `Props` type be now with the new `renderMessage` prop?

A prop can be a function. In this lesson, we'll learn how to strongly-type function props.

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 a function prop

Strongly-typing a render prop #