import { Payload } from './trackEvent/generated-types';
export declare const getUserIdentifier: ({ identity, anonymous_id }: {
    identity?: string | null;
    anonymous_id?: string | null;
}) => {
    [k: string]: string;
};
export declare const isDefined: (value: string | undefined | null | number | object) => boolean;
export declare const getEventName: (payload: Payload) => string;
