如何将 Webpack 构建哈希注入应用程序代码

问题描述

我正在使用 Webpack 的 [hash] 来缓存破坏区域设置文件.但我还需要硬编码语言环境文件路径以从浏览器加载它.由于文件路径是用 [hash] 改变的，我需要注入这个值来获得正确的路径.

我不知道如何在配置中以编程方式获取 Webpack [hash] 值，以便我可以使用 WebpackDefinePlugin 注入它.

module.exports = (env) =>{返回 {条目:'app/main.js',输出: {文件名:'[名称].[哈希].js'}...插件: [新的 webpack.DefinePlugin({哈希:***???***})]}}

解决方案

如果您想将哈希转储到文件并加载到服务器代码中，您可以在 webpack.config 中定义以下插件.js:

const fs = require('fs');类元信息插件{构造函数(选项){this.options = { 文件名: 'meta.json', ...options };}应用(编译器){compiler.hooks.done.tap(this.constructor.name, stats => {常量元信息 = {//如有必要，添加任何其他信息哈希:stats.hash};const json = JSON.stringify(metaInfo);返回新的承诺((解决，拒绝)=> {fs.writeFile(this.options.filename, json, 'utf8', error => {如果(错误){拒绝(错误)；返回;}解决();});});});}}模块.出口 = {//... 你的 webpack 配置 ...插件: [//... 其他插件 ...新元信息插件({文件名:'dist/meta.json'})，]};

输出meta.json文件的示例内容:

{"hash":"64347f3b32969e10d80c"}

我刚刚为此创建了一个 dumpmeta-webpack-plugin 包插入.所以你可以改用它:

const { DumpMetaPlugin } = require('dumpmeta-webpack-plugin');模块.出口 = {...插件: [...新的 DumpMetaPlugin({文件名:'dist/meta.json',准备:统计=>({//添加您需要转储的任何其他信息哈希:stats.hash，})}),]}

有关 Stats 对象的所有可用属性，请参阅 Webpack 文档.>

I'm using Webpack's [hash] for cache busting locale files. But I also need to hard-code the locale file path to load it from browser. Since the file path is altered with [hash], I need to inject this value to get right path.

I don't know how can get Webpack [hash] value programmatically in config so I can inject it using WebpackDefinePlugin.

module.exports = (env) => {
  return {
   entry: 'app/main.js',
   output: {
      filename: '[name].[hash].js'
   }
   ...
   plugins: [
      new webpack.DefinePlugin({
         HASH: ***???***
      })
   ]
  }
}

解决方案

In case you want to dump the hash to a file and load it in your server's code, you can define the following plugin in your webpack.config.js:

const fs = require('fs');

class MetaInfoPlugin {
  constructor(options) {
    this.options = { filename: 'meta.json', ...options };
  }

  apply(compiler) {
    compiler.hooks.done.tap(this.constructor.name, stats => {
      const metaInfo = {
        // add any other information if necessary
        hash: stats.hash
      };
      const json = JSON.stringify(metaInfo);
      return new Promise((resolve, reject) => {
        fs.writeFile(this.options.filename, json, 'utf8', error => {
          if (error) {
            reject(error);
            return;
          }
          resolve();
        });
      });
    });
  }
}

module.exports = {
  // ... your webpack config ...

  plugins: [
    // ... other plugins ...

    new MetaInfoPlugin({ filename: 'dist/meta.json' }),
  ]
};

Example content of the output meta.json file:

{"hash":"64347f3b32969e10d80c"}

---

I've just created a dumpmeta-webpack-plugin package for this plugin. So you might use it instead:

const { DumpMetaPlugin } = require('dumpmeta-webpack-plugin');

module.exports = {
  ...

  plugins: [
    ...

    new DumpMetaPlugin({
      filename: 'dist/meta.json',
      prepare: stats => ({
        // add any other information you need to dump
        hash: stats.hash,
      })
    }),
  ]
}

Please refer to the Webpack documentation for all available properties of the Stats object.

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