Error rxjs_Observable__.Observable.forkJoin is not a function?

Question

I am using Rxjs in an angualr-cli application.

in viewer.component.ts

    //Other Imports
    import { Observable } from \'rxj         


        

Answer 1

In one project I used the following forkjoin code to upload images, it works perfectly.

/**
       *  Upload multiple image and then update the feature
       */
      public uploadImages(apiParams: any[], imageItems: any[]): Observable {
        if (imageItems.length === 0) return;

        let promises = [];
        for (let imageItem of imageItems) {
          promises.push(this.uploadImage(apiParams, imageItem));
        }
        return Observable.forkJoin(...promises);
      }

      /**
       * upload single image
       */
      public uploadImage(apiParams: any[], imageItem: any): any {
        let _formData = new FormData();
        _formData.append("UploadedImage", imageItem,  (new Guid()).toString()+'.png');
        const imageApiUrl = StringFormatter.format(imagePoints.create, apiParams);
        return Observable.fromPromise(
          fetch(imageApiUrl, {
            method: "POST",
            body: _formData
          })
          .then(result => result.json())
        );
      }