開始第一個 React App

初始化 npm

$ npm init

安裝 webpack、babel、react 相關套件

$ npm i --save-dev webpack webpack-cli

$ npm i --save react react-dom

$ npm i --save-dev babel-loader @babel/core

$ npm i --save-dev @babel/preset-env @babel/preset-react

設定檔

webpack.config.js

const path = require("path");

module.exports = {
  mode: "development",
  entry: "./src/index.js",
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        loader: "babel-loader",
      },
    ],
  },
  output: {
    filename: "index.js",
    path: path.resolve(__dirname, "dist"),
  },
};

.babelrc

{
  "presets": ["@babel/preset-env", "@babel/preset-react"]
}

開始寫第一個 react app

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
  </head>
  <body>
    <div id="root"></div>
    <script src="./dist/index.js"></script>
  </body>
</html>

src/index.js

import React from "react";
import ReactDOM from "react-dom";

class App extends React.Component {
  render() {
    return <div>hello world</div>;
  }
}

ReactDOM.render(<App />, document.getElementById("root"));

編譯

使用 npx
```
$ npx webpack
```

或是在 package.json 新增 script

{
  "name": "react-test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "webpack",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@babel/core": "^7.6.0",
    "@babel/preset-env": "^7.6.0",
    "@babel/preset-react": "^7.0.0",
    "babel-loader": "^8.0.6",
    "webpack": "^4.40.2",
    "webpack-cli": "^3.3.9"
  },
  "dependencies": {
    "react": "^16.9.0",
    "react-dom": "^16.9.0"
  }
}

$ npm start

開始第一個 React App

初始化 npm

安裝 webpack、babel、react 相關套件

設定檔

開始寫第一個 react app

編譯

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