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

You can't use `createRef` in class components.

There is no need to pass the type to `createRef` because TypeScript will infer it correctly.

The wrong type has been passed into `createRef`. The type should be `HTMLDivElement`.

We want to get a reference to a `div` element in a class component and have made an attempt at this below:

```
class SomeComponent extends React.Component {
 private div = React.createRef<HTMLSpanElement>();

 ...
 
 render() {
 return <div ref={this.div}>...</div>;
 }
}
```

What is the problem with this code?

We want to get a reference to a <code>div</code> element in a class component and have made an attempt at this below:
<pre><code>class SomeComponent extends React.Component {
 private div = React.createRef&lt;HTMLSpanElement&gt;();

 ...
 
 render() {
 return &lt;div ref={this.div}&gt;...&lt;/div&gt;;
 }
}
</code></pre>
What is the problem with this code?

What is the type of `currentDiv` in the code snipet below?

```
const div = React.useRef<HTMLDivElement>(null);
const currentDiv = div.current;
```

What is the type of <code>currentDiv</code> in the code snipet below?
<pre><code>const div = React.useRef&lt;HTMLDivElement&gt;(null);
const currentDiv = div.current;
</code></pre>

What is the type of `currentDiv` in the code snipet below?

```
const div = React.useRef<HTMLDivElement>();
const currentDiv = div.current;
```

What is the type of <code>currentDiv</code> in the code snipet below?
<pre><code>const div = React.useRef&lt;HTMLDivElement&gt;();
const currentDiv = div.current;
</code></pre>

Creating strongly-typed refs

Creating strongly-typed refs

This quiz will test your knowledge on working with React refs with TypeScript.

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

Quiz