RC0 - error TS2339: Property 'map' does not exist on type 'Promise<{}>'

Ionic Framework ionic-v3
1

my code below, it’s giving error in RC0, previously it’s working fine…

this.dataService.getCategories().map(res => res.json())
        .subscribe(
          results => {
            if(results.success)
            {
              this.mycategories = results.categories;
            }
          }
        );
2

Did you updated typescript to version 2?

@grabtasker solved it like this