/**
 * Returns current domain.
 *
 * @param {(Function|Object)} stateOrGetState - Redux getState() method or Redux
 * state.
 * @returns {(string|undefined)}
 */
export function getDomain(stateOrGetState) {
    const state
        = typeof stateOrGetState === 'function'
            ? stateOrGetState()
            : stateOrGetState;
    const connection = state['features/base/connection'];
    let domain;

    try {
        domain = connection.connectionOptions.hosts.domain;
    } catch (e) {
        // XXX The value of connectionOptions or any of the properties
        // descending from it may be undefined at some point in the execution
        // (e.g. on start). Instead of multiple checks for the undefined value,
        // we just wrap it in a try-catch block.
    }

    return domain;
}