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

## Hover to discover the type of native browser elements and functions

TypeScript types do exist for native browser elements like `span`, `div`, and `input`. Types already exist for native browser functions like `fetch` as well. But what are the types of these elements and functions? Well, if we are using Visual Studio Code, then we can hover over where the item is referenced, and a tooltip will show us the type information!

## Use strict mode

We'll get the most benefit out of TypeScript if strict mode is on. It is particularly useful in helping us avoid the `any` type and `null` reference problems.

Strict mode is turned on in the following `tsconfig.json` setting:

```
{
  "compilerOptions": {
    "strict": true,
    ...
  },
  ...
}
```

We might think going straight to strict mode would be challenging when migrating an existing codebase from JavaScript to TypeScript. However, the `allowJs` setting allows a mixed JavaScript and TypeScript codebase, so the whole code doesn't need to be migrated before it compiles.

# Hover to discover the type of native browser elements and functions

TypeScript types do exist for native browser elements like `span`, `div`, and `input`. Types already exist for native browser functions like `fetch` as well. But what are the types of these elements and functions? Well, if we are using Visual Studio Code, then we can hover over where the item is referenced, and a tooltip will show us the type information!

# Use strict mode

We'll get the most benefit out of TypeScript if strict mode is on. It is particularly useful in helping us avoid the `any` type and `null` reference problems.

Strict mode is turned on in the following `tsconfig.json` setting:

```
{
  "compilerOptions": {
    "strict": true,
    ...
  },
  ...
}
```

We might think going straight to strict mode would be challenging when migrating an existing codebase from JavaScript to TypeScript. However, the `allowJs` setting allows a mixed JavaScript and TypeScript codebase, so the whole code doesn't need to be migrated before it compiles.

This lesson details six tips that will help you use TypeScript alongside React to build your apps.

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

Tips