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.markdown-body { line-height: 1.75; font-weight: 400; font-size: 15px; overflow-x: hidden; color: rgba(43, 43, 43, 1); font-family: -apple-system, system-ui, BlinkMacSystemFont, Helvetica Neue, PingFang SC, Hiragino Sans GB, Microsoft YaHei, Arial, sans-serif; background-image: linear-gradient(90deg, rgba(159, 219, 252, 0.15) 3%, rgba(0, 0, 0, 0) 0), linear-gradient(1turn, rgba(159, 219, 252, 0.15) 3%, rgba(0, 0, 0, 0) 0); background-size: 20px 20px; background-position: center }
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4, .markdown-body h5, .markdown-body h6 { padding: 30px 0; margin-top: 35px; margin-bottom: 10px; color: rgba(77, 208, 225, 1) }
.markdown-body h1 { font-size: 30px; text-align: center; position: relative; width: max-content; margin: 0 auto }
.markdown-body h1:before { position: absolute; content: ""; z-index: -1; top: -20px; height: 100%; width: 100px; left: 0; right: 0; margin: 0 auto; background: 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.markdown-body h1:after { position: absolute; content: ""; width: 150%; left: -25%; height: 50%; bottom: 12px; border-radius: 50%; background: linear-gradient(rgba(0, 0, 0, 0) 80%, rgba(77, 208, 225, 0.8)); opacity: 0.6; animation: 6s linear infinite h1animate }
@keyframes h1Animate { 0% { background-position: right bottom } 50% { background-position: right } 100% { background-position: right bottom } }
.markdown-body h2 { display: block; border-bottom: 4px solid rgba(77, 208, 225, 1); position: relative; font-size: 24px; padding: 12px 32px; margin: 30px 0 }
.markdown-body h2:before { width: 24px; height: 24px; left: 0; top: 0; margin: auto; background-size: 24px 24px; background-image: url("data:image/png;base64,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") }
.markdown-body h2:after, .markdown-body h2:before { content: ""; display: block; position: absolute; bottom: 0 }
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本文已参与「新人创作礼」活动,一起开启掘金创作之路。

在最近发布的Node v18.6.0中,带来了一个试验特性ESM Loader Hooks API。

如果他最终落地,很可能会成为改变前端工程化未来的特性。本文我们来聊聊他。

特性简介

用过webpack的朋友一定知道webpack中有个loader的概念,用于加载并处理不同类型文件,比如css-loaderurl-loader

loader的执行顺序取决于webpack内部对文件树解析、遍历的顺序。

今天要介绍的ESM Loader Hookswebpack loader类似,只不过对文件树的解析、遍历是由Node.js原生支持的ESM规范(而不是打包工具)确定的。

通过定义不同loader,就能在不使用工程化工具的前提下,对项目中各个ESM模块进行处理。

举个例子,在命令行通过--experimental-loader指令开启特性后,执行如下语句:

node --loader redirect.mjs app.mjs

其中,app.mjs待处理的源文件.mjs后缀指代该文件是个ESM模块(相对应的,.cjs后缀指CJS模块)。

--loader用于指定自定义的ESM Loader,这里指定的是redirect.mjsapp.mjs会交由redirect.mjs处理。

redirect.mjs代码如下:

// redirect.mjs
export function resolve(specifier, context, nextResolve) {
  let redirect = 'app.prod.mjs';   switch(process.env.NODE_ENV) {
    case 'development':
      redirect = 'app.dev.mjs';
      break;
    case 'test':
      redirect = 'app.test.mjs';
      break;
  }   return nextResolve(redirect);
}

redirect.mjs会根据Node当前所属环境改写文件的引入路径。

比如在开发环境(process.env.NODE_ENV === 'development'),app.mjs经由redirect.mjs处理,会重定向到app.dev.mjs

ESM Loader Hooks API中之所以带Hooks字眼,是因为每个自定义ESM Loader,都可以像钩子(Hooks)一样连接其他自定义ESM Loader(或者Node.js提供的默认ESM Loader)。

比如在如下语句中:

node --loader c.mjs --loader b.mjs --loader a.mjs app.mjs

app.mjs会依次经过a b c三个**「自定义ESM Loader」**处理。

整个过程就像一个promise.then链条(事实上,每个ESM loader确实会返回一个promise)。

实际例子

来看一个更接近日常开发的例子,考虑如下ESM模块:

// app.tsx
import ReactDOM from 'react-dom/client';
import {
  BrowserRouter,
  useRoutes,
} from 'react-router-dom'; import App from './AppHeader.tsx'; import routes from 'https://example.com/routes.json' assert { type: 'json' }; import './global.css' assert { type: 'css' }; const root = ReactDOM.createRoot(document.getElementById('root')); root.render(
  <BrowserRouter>
    <App />
    <main>{useRoutes(routes)}</main>
  </BrowserRouter>
);

其中包括很多Node.js不能处理的部分,比如:

  • TS语法(需要编译成JS,并处理文件描述符为Node.js可识别的形式)
  • JSX转换(需要编译成React.createElementjsxRuntime.jsx
  • 需要处理引入的CSS文件
  • 需要处理远程引入的模块(代码中引入routes的语句)

处理CSS文件

以处理CSS文件举例,假设CSS文件内容如下:

.Container {
  border: 1px solid black;
} .SomeInnerPiece {
  background-color: blue;
}

如果为了测试目的,仅需要生成类名对应快照即可,所以可以实现一个简易的CSS loader,处理输入的CSS文件,将结果输出为Node.js可执行的JSON格式:


  "Container": "Container", 
  "SomeInnerPiece": "SomeInnerPiece"
}

处理远程引入的模块

再以处理处理远程引入的模块举例。

当识别到https://开头的文件描述符(即import声明或import()表达式中字符串的部分)时, 可以利用https模块发起请求,返回请求对应promise

import { get } from 'https';

export function load(url, context, nextLoad) {
  if (url.startsWith('https://')) {
    return new Promise((resolve, reject) => {
      get(url, (res) => {
        let data = '';
        res.on('data', chunk => data += chunk);
        res.on('end', () => resolve({
          format: 'module',
          shortCircuit: true,
          source: data,
        }));
      }).on('error', err => reject(err));
    });
  }   return nextLoad(url, context);
}

总结

ESM Loader Hooks特性趋于稳定,配套的loader生态足够丰富后,很多原来需要打包工具才能实现的工程化需求都能用Node.js原生解决。

比如,要处理上述提到的app.tsx文件,只需执行如下命令:

node --loader typescript-loader --loader css-loader --loader network-loader app.tsx

你觉得这个特性对未来前端工程化会有多大影响呢?

参考资料

Loader Hooks API:

Custom ESM loaders: Who, what, when, where, why, how

CSS loader的简易实现

Https loader的简易实现

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