在角度上，使用WebPack 5模块联邦，我们如何能够公开远程使用的Workers？

Question

在我的配置中，我目前正在使用一个shell应用程序和一个遥控器，它们都是用角12.2.0编写的，而且我面临着一个我不知道如何解决的问题。

外壳webpack.config.js

​

const ModuleFederationPlugin = require("webpack/lib/container/ModuleFederationPlugin");
const mf = require("@angular-architects/module-federation/webpack");
const path = require("path");
const share = mf.share;

const sharedMappings = new mf.SharedMappings();
sharedMappings.register(
  path.join(__dirname, '../../tsconfig.json'),
  ['auth-lib']
);

module.exports = {
  output: {
    uniqueName: "portal",
    publicPath: "auto"
  },
  optimization: {
    runtimeChunk: false
  },
  resolve: {
    alias: {
      ...sharedMappings.getAliases(),
    }
  },
  plugins: [
    new ModuleFederationPlugin({

        // For hosts (please adjust)
        remotes: {
          "myremote": "myremote@http://localhost:4250/remoteEntry.js"
        },

        shared: share({
          "@angular/core": { singleton: true, strictVersion: true, requiredVersion: 'auto' },
          "@angular/common": { singleton: true, strictVersion: true, requiredVersion: 'auto' },
          "@angular/common/http": { singleton: true, strictVersion: true, requiredVersion: 'auto' },
          "@angular/router": { singleton: true, strictVersion: true, requiredVersion: 'auto' },

          ...sharedMappings.getDescriptors()
        })

    }),
    sharedMappings.getPlugin()
  ],
};

​

远程webpack.config.js

​

const ModuleFederationPlugin = require("webpack/lib/container/ModuleFederationPlugin");
const mf = require("@angular-architects/module-federation/webpack");
const path = require("path");
const share = mf.share;

const sharedMappings = new mf.SharedMappings();
sharedMappings.register(
  path.join(__dirname, 'tsconfig.json'),
  [/* mapped paths to share */]
);

module.exports = {
  output: {
    uniqueName: "interviews",
    publicPath: "auto"
  },
  optimization: {
    runtimeChunk: false
  },
  resolve: {
    alias: {
      ...sharedMappings.getAliases(),
    }
  },
  plugins: [
    new ModuleFederationPlugin({

        // For remotes (please adjust)
        name: "myremote",
        filename: "remoteEntry.js",
        exposes: {
            './Module': './src/app/myremote/myremote.module.ts'
        },

        shared: share({
          "@angular/core": { singleton: true, strictVersion: true, requiredVersion: 'auto' },
          "@angular/common": { singleton: true, strictVersion: true, requiredVersion: 'auto' },
          "@angular/common/http": { singleton: true, strictVersion: true, requiredVersion: 'auto' },
          "@angular/router": { singleton: true, strictVersion: true, requiredVersion: 'auto' },

          ...sharedMappings.getDescriptors()
        })

    }),
    sharedMappings.getPlugin()
  ],
};

​

当我在shell应用程序中使用对远程模块的引用时，一切都很顺利，如下所示：

​

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { HomeComponent } from './components/home/home.component';

const routes: Routes = [{
  path: '',
  component: HomeComponent,
  pathMatch: 'full'
}, {
  path: 'myremote',
  loadChildren: () => import('myremote/Module').then(m => m.MyRemoteModule)
}];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

​

当远程模块的组件在其代码中实例化一个新的Web工作人员时会出现这个问题，如下所示：

​

const myWorker = new Worker(
    new URL('../path/to/workers/worker.ts',
    import.meta.url
  ),
  { type: 'module', name: 'my-worker' }
);
// since I'm also using comlink, I also do that, but that's not really relevant here
this.worker = this.createWrapper<WorkerService>(myWorker);

​

上面的代码( Webpack 5 )已经在我的应用程序my-worker.js中生成了一个单独的包，它既不是组件的一部分，也不是组件的包。因此，将模块公开给module，不会暴露到remoteEntry.js中，也不会暴露到工作人员的代码中。然后尝试使用shell应用程序导航到加载我的遥控器的路由，会出错并通知：

错误: Uncaught (承诺)：SecurityError:未能构造'Worker'：脚本在'http://localhost:4250/my-worker.js‘不能从原始的http://localhost:5000'访问。错误:未能构造'Worker'：在'http://localhost:4250/my-worker.js‘处的脚本无法从原始的'http://localhost:5000'’访问。

所以问题是，如果我想要有一个遥控器，并公开它的模块在一个shell应用程序中使用，而它的一个模块使用一个Web工作者，我如何确保Webpack创建的单独的工人包也被公开，以便shell应用能够实例化它？

Answer 1

感谢亚历山大-阿卡伊特，答案就在这里。

https://github.com/webpack/webpack/discussions/14380

假设错误是SecurityError

错误:未知(承诺)：SecurityError

该问题与需要在本地服务器中设置CORS有关。

Answer 2

我找到了解决办法。

步骤1.在单独的文件中创建自定义工作者类

export class CorsWorker {
 private readonly worker: Worker;

constructor(url: string | URL) {
    const objectURL = URL.createObjectURL(
        new Blob([`importScripts(${JSON.stringify(url.toString())});`], {
            type: 'application/javascript'
        })
    );
    this.worker = new Worker(objectURL);
    URL.revokeObjectURL(objectURL);
}

getWorker() {
    return this.worker;
 }
}

步骤2-不要使用Webpack工作人员，而是使用CorsWorker导入您的员工文件。

import { CorsWorker as Worker } from './cors-worker';

// aliasing CorsWorker to Worker makes it statically analyzable
const corsWorker = new Worker(new URL('../worker', import.meta.url));

const worker = corsWorker.getWorker();

这个例子适用于我。我们可以通过以下GitHub讨论线程https://github.com/webpack/webpack/discussions/14648获得更多信息