export declare function useTypingEffect({ content, isLast, isStreaming, streamEnded, onCompleted, setIsTyping, }: {
    content: string;
    isLast: boolean;
    isStreaming: boolean;
    setIsTyping?: () => void;
    streamEnded: boolean;
    onCompleted?: () => void;
}): {
    displayedContent: string;
};
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