importing a variable from one typescript file into another

I am attempting to import a variable from one type script file into another.

the variable I want to import is cityListUrl

the type script file it is in is coded like this:

export class backendUrls{

// root url
rooturl:string= 'http://127.0.0.1:8000';

//get a list of all cities
cityListUrl:string = this.rooturl + '/api/city/';


}


the file I want to import it into looks like this:

import {Injectable} from '@angular/core';
import {Http} from '@angular/http';
import {backendUrls} from 'app/backendUrls';

@Injectable()
export class cityGetService{
constructor(private http: Http){}

cityGet(){
this.http.get(backendUrls.cityListUrl)
}
}


the cityListUrl in my pycharm editor is currently red. with the message

TS2339: 'cityListUrl' does not exist on type 'typeof backendUrls'.


has anyone had this issue before? How would I fix this? Thank you

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