Василий Мажекин

<div *ngFor="let column of tableColumnsConfig | toIterable | trueOnlyBy : 'value'">
   {{column.name}}
</div>

@Pipe({
  name: 'toIterable'
})
export class ToIterablePipe implements PipeTransform {
  transform(dict: Object) {
    return Object.keys(dict || {}).map(key => dict[key]);
  }
}

@Pipe({
  name: 'trueOnlyBy'
})
export class TrueOnlyByPipe implements PipeTransform {
  transform(arr: any[], propName: string): object {
    return arr.filter(item => !!item[propName]);
  }
}

{
  "/api/*": {
    "target":  {
      "host": "moi-host-api.ru",
      "protocol": "https:",
      "port": 443
    },
    "secure": true,
    "changeOrigin": true,
    "logLevel": "debug"
  }

this.servValue.getValues().subscribe(value => {
      if(!this.attribute) { return; }
       ...

static create(options: {
        providers: StaticProvider[];
        parent?: Injector;
        name?: string;
    }): Injector;

const options = {
  providers: inputProviders,
  parent: this.container.parentInjector
};
const injector = Injector.create(options);

buildMarkers(cars): void {
  return Observable.create(observer => {
    for (let i in cars) {
      let lat: number = cars[i].coordinates.lat;
      let lon: number = cars[i].coordinates.lon;
      let pin = cars[i].pin;
      let singleMarker = new Marker([lat, lon], {
        icon: new DivIcon({
          className: 'my-div-icon',
          html: this.getHtmlMarker(cars, pin)
        })
      });
      this.layers.push(singleMarker);
    };
    
    observer.next();
    observer.complete()
  });
};

public mapReady(map) {
    this.map = map;
    let that = this;

    that.buildMarkers(this.cars).subscribe(() => {
      // тут выполните код, который гарантированно выполнится после buildMarkers
    });
   
  };