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resource-hint-webpack-plugin

v1.2.1

Published

webpack 脚本加载插件

Downloads

66

Readme

Build Status version downloads MIT License PRs Welcome

Watch on GitHub Star on GitHub

简介

resource-hint-webpack-plugin 集成了 Resource Hints 的能力,能够在打包时自动添加 link 标签到 html 中。

基于 @vuejs/preload-webpack-plugin,强化了配置功能 options,并且新增支持 dns-prefetch / prerender / preconnect 的能力。

<link href="src_async_js.f23b5bce.js" rel="preload" as="script">
<link href="https://example.com/fonts/font.woff" rel="preload" as="font" crossorigin>
<link href="src_async_js.f23b5bce.js" rel="prefetch">
<link href="//fonts.googleapis.com" rel="dns-prefetch">
<link href="https://www.keycdn.com" rel="prerender" >
<link href="https://cdn.domain.com" rel="preconnect" crossorigin>

内容列表

预检查

确保 webpack 的版本在 5 以上,并且正在使用 html-webpack-plugin

const HtmlWebpackPlugin = require('html-webpack-plugin');
const { ResourceHintWebpackPlugin } = require('resource-hint-webpack-plugin');

module.exports = {
  /* ... */
  plugins: [
    new HtmlWebpackPlugin({
      template: './public/index.html',
      filename: 'index.html',
      chunks: ['index'],
      inject: 'body'
    }),
    new ResourceHintWebpackPlugin([{
      rel: 'preload',
      include: {
        type: 'asyncChunks',
      }
    }])
  ]
  /* ... */
}

安装

通过 npm 安装,并将其添加到开发时依赖中 devDependencies:

npm install resource-hint-webpack-plugin --save-dev

或者

通过 yarn 安装:

yarn add resource-hint-webpack-plugin --dev

配置项

配置项改造成了一个数组,支持传入多个 options,下面是单个的配置项:

|字段名|类型|默认值|描述| |:---:|:-:|:---:|:--| |rel|{String}|-|脚本的预加载模式| |include|{{IncludeOption}}|-|指定需要预加载的脚本|

Hints

preload

preload 允许预加载在 CSS 和 JavaScript 中定义的资源,并允许决定何时应用每个资源,需要配合 webpack 懒加载

new ResourceHintWebpackPlugin([{
  rel: 'preload',
  include: {
    type: 'asyncChunks',
  }
}])

prefetch

prefetch 是一个低优先级的资源提示,允许浏览器在后台(空闲时)获取将来可能用得到的资源,并且将他们存储在浏览器的缓存中。

new ResourceHintWebpackPlugin([{
  rel: 'prefetch',
  include: {
    type: 'asyncChunks'
  }
}])

dns-prefetch

dns-prefetch 允许浏览器在用户浏览页面时在后台运行 DNS 的解析。

new ResourceHintWebpackPlugin([{
  rel: 'dns-prefetch',
  include: {
    hosts: ['//fonts.googleapis.com']
  }
}])

prerender

prerender 优化了可能导航到的下一页上的资源的加载,在后台渲染了整个页面和整个页面所有的资源。

要小心的使用 prerender,因为它将会加载很多资源并且可能造成带宽的浪费,尤其是在移动设备上,并且可能会造成一些副作用

new ResourceHintWebpackPlugin([{
  rel: 'prerender',
  include: {
    hosts: ['https://www.keycdn.com']
  }
}])

preconnect

preconnect 允许浏览器在一个 HTTP 请求正式发给服务器前预先执行一些操作,这包括 DNS 解析,TLS 协商,TCP 握手,这消除了往返延迟并为用户节省了时间。

new ResourceHintWebpackPlugin([{
  rel: 'preconnect',
  include: {
    hosts: ['https://cdn.domain.com']
  }
}])

进阶用法

指定 chunk 和 entry

在使用 prefetchpreload 时,可以指定 chunks 或者 entries 的值来确定需要生成 link 的页面。

module.exports = {
  output: {
    filename: '[name].[contenthash:8].js',
    path: path.resolve(__dirname, 'dist')
  }
  plugins: [
    //...
    new ResourceHintWebpackPlugin([{
      rel: 'preload', // 或者 prefetch
      include: {
        chunks: ['index']
      }
    }])
  ]
}
module.exports = {
  entry: {
    index: './src/index.js',
    index2: './src/index2.js'
  },
  plugins: [
    //...
    new ResourceHintWebpackPlugin([{
      rel: 'preload', // 或者 prefetch
      include: {
        entries: ['index2']
      }
    }])
  ]
}

指定 htmls

所有的 hints 支持指定 htmls

new ResourceHintWebpackPlugin([{
  rel: 'dns-prefetch', // prerender, preconnect, preload, prefetch
  include: {
    htmls: ['index.html']
  }
}])

批量添加

本插件增强了 options 的能力,能够同时插入不同的 hints

new ResourceHintWebpackPlugin(
  [
    {
      rel: 'preload',
      include: {
        type: 'asyncChunks'
      }
    },
    {
      rel: 'dns-prefetch',
      include: {
        hosts: ['//fonts.googleapis.com']
      }
    },
    {
      rel: 'prerender',
      include: {
        hosts: ['https://www.keycdn.com']
      }
    },
    {
      rel: 'preconnect',
      include: {
        hosts: ['https://cdn.domain.com']
      }
    }
  ]
)