ES6 Singleton vs Instantiating a Class once

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I would recommend neither. This is totally overcomplicated. If you only need one object, do not use the class syntax! Just go for

import Constants from '../constants';

export default {
  url: Constants.API_URL,
  getCities() {
    return fetch(this.url, { method: 'get' }).then(response => response.json());
  }
};


import API from './services/api-service'

or even simpler

import Constants from '../constants';

export const url = Constants.API_URL;
export function getCities() {
  return fetch(url, { method: 'get' }).then(response => response.json());
}


import * as API from './services/api-service'

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