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创建 package.json 文件
执行命令 npm init
创建 package.json 文件,一步步输入你自己的组件基本信息,下面是我创建的
{
"name": "react-code-previewer",
"version": "0.0.1",
"description": "基于 react 和 antd 的代码预览器组件",
"main": "index.js",
"scripts": {"test": "echo \"Error: no test specified\"&& exit 1"},
"repository": {
"type": "git",
"url": "git+ssh://git@github.com/zhangwei900808/react-code-previewer.git"
},
"keywords": [
"react",
"antd",
"code-preview"
],
"author": "zhangwei",
"license": "MIT",
"bugs": {"url": "https://github.com/zhangwei900808/react-code-previewer/issues"},
"homepage": "https://github.com/zhangwei900808/react-code-previewer#readme"
}
初始化组件
首先在项目目录下创建相应文件夹和基本配置文件,目录结构如下所示:
|-- com.github
|-- .editorconfig
|-- .gitignore
|-- .npmignore
|-- LICENSE
|-- package.json
|-- .react-code-previewer
|-- components
| |-- index.js
| |-- code-previewer
| |-- index.js
| |-- style
| |-- index.js
| |-- index.scss
|-- src
创建好之后,我们开始制作该组件,在目录 code-previewer/index.js 添加代码,如下所示:
import React, {Component} from "react";
class CodePreviewer extends Component {render() {
<div className="code-preview-container">
<div className="cp-component">
<div className="component-header">header</div>
<div className="component-content">content</div>
<div className="component-footer">footer</div>
</div>
<div className="cp-code">
<div className="code-header">code header</div>
<div className="code-tabs">code tabs</div>
<div className="code-content">code content</div>
</div>
</div>;
}
}
export default CodePreviewer;
在目录 code-previewer/style/index.js 添加代码,如下所示:
import "./index.scss";
在目录 code-previewer/style/index.scss 添加代码,如下所示:
.code-preview-container {
.cp-component {.component-header {}
.component-content {}
.component-footer {}}
.cp-code {.code-header {}
.code-tabs {}
.code-content {}}
}
我们现在已经初始化组件内容,虽然很简单,后面我们再优化,现在我们要对外暴露该组件,所以我们在目录 /components/index.js 添加代码,如下:
import CodePreview from "./code-previewer";
export {CodePreview};
export default {CodePreview};
umd 打包
首先我们在目录创建.react-code-preview/webpack.config.umd.js 文件,并添加如下代码:
const fs = require("fs");
const path = require("path");
const webpack = require("webpack");
const UglifyJsPlugin = require("uglifyjs-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const OptimizeCssAssetsPlugin = require("optimize-css-assets-webpack-plugin");
const nodeExternals = require("webpack-node-externals");
const WebpackMd5Hash = require("webpack-md5-hash");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const {CleanWebpackPlugin} = require("clean-webpack-plugin");
const resolve = dir => path.join(__dirname, ".", dir);
const isProd = process.env.NODE_ENV === "production";
const {version, name, description} = require("../package.json");
const distDir = path.join(process.cwd(), "dist");
module.exports = {
mode: "production",
entry: {[name]: "./components/index.js" },
output: {
path: distDir,
filename: "[name].min.js",
// 采用通用模块定义
libraryTarget: "umd",
library: name
},
devtool: "#source-map",
module: {
rules: [
{test: /\.(js|jsx)$/,
exclude: /node_modules/,
use: {loader: "babel-loader"}
},
{test: /\.(sa|sc|c)ss$/,
use: [
MiniCssExtractPlugin.loader,
{
loader: "css-loader",
options: {sourceMap: true}
},
{
loader: "sass-loader",
options: {sourceMap: true}
}
]
}
]
},
resolve: {
enforceExtension: false,
extensions: [".js", ".jsx", ".json", ".less", ".css"]
},
// 注意:本地预览的时候要注释,否则报 require undefined
// https://stackoverflow.com/questions/45818937/webpack-uncaught-referenceerror-require-is-not-defined
externals: [nodeExternals()],
plugins: [
new CleanWebpackPlugin({cleanOnceBeforeBuildPatterns: [distDir]
}),
new MiniCssExtractPlugin({filename: "[name].css"
}),
new WebpackMd5Hash(),
new webpack.BannerPlugin(` \n ${name} v${version} \n ${description} ${fs.readFileSync(path.join(process.cwd(), "LICENSE"))}`)
],
// 压缩 js
optimization: {
splitChunks: {
cacheGroups: {
styles: {
name: "styles",
test: /\.scss$/,
chunks: "all",
enforce: true
}
}
},
minimizer: [
new UglifyJsPlugin({
cache: true,
parallel: true,
sourceMap: true
}),
new OptimizeCssAssetsPlugin({assetNameRegExp: /\.css\.*(?!.*map)/g, // 注意不要写成 /\.css$/g
cssProcessor: require("cssnano"),
cssProcessorOptions: {discardComments: { removeAll: true},
safe: true,
autoprefixer: false
},
canPrint: true
