TypeScript with React
# Make a new directory
$ mkdir react-typescript
# Change to this directory within the terminal
$ cd react-typescript
# Initialise a new npm project with defaults
$ npm init -y
# Install React dependencies
$ npm install react react-dom
# Make index.html and App.tsx in src folder
$ mkdir src
$ cd src
$ touch index.html
$ touch App.tsx
# Open the directory in your favorite editor
$ code .
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>React + TypeScript</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<div id="main"></div>
<script src="./App.tsx"></script>
</body>
</html>
# Install Parcel to our DevDependencies
$ npm i parcel-bundler -D
# Install TypeScript
$ npm i typescript -D
# Install types for React and ReactDOM
$ npm i -D @types/react @types/react-dom
{
"name": "react-typescript",
"version": "1.0.0",
"description": "An example of how to use React and TypeScript with Parcel",
"scripts": {
"dev": "parcel src/index.html"
},
"keywords": [],
"author": "Paul Halliday",
"license": "MIT"
}
import * as React from 'react';
export default class Counter extends React.Component {
state = {
count: 0
};
increment = () => {
this.setState({
count: (this.state.count + 1)
});
};
decrement = () => {
this.setState({
count: (this.state.count - 1)
});
};
render () {
return (
<div>
<h1>{this.state.count}</h1>
<button onClick={this.increment}>Increment</button>
<button onClick={this.decrement}>Decrement</button>
</div>
);
}
}
import * as React from 'react';
import { render } from 'react-dom';
import Counter from './Counter';
render(<Counter />, document.getElementById('main'));
$ npm run dev
# open http://localhost:1234.
Create React App and TypeScript
$ create-react-app my-new-app --typescript
https://www.digitalocean.com/community/tutorials/react-create-react-app
https://facebook.github.io/create-react-app/docs/adding-typescript
Functional Components
https://www.digitalocean.com/community/tutorials/react-functional-components
import * as React from 'react';
const Count: React.FunctionComponent<{
count: number;
}> = (props) => {
return <h1>{props.count}</h1>;
};
export default Count;
interface Props {
count: number;
}
const Count: React.FunctionComponent<Props> = (props) => {
return <h1>{props.count}</h1>;
};
Class Components
import * as React from 'react';
import Count from './Count';
interface Props {}
interface State {
count: number;
};
export default class Counter extends React.Component<Props, State> {
state: State = {
count: 0
};
increment = () => {
this.setState({
count: (this.state.count + 1)
});
};
decrement = () => {
this.setState({
count: (this.state.count - 1)
});
};
render () {
return (
<div>
<Count count={this.state.count} />
<button onClick={this.increment}>Increment</button>
<button onClick={this.decrement}>Decrement</button>
</div>
);
}
}
Default Props
import * as React from 'react';
interface Props {
count?: number;
}
export default class Count extends React.Component<Props> {
static defaultProps: Props = {
count: 10
};
render () {
return <h1>{this.props.count}</h1>;
}
}
render () {
return (
<div>
<Count />
<button onClick={this.increment}>Increment</button>
<button onClick={this.decrement}>Decrement</button>
</div>
)
}
refs
https://www.digitalocean.com/community/tutorials/react-typescript-with-react
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