declare class SlangRetailAssistantLifecycleObserver {
    onAssistantInitSuccess: () => void;
    onAssistantInitFailure: (description: string) => void;
    onAssistantInvoked: () => void;
    onAssistantClosed: (isCancelled: boolean) => void;
    onAssistantLocaleChanged: (changedLocale: string) => void;
    onUnrecognisedUtterance: (utterance: string) => void;
    onUtteranceDetected: (utterance: string) => void;
    constructor();
}
export { SlangRetailAssistantLifecycleObserver };