// global.ts
export const GlobalVariable = Object.freeze({
BASE_API_URL: 'http://example.com/',
//... more of your variables
});
/*************************** in other files ****************************/
//anotherfile.ts that refers to global constants
import { GlobalVariable } from './path/global';
export class HeroService {
private baseApiUrl = GlobalVariable.BASE_API_URL;
//... more code
}