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

## Creating an inline anonymous event handler

We are going to finish the implementation of a `Searchbox` component to learn how to strongly-type event handlers. Click the link below to open the exercise in CodeSandbox:

[CodeSandbox project](https://codesandbox.io/s/react-ts-event-handlers-z0t52?fontsize=14)

The app contains an `input` that will eventually allow a user to enter some search criteria. At the moment, users can't type anything into the `input`.

Let's add an `onChange` event handler inline on the `input` that updates the `criteria` state:

```
<input
  type="text"
  value={criteria}
  onChange={e => setCriteria(e.currentTarget.value)}
/>
```

Notice that the editor provides IntelliSense on the `e` parameter. What is the type of `e`?

# Creating an inline anonymous event handler

We are going to finish the implementation of a `Searchbox` component to learn how to strongly-type event handlers. Click the link below to open the exercise in CodeSandbox:

[CodeSandbox project](https://codesandbox.io/s/react-ts-event-handlers-z0t52?fontsize=14)

The app contains an `input` that will eventually allow a user to enter some search criteria. At the moment, users can't type anything into the `input`.

Let's add an `onChange` event handler inline on the `input` that updates the `criteria` state:

```
<input
  type="text"
  value={criteria}
  onChange={e => setCriteria(e.currentTarget.value)}
/>
```

Notice that the editor provides IntelliSense on the `e` parameter. What is the type of `e`?

Interactive components need to handle events. In this lesson, we'll learn how to implement event handlers in a function component that has strongly-typed parameters. What we will learn also applies to class components as well.

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

Creating strongly-typed event handlers

Creating an inline anonymous event handler #