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webpack-leedom-plugin

v1.0.0

Published

1.配置开发环境 思路:开发webpack插件,配置一个webpack项目,然后将插件运行,开发成功后,将插件文件打包发布。 1.1创建项目 ```$xslt mkdir webpack-plugin cd mkdir npm init ``` 1.2配置webpack,建立webpack.plugin.js ```$xslt const path = require("path");

Downloads

3

Readme

#实现一哥webpack plugin 1.配置开发环境
思路:开发webpack插件,配置一个webpack项目,然后将插件运行,开发成功后,将插件文件打包发布。
1.1创建项目

mkdir webpack-plugin
cd mkdir
npm init

1.2配置webpack,建立webpack.plugin.js

const path = require("path");

const PATHS = {
 lib: path.join(__dirname, "/index.js"),
 build: path.join(__dirname, "build"),
};

module.exports = {
 entry: {
 	lib: PATHS.lib,
 },
 output: {
 	path: PATHS.build,
 	filename: "[name].js",
 }
};

1.3 入口文件index.js

console.log('index')

1.4 package.json scripts

"scripts": {
    "build:plugin": "webpack --config webpack.plugin.js --mode production"
  }

2.编写插件文件
2.1src/demo-plugin.js


module.exports = class DemoPlugin {
	constructor() {
	}
	apply() {
           console.log('applying')
	    })
	}
}

2.2 webpack.plugin.js使用插件

const DemoPlugin = require("./src/demo-plugin.js");

module.exports = {
  ...
  // 引入 plugin
  plugins: [new DemoPlugin()],
};

运行npm run build:plugin,终端打印出applying,说明插件生效。

applying
Hash: 98c8997160aa995a58a4
Version: webpack 4.12.0
Time: 93ms
Built at: 2019-04-29 14:34:31
 Asset       Size  Chunks             Chunk Names
lib.js  956 bytes       0  [emitted]  lib
[0] ./index.js 26 bytes {0} [built]。

2.2 传参,在应用插件时,参数会传到constructor里

module.exports = class DemoPlugin {
    constructor(options) {
        this.options = options
    }
    apply() {
        console.log('apply', this.options)
    }
}

使用插件时传入参数

module.exports = {
    ...
    plugins: [new DemoPlugin({ name: 'demo' })],
}

运行npm run build:plugin,打印出传递的参数。
2.3理解webpack的compiler和compilation,在之前的 webpack plugin 基本结构中介绍,apply 函数能够用来访问 webpack 的核心。具体的做法是,apply 函数的参数为 compiler

module.exports = class DemoPlugin {
    constructor(options) {
        this.options = options
    }
    apply(compiler) {
        console.log(compiler)
    }
}

再次运行 npm run build:plugin,会发现终端上打印出了 compiler 的全部信息,其中 hooks 字段占了绝大部分。 对照着官方文档,你会发现每一个 hook 对应一个特定的阶段。 例如,emit 实践是在向输出目录发送资源之前执行。这样就可以通过监听 hook 来实现控制编译过程。

module.exports = class DemoPlugin {
    constructor(options) {
        this.options = options
    }
    apply(compiler) {
        compiler.plugin('emit', (compilation, next) => {
            console.log(compilation)

            next()
        })
    }
}

运行 npm run build:plugin 会显示出比以前更多的信息,因为编译对象包含webpack 遍历的整个依赖关系图。 你可以访问与此相关的所有内容,包括 entries, chunks, modules, assets等。 2.4 通过 Compilation 写入文件
可以通过 compilation 的 assets 对象来编写新的文件,或是修改已经创建的文件。为了更好地写入文件,我们引入一个 npm 包

npm install webpack-sources --save-dev
const { RawSource } = require("webpack-sources");

module.exports = class DemoPlugin {
    constructor(options) {
        this.options = options
    }
    apply(compiler) {
        const { name } = this.options;

        compiler.plugin('emit', (compilation, next) => {
            compilation.assets[name] = new RawSource("demo");

            next()
        })
    }
}

在终端运行 npm run build:plugin

Hash: 98c8997160aa995a58a4
Version: webpack 4.12.0
Time: 95ms
Built at: 2019-04-29 16:08:52
 Asset       Size  Chunks             Chunk Names
lib.js  956 bytes       0  [emitted]  lib
  demo    4 bytes          [emitted]
[0] ./index.js 26 bytes {0} [built]

在 Asset 那里一列内,出现了我们自定的 demo 文件。 3.打包插件发布 webpack.build.js