乐趣区

创建react应用一

jiezi

虽然已经有了 create-react-app 这种非常方便的工具，但是封装了太多，对于里面的一些细节不是很了解，所以很有必要手动创建。

创建项目目录 

mkdir react-project
cd react-project

初始化 package.json

yarn init

在填写回答的时候，entry point 写 app/main.js，其他问题全部回车即可 

~ yarn init
yarn init v1.12.3
question name (react-project):
question version (1.0.0):
question description:
question entry point (index.js): app/main.js
question repository url:
question author:
question license (MIT):
question private:
success Saved package.json
✨  Done in 16.91s.

安装依赖 

yarn add --dev webpack webpack-cli @babel/core @babel/preset-env @babel/preset-react html-webpack-plugin webpack-merge babel-loader
yarn add react react-dom prop-types

创建目录结构 

/---babel.config.js
+---app
|   \---main.js
|   \---index.html
+---build
|   \---webpack.config.base.js
|   \---webpack.config.dev.js
|   \---webpack.config.prod.jd

babel.config.js

module.exports = {
  "presets": [
    [
      "@babel/preset-env",
      {
        "useBuiltIns": "entry",
        "targets": {
          "browsers": ["cover 99.5% in CN"]
        }
      }
    ],
    "@babel/preset-react"
  ]
}

app/main.js

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

function App() {
    return (
        <div className="App">
            <h1>Hello World</h1>
        </div>
    );
}

const rootElement = document.getElementById("root");

ReactDOM.render(<App/>, rootElement);

app/index.html

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8"/>
    <title><%= htmlWebpackPlugin.options.title %></title>
</head>
<body>
<div id="root"></div>
</body>
</html>

build/webpack.config.base.js

"use strict";
var path = require("path");
var HtmlWebpackPlugin = require("html-webpack-plugin");

module.exports = {entry: path.resolve(__dirname, "../app/main.js"),
    output: {path: path.resolve(__dirname, "../dist"),
        filename: "bundle.js"
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /(node_modules|bower_components)/,
                use: {loader: "babel-loader"}
            }
        ]
    },
    plugins: [
        new HtmlWebpackPlugin({template: "app/index.html"})
    ]
};

build/webpack.config.dev.js

"use strict";
var baseWebpackConfig = require("./webpack.config.base");
var merge = require("webpack-merge");

module.exports = merge(baseWebpackConfig, {
    mode: "development",
    devtool: "source-map"
});

build/webpack.config.prod.js

"use strict";
var baseWebpackConfig = require("./webpack.config.base");
var merge = require("webpack-merge");
var path = require("path");

module.exports = merge(baseWebpackConfig, {
    mode: "production",
    output: {path: path.resolve(__dirname, "../dist"),
        filename: "bundle.[hash].js"
    }
});

package.json 里加 scripts

  "scripts": {
    "build:dev": "webpack --config build/webpack.config.dev.js",
    "build:prod": "webpack --config build/webpack.config.prod.js"
  }

编译代码

做完上面的所有步骤就可以执行编译命令了，yarn build:dev 或者 yarn build:prod

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