Angular hmr 적용하기

hmr 이란?

Hot Module Replacement의 약자로 모듈의 변경사항을 실시간으로 어플리케이션에 반영한다.

angular에 environment 추가하기

environment.hmr.ts 파일 만들기

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

src/environments/environment.prod.ts 수정하기

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

src/environments/environment.ts 수정하기

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

angular-cli.json 수정하기

    "environmentSource": "environments/environment.ts",
    "environments": {
      "dev": "environments/environment.ts",
      "hmr": "environments/environment.hmr.ts",
      "prod": "environments/environment.prod.ts"
    },

package.json 수정하기

  "scripts": {
    "start": "ng serve",
    "hmr": "ng serve --hmr -e=hmr",
    "lint": "tslint \"src/**/*.ts\"",
    "test": "ng test",
    "pree2e": "webdriver-manager update",
    "e2e": "protractor"
  }

npm run hmr 명령어를 통해 environment를 적용할 수 있다.

hmr 모듈 import 하기

npm install --save-dev @angularclass/hmr

src/hmr.ts 생성하기

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);
    ngModule.destroy();
    makeVisible();
  });
};

src/main.ts 수정하기

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) {
  if (module[ 'hot' ]) {
    hmrBootstrap(module, bootstrap);
  } else {
    console.error('HMR is not enabled for webpack-dev-server!');
    console.log('Are you using the --hmr flag for ng serve?');
  }
} else {
  bootstrap();
}

새로운 환경 반영하기

npm run hmr

출처

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