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happy-dev-server

v1.4.0-beta.0

Published

无需配置就能能导入 js、css、image 等文件的静态服务器

Downloads

4

Readme

happy-dev-server

无需配置就能导入 js、css、image 等文件的静态服务器。

目前支持的功能有:

  • 支持命令行,支持根目录配置文件 happy.config.js
  • 支持 https、http2 协议,支持代理,支持自定义请求,支持监听文件改动自动刷新浏览器。
  • 支持 import {} from '@/index' -> import {} from '/src/index' 路径别名。
  • js、ts、json、vue、jsx、tsx 文件引入扩展名省略,如 import {} from './src/index
  • 支持导入 js、css、图片、json、ts、less、scss、vue、jsx、tsx 文件。
  • 支持 html 注入环境变量,如 <script src="<%= static %>index.js"></script>

使用

npm i happy-dev-server -g

命令行调用

// 项目的根目录下
happy-dev-server -w

-w 为监听根目录下的文件变化,从而通知浏览器刷新

命令行调用的情况下根目录应有一个 public 文件夹用于存放静态资源(examples文件夹有详细示例)。

root
|---> public
|       |---> index.html
|
|---> src
        |---> index.js、.ts、.css、...、.vue

api 调用

import HappyDevServer from 'happy-dev-server'

new HappyDevServer({
    watch: true
}).start()

配置参数

api配置参数

watch

可选值: true | false 默认值: false

是否开启监听模式,为 true 时开启监听模式,监听文件变动从而刷新浏览器。

port

可选值: number 默认值: 1234

指定监听的端口。

static

可选值: string 默认值: /static/

指定服务器托管静态资源的路径。

contentBase

可选值: string 默认值: rootPath + '/public'

指定服务器要托管的静态资源目录。

https

可选值: true | false | https 默认值: false

是否开启 https 服务,为 true 时或者指定 https 证书路径则开启 https 服务。

http2

可选值: true | false 默认值: false

是否开启 http2 服务,为 true 时则开启 http2 服务。

setup

可选值: (app: Express) => void 默认值: undefined

获取 Express 实例,可以劫持请求做一些数据模拟等。

extensions

可选值: Extensions 默认值: ['.js', '.ts', '.vue', '.jsx', '.tsx', '.json']

文件后缀省略配置项,若 happy-dev-server 找不到对应路径的文件时会尝试拼接后缀继续查找。

alias

可选值: Alias 默认值: { '@': 'src' }

路径前缀别名,若路径前缀能匹配上则会替换为对应值。

proxy

可选值: { [path: string]: ProxyOptions } 默认值: {}

代理配置,其中 ProxyOptions 为第三方库 http-proxy-middlewareOptions 配置项。

type https = {
    key: Buffer
    cert: Buffer
}

interface ServerOptions {
    port?: number
    https?: https | boolean
    http2?: boolean
    static?: string
    contentBase?: string
}

interface Alias {
    [k: string]: string
}

type Extensions = string[]

export interface HappyDevServerOptions extends ServerOptions {
    watch?: boolean
    setup?: (app: Express) => void
    extensions?: Extensions
    alias?: Alias
    proxy?: { [path: string]: ProxyOptions }
}


const defaultOptions: Required<HappyDevServerOptions> = {
    port: 1234,
    https: false,
    http2: false,
    static: '/static/',
    contentBase: rootPath + '/public',
    watch: false,
    setup: undefined,
    extensions: ['.js', '.ts', '.vue', '.jsx', '.tsx', '.json'],
    alias: { '@': 'src' },
    proxy: {}
}

命令行配置参数

happy-dev-server -w -p 8000 -hs key+5-key.pem cert+5.pem

Usage: happy-dev-server [options]

Options:
  -v, --version               output the version number
  -c, --config [filename]     指定配置文件 (default: "happy.config.js")
  -w, --watch                 监听文件变动,从而刷新浏览器
  -p, --port <number>         指定端口号
  -s, --static <path>         指定静态目录存放路径
  -hs, --https [filePath...]  指定开启https协议,需提供 key 和 cert 路径,若不提供参数则会自动生成自签名证书
  -h2, --http2                指定开启http2协议
  -h, --help                  display help for command

功能

往 html 注入环境变量

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="box"></div>
    <img id="test" alt="">
    <!-- <%= static %> 为配置参数中的 static 值 -->
    <script type="module" src="<%= static %>index.js">
</body>

</html>

劫持除 public 文件夹外的文件,使之可以加载 css、image 等文件

// root/src/index.js
import './index.css'
import image from './image.png'

console.log(image) // this base64

还可以加载第三方模块

npm i vue element-plus -S
//////////////////////////////////
// root/src/index.js
import { createApp } from 'vue'
import Elm from 'element-plus'
import 'element-plus/dist/index.css'

原理

happy-dev-server 通过拦截请求处理各类文件,统一返回 javascript 格式。

对于第三方模块的加载 happy-dev-server 会查找 package.json 中的 dependencies,并对其进行打包,通过改写 import 中的地址来完成加载。

happy-dev-server 只拦截通过 script 引入的文件,对于诸如 linkimg srciframecss @import 等方式的引入将原封不动地返回文件内容。

例如:

/**
 * 加载 root/src/index.js, 解析到以下语法
 */
import Elm from 'element-plus'

// 识别为第三方模块,打包到 node_modules/.happy-dev-server 目录下,并改写 import 语句

// --->
import Elm from '/node_modules/.happy-dev-server/element-plus{version}.js'

对于第三方模块静态文件的支持,直接改写路径到对应的静态文件目录

import 'element-plus/dist/index.css'

// --->
import '/node_modules/element-plus/dist/index.css'