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TypeScript with React

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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posted @ 2020-08-23 17:40  xgqfrms  阅读(149)  评论(2)    收藏  举报