export declare const buildTreeData: (flatData: any[]) => {
    level: any;
    text: any;
    title: any;
    key: string;
    index: number;
    children: never[];
}[];
export declare const extractHeadingsFromJson: (data: {
    content: any[];
}) => {
    key: string;
    level: any;
    text: string;
}[];
export declare const createImgFileKeyInHtml: (str: string | object) => string | object;
export declare function createFileKeyArray(source: {
    content: any[];
}): {
    type: string;
    content: any[];
};
export declare const flatten: (arr: any, flattened?: any[]) => any[];