})
]
},
node: {
setImmediate: false,
dgram: "empty",
fs: "empty",
net: "empty",
tls: "empty",
child_process: "empty"
}
};
在目录根目录下创建 .babelrc 文件,并添加如下代码:
{
"presets": [
["@babel/preset-env", {"modules": false,}], "@babel/preset-react"
],
"plugins": [
["@babel/plugin-transform-runtime", {"useESModules": false}]
]
}
创建完成之后添加依赖包,并修改 package.json 文件,如下:
"scripts": {"build:umd": "webpack --mode production --config .react-code-previewer/webpack.config.umd.js"},
"devDependencies": {
"@babel/cli": "^7.5.5",
"@babel/core": "^7.5.5",
"@babel/plugin-transform-runtime": "^7.5.5",
"@babel/preset-env": "^7.5.5",
"@babel/preset-react": "^7.0.0",
"@babel/runtime": "^7.5.5",
"babel-loader": "^8.0.6",
"clean-webpack-plugin": "^3.0.0",
"css-loader": "^3.2.0",
"fs": "^0.0.1-security",
"mini-css-extract-plugin": "^0.8.0",
"optimize-css-assets-webpack-plugin": "^5.0.3",
"path": "^0.12.7",
"react": "^16.9.0",
"sass-loader": "^7.2.0",
"style-loader": "^1.0.0",
"uglifyjs-webpack-plugin": "^2.2.0",
"webpack": "^4.39.2",
"webpack-cli": "^3.3.6",
"webpack-node-externals": "^1.7.2"
}
添加完成之后,执行命令打包
yarn build:umd
成功在 dist 目录下创建好了打包后的.js 文件,目录如下所示:
|-- com.github
|-- .babelrc
|-- .editorconfig
|-- .gitignore
|-- .npmignore
|-- LICENSE
|-- directoryList.md
|-- package.json
|-- yarn.lock
|-- .react-code-previewer
| |-- webpack.config.umd.js
|-- components
| |-- index.js
| |-- code-previewer
| |-- index.js
| |-- style
| |-- index.js
| |-- index.scss
|-- dist
| |-- react-code-previewer.min.js
| |-- react-code-previewer.min.js.map
|-- src
注意:因为后面组件会使用 bable-plugins-import 按需加载组件,所以上面的组件并没有直接引用.scss 文件,这样也就不会在 dist 文件夹下打包.css 文件了,但是.css 文件一定要有,后面会讲 gulp 如何打包.css 文件
commonjs 打包
上面讲了如何使用 webpack.config.umd.js 的 umd 模式打包 react 组件,接下来我们讲如何使用 commonjs 模式打包 react 组件,commonjs 模式打包我们使用的是 babel 直接打包,并且要修改.babelrc 和 package.json,如下:
.babelrc
{
"presets": [
["@babel/env", {
"loose": true,
"modules": "cjs"
}], "@babel/preset-react"
],
"plugins": [
["@babel/plugin-transform-runtime", {"useESModules": false}],
]
}
package.json
"build:commonjs": "babel components -d lib --source-maps"
添加完成之后,执行命令打包
yarn build:commonjs
|-- com.github
|-- .babelrc
|-- .editorconfig
|-- .gitignore
|-- .npmignore
|-- LICENSE
|-- directoryList.md
|-- package.json
|-- yarn.lock
|-- .react-code-previewer
| |-- webpack.config.umd.js
|-- components
| |-- index.js
| |-- code-previewer
| |-- index.js
| |-- style
| |-- index.js
| |-- index.scss
|-- dist
| |-- react-code-previewer.min.js
| |-- react-code-previewer.min.js.map
|-- lib
| |-- index.js
| |-- index.js.map
| |-- code-previewer
| |-- index.js
| |-- index.js.map
| |-- style
| |-- index.js
| |-- index.js.map
|-- src
es modules 打包
es modules 打包和 babel 打包很类似也是通过 babel 打包,不同的是.babelrc 文件有所修改,代码如下:
.babelrc
{
"presets": [
["@babel/env", {
"loose": true,
"modules": false
}], "@babel/preset-react"
],
"plugins": [
["@babel/plugin-transform-runtime", {"useESModules": true}]
]
}
package.json
"build:es": "babel components -d es --source-maps"
添加完成之后,执行命令打包
yarn build:es
![clipboard.png](/img/bVbwtk0)
![clipboard.png](/img/bVbwtlf)
|– react-code-previewer
|-- .babelrc
|-- .editorconfig
|-- .gitignore
|-- .npmignore
|-- LICENSE
|-- package.json
|-- yarn.lock
|-- .react-code-previewer
| |-- webpack.config.umd.js
|-- components
| |-- index.js
| |-- code-previewer
| |-- index.js
| |-- style
| |-- index.js
| |-- index.scss
|-- dist
| |-- react-code-previewer.min.js
| |-- react-code-previewer.min.js.map
|-- es
| |-- index.js
| |-- index.js.map
| |-- code-previewer
| |-- index.js
| |-- index.js.map
| |-- style
| |-- index.js
| |-- index.js.map
|-- lib
| |-- index.js
| |-- index.js.map
| |-- code-previewer
| |-- index.js
| |-- index.js.map
| |-- style
| |-- index.js
| |-- index.js.map
|-- src
这样就完成了 umd、commonjs 和 es 的三种打包方式,但是这样有个问题:每次打包都要修改.babelrc 文件,能不能直接通过一条命令打包三种模式的方法呢?下面我们就来讲讲。## 组合三种打包模式
通过三种打包模式我们发现,.babelrc 文件跟三种模式打包有关,尤其是其中几个对象的设置,如:loose、modules 和 useESModules,其它的设置都一样,所以我们可以使用 cross-env BABEL_ENV=umd(commonjs 或者 es)增加 BABEL_ENV 环境变量进行判断。还有,.babelrc 文件我们要换成.babelrc.js,因为前者不能使用 js 语法,这里 [有篇文章](https://www.babeljs.cn/docs/configuration) 很好的分析.babelrc、.babelrc.js 和 babel.config.js 文件之间的区别
## gulp 打包 css
## 组件按需加载
## 发布组件到 npm
## 发布组件到 github pages
## 使用组件
## 总结
1、js sourcemap
2、css sourcemap