In an effort to make working on our large frontend projects more manageable, we are looking to split them into multiple independently deployed projects. I am attempting to integrate a bundled ngModule to handle a route from within another app. It is crucial that the apps remain unaware of each other's configurations. The bundles will share some major dependencies, such as Angular, through global variables. While we may encounter some duplicate dependencies, we do not require tree shaking across the bundles.

The main issue arises when the root router displays the error:

Error: No NgModule metadata found for 'TestsetModule'.

This suggests that the child module is not being angular compiled on load or is failing to register its module for some reason. I assume manual compilation of the module might be necessary, but I am unsure how to utilize the https://angular.io/api/core/Compiler#compileModuleAndAllComponentsAsync method.

The root app loads the child module through a route:

import { ModuleWithProviders } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
const load = require("little-loader");


const routes: Routes = [
  { path: ``, loadChildren: () => new Promise(function (resolve) {
      load('http://localhost:3100/testset-module-bundle.js',(err) => {
        console.log('global loaded bundle is: ', (<any>global).TestsetModule )
        resolve((<any>global).TestsetModule)
      }
    )
  })}
];

export const HostRouting: ModuleWithProviders = RouterModule.forRoot(routes);

I also attempted to use Angular router's string resolution syntax instead of the global approach, but encountered similar issues.

Here is the module being loaded, which is quite standard except for the global export:

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { HttpModule } from '@angular/http';
//import { MaterialModule } from '@angular/material';
import { FlexLayoutModule } from '@angular/flex-layout';
import { FormsModule }   from '@angular/forms';
import { LoggerModule, Level } from '@churro/ngx-log';

import { FeatureLoggerConfig } from './features/logger/services/feature-logger-config';


import { TestsetComponent } from './features/testset/testset.component';
import { TestsetRouting } from './testset.routing';

@NgModule({
    imports: [
        CommonModule,
        //MaterialModule,
        FlexLayoutModule,
        HttpModule,
        FormsModule,
        LoggerModule.forChild({
          moduleName: 'Testset',
          minLevel: Level.INFO
        }),
        TestsetRouting,
    ],
    declarations: [TestsetComponent],
    providers: [
      /* TODO: Providers go here */
    ]
})
class TestsetModule { }
(<any>global).TestsetModule = TestsetModule

export {TestsetModule as default, TestsetModule};

The webpack configuration for the root bundle is as follows. Note the global exports via the "ProvidePlugin".

const webpack = require('webpack');
const AotPlugin = require('@ngtools/webpack').AotPlugin;
const path = require('path');
const BrowserSyncPlugin = require('browser-sync-webpack-plugin');
const IgnorePlugin = require('webpack/lib/IgnorePlugin');
const PolyfillsPlugin = require('webpack-polyfills-plugin');
const WebpackSystemRegister = require('webpack-system-register');


module.exports = (envOptions) => {
    envOptions = envOptions || {};
    const config = {

        entry: {
          'bundle': './root.ts'
        },
        output: {

          libraryTarget: 'umd',
          filename: '[name].js',//"bundle.[hash].js",
          chunkFilename: '[name]-chunk.js',
          path: __dirname
          },
          externals: {

          },
        resolve: {
            extensions: ['.ts', '.js', '.html'],
        },
        module: {
            rules: [
                { test: /\.html$/, loader: 'raw-loader' },
                { test: /\.css$/, loader: 'raw-loader' },

            ]
        },
        devtool: '#source-map',
        plugins: [
          new webpack.ProvidePlugin({
            'angular': '@angular/core',
            'ngrouter': '@angular/router',
            'ngxlog':'@churro/ngx-log'
          })

        ]
    };
    config.module.rules.push(
      { test: /\.ts$/, loaders: [
        'awesome-typescript-loader', 
        'angular-router-loader',
        'angular2-template-loader', 
        'source-map-loader'
      ] } 
    );
  }



    return config;
};

Similarly, the webpack configuration for the child bundle is provided below. Notice the "externals" section, which looks for Angular as a global.

module.exports = (envOptions) => {
    envOptions = envOptions || {};
    const config = {
        entry: {
          'testset-module-bundle': './src/index.ts'
        },
        output: {
          //library: 'TestsetModule',
          libraryTarget: 'umd',
          filename: '[name].js',//"bundle.[hash].js",
          chunkFilename: '[name]-chunk.js',
          path: path.resolve(__dirname, "dist")
          },
          externals: {
             'angular': '@angular/core',
             'ngrouter': '@angular/router',
             'ngxlog': '@churro/ngx-log'       
          },
        resolve: {
            extensions: ['.ts', '.js', '.html'],
        },
        module: {
            rules: [
                { test: /\.html$/, loader: 'raw-loader' },
                { test: /\.css$/, loader: 'raw-loader' },

            ]
        },
        devtool: '#source-map',
        plugins: [

        ]
    };

    config.module.rules.push(
      { test: /\.ts$/, loaders: [
        'awesome-typescript-loader', 
        'angular-router-loader',
        'angular2-template-loader', 
        'source-map-loader'
      ] }
    );
  }



    return config;
};

Lastly, here is my tsconfig file, which is read by 'awesome-typescript-loader'.

{
  "compilerOptions": {
    "target": "es5",
    "module": "es2015",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": true,
    "suppressImplicitAnyIndexErrors": true,
    "baseUrl": ".",
    "rootDir": "src",
    "outDir": "app",
    "paths": {
      "@capone/*": [
        "*"
      ],
      "@angular/*": [
        "node_modules/@angular/*"
      ],
      "rxjs/*": [
        "node_modules/rxjs/*"
      ]
    }
  },

  "exclude": ["node_modules", "src/node_modules", "compiled", "src/dev_wrapper_app"],
  "angularCompilerOptions": {
    "genDir": "./compiled",
    "skipMetadataEmit": true
  }
}

If you've made it this far, kudos! I was able to achieve the desired functionality when both bundles were part of the same webpack configuration and the child module was simply a chunk. This setup is supported by Angular. However, our requirement is to keep the children and parent isolated from each other until runtime.