Angular 服务器端渲染应用常见的内存泄漏问题小结

import { Injectable, NgZone } from "@angular/core";
import { interval } from "rxjs";
@Injectable()
export class LocationService {
  constructor(ngZone: NgZone) {
    ngZone.runOutsideAngular(() => interval(1000).subscribe(() => {
      ...
    }));
  }
}

import { Injectable, NgZone, OnDestroy } from "@angular/core";
import { interval, Subscription } from "rxjs";
@Injectable()
export class LocationService implements OnDestroy {
  private subscription: Subscription;

  constructor(ngZone: NgZone) {
    this.subscription = ngZone.runOutsideAngular(() =>
      interval(1000).subscribe(() => {})
    );
  }
  ngOnDestroy(): void {
    this.subscription.unsubscribe();
  }
}

// You can see this by adding:
// You should see a console log in the server
// `Running on the server with appId=my-app-id`
// and then you'll see in the browser console something like
// `Running on the browser with appId=my-app-id`
export class AppModule {
  constructor(
    @Inject(PLATFORM_ID) private platformId: Object,
    @Inject(APP_ID) private appId: string) {
    const platform = isPlatformBrowser(this.platformId) ?
      'in the browser' : 'on the server';
    console.log(`Running ${platform} with appId=${this.appId}`);
  }
}

function _render<T>(
    platform: PlatformRef, moduleRefPromise: Promise<NgModuleRef<T>>): Promise<string> {
  return moduleRefPromise.then((moduleRef) => {
    const transitionId = moduleRef.injector.get(ɵTRANSITION_ID, null);
    if (!transitionId) {
      throw new Error(
          `renderModule[Factory]() requires the use of BrowserModule.withServerTransition() to ensure
the server-rendered app can be properly bootstrapped into a client app.`);
    }
    const applicationRef: ApplicationRef = moduleRef.injector.get(ApplicationRef);
    return applicationRef.isStable.pipe((first((isStable: boolean) => isStable)))
        .toPromise()
        .then(() => {
          const platformState = platform.injector.get(PlatformState);
         ...