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

Is there a <code>Date</code> type in JavaScript?

Is there a <code>Date</code> type in TypeScript?

Is the type annotation necessary to type the `amount` variable to `number` in the declaration below?

```
let amount: number = 1000;
```

Is the type annotation necessary to type the <code>amount</code> variable to <code>number</code> in the declaration below?
<pre><code>let amount: number = 1000;
</code></pre>

Is the type annotation necessary to type the `message` parameter to `string` in the declaration below?

```
function logMessage(message: string) {
	...
}
```

Is the type annotation necessary to type the <code>message</code> parameter to <code>string</code> in the declaration below?
<pre><code>function logMessage(message: string) {
	...
}
</code></pre>

`message` is of type `string` and the return type is `void`

`message` is of type `any` and the return type is `void`

`message` is of type `string` and the return type is `never`

`message` is of type `any` and the return type is `never`

What is the type of the `message` parameter in the following function? What is the return type of the function?  

```
function outputMessage(message) {
	console.log(message);
}
```

What is the type of the <code>message</code> parameter in the following function? What is the return type of the function?
<pre><code>function outputMessage(message) {
	console.log(message);
}
</code></pre>

What is the type of the `total` variable below?

```
let total = calcTotal() as number;
```

What is the type of the <code>total</code> variable below?
<pre><code>let total = calcTotal() as number;
</code></pre>

What is the type of the `invalid` variable in the function below?

```
function outputMessage(message: string) {
    if (typeof message === "string") {
        console.log(message);
    } else {
        let invalid = message;
        console.error(invalid);
    }
}
```

What is the type of the <code>invalid</code> variable in the function below?
<pre><code>function outputMessage(message: string) {
 if (typeof message === &quot;string&quot;) {
 console.log(message);
 } else {
 let invalid = message;
 console.error(invalid);
 }
}
</code></pre>

Using basic types

Using basic types

Well done, that's another chapter complete!

In the next chapter, we will learn how to create our own TypeScript types.

This quiz will test what you have learned about basic types in 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