import type { Book, LibraryInfo, SearchCallback, SearchOptions, SearchResult } from "./types";
/**
 * Strip HTML tags from a string. Returns empty string for nullish input.
 */
export declare function stripHtