coderkan

export const environment = {
 production: false,
 hmr: true
};

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export const environment = {
 production: true,
 hmr: false
};

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export const environment = {
 production: false,
 hmr: false
};

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"build": {
    "configurations": {
      ...
      "hmr": {
        "fileReplacements": [
          {
            "replace": "src/environments/environment.ts",
            "with": "src/environments/environment.hmr.ts"
          }
        ]

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$ npm install --save-dev @angularclass/hmr

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{
  ...
  "compilerOptions": {
    ...
    "types": ["node"]
  },
}

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"scripts": {
  ...
  "hmr": "ng serve --configuration hmr"
}

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import { NgModuleRef, ApplicationRef } from '@angular/core';
import { createNewHosts } from '@angularclass/hmr';
export const hmrBootstrap = (module: any, bootstrap: () => Promise<NgModuleRef<any>>) => {
  let ngModule: NgModuleRef<any>;
  module.hot.accept();
  bootstrap().then(mod => ngModule = mod);
  module.hot.dispose(() => {
    const appRef: ApplicationRef = ngModule.injector.get(ApplicationRef);
    const elements = appRef.components.map(c => c.location.nativeElement);
    const makeVisible = createNewHosts(elements);

coderkan

import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app/app.module';
import { environment } from './environments/environment';
import { hmrBootstrap } from './hmr';
if (environment.production) {
  enableProdMode();
}
const bootstrap = () => platformBrowserDynamic().bootstrapModule(AppModule);
if (environment.hmr) {

coderkan

import { Directive, ViewContainerRef } from '@angular/core';
@Directive({ selector: '[framework-host]' })
export class FrameworkDirective {
    constructor(public viewContainerRef: ViewContainerRef) { }
}