Parcel 打包示例 - React HelloWorld-白红宇

使用打包的 React HelloWorld 应用。GitHub 地址:

0. 新建目录

mkdir react-helloworldcd react-helloworld复制代码

1. 初始化 npm

yarn init -y复制代码

或

npm init -y复制代码

此时会创建要给 package.json 文件，文件内容：

{  "name": "parcel-example-react-helloworld",  "version": "1.0.0",  "description": "",  "main": "index.js",  "scripts": {    "test": "echo \"Error: no test specified\" && exit 1"  },  "keywords": [],  "author": "",  "license": "ISC"}复制代码

2. 添加 React

yarn：

yarn add react react-dom复制代码

npm:

npm install react react-dom --save复制代码

package.json 文件内容：

{   "name": "parcel-example-react-helloworld",   "version": "1.0.0",   "description": "",   "main": "index.js",   "scripts": {     "test": "echo \"Error: no test specified\" && exit 1"   },   "keywords": [],   "author": "",-  "license": "ISC"+  "license": "ISC",+  "dependencies": {
    +    "react": "^16.2.0",+    "react-dom": "^16.2.0"+  } }复制代码

3. 添加 Babel

新建 .babelrc 文件

touch .babelrc复制代码

输入内容：

{  "presets": ["react"]}复制代码

添加 babel-preset-react：

yarn：

yarn add babel-preset-react -D复制代码

npm:

npm install babel-preset-react --D复制代码

此时 package.json 文件内容：

{   "name": "parcel-example-react-helloworld",   "version": "1.0.0",   "description": "",   "main": "index.js",   "scripts": {     "test": "echo \"Error: no test specified\" && exit 1"   },   "keywords": [],   "author": "",   "license": "ISC",   "dependencies": {     "react": "^16.2.0",     "react-dom": "^16.2.0"-   }+   },+   "devDependencies": {
    +     "babel-preset-react": "^6.24.1"+   } }复制代码

5. 添加 Parcel

yarn：

yarn add parcel-bundler -D复制代码

npm:

npm install parcel-bundler --D复制代码

此时 package.json 文件内容：

{   "name": "parcel-example-react-helloworld",   "version": "1.0.0",   "description": "",   "main": "index.js",   "scripts": {     "test": "echo \"Error: no test specified\" && exit 1"   },   "keywords": [],   "author": "",   "license": "ISC",   "dependencies": {     "react": "^16.2.0",     "react-dom": "^16.2.0"    },    "devDependencies": {-      "babel-preset-react": "^6.24.1"+      "babel-preset-react": "^6.24.1",+      "parcel-bundler": "^1.0.3"        } }复制代码

6. 新建 index.html 文件

内容

    
    
    复制代码

7. 新建 index.js 文件

import React from "react";import ReactDOM from "react-dom";const App = () => {  return Hello World!
;};ReactDOM.render(
    , document.getElementById("root"));复制代码

8. 添加打包命令

{   "name": "parcel-example-react-helloworld",   "version": "1.0.0",   "description": "",   "main": "index.js",   "scripts": {-    "test": "echo \"Error: no test specified\" && exit 1"+    "start": "parcel index.html"   },   "keywords": [],   "author": "",   "license": "ISC",   "dependencies": {     "react": "^16.2.0",     "react-dom": "^16.2.0"    },    "devDependencies": {       "babel-preset-react": "^6.24.1"       "babel-preset-react": "^6.24.1",       "parcel-bundler": "^1.0.3"        } }复制代码

9. 完成

运行

yarn start复制代码

或

npm start复制代码

在浏览器中打开

打包过程会生产 .cache 和 dist 两个目录，如果是 git 工程，可以新建 .gitignore 文件忽略这两个目录：

.cachedistnode_modules复制代码

GitHub 地址: