Ghost/ghost/admin/app/mirage/config/configuration.js

import {isEmpty} from 'ember-utils';

export default function mockConfiguration(server) {
    server.get('/configuration/', function (db) {
        if (isEmpty(db.configurations)) {
            server.loadFixtures('configurations');
        }

        return {
            configuration: [db.configurations.find(1)]
        };
    });

    server.get('/configuration/timezones/', function (db) {
        return {
            configuration: [{
                timezones: db.timezones
            }]
        };
    });
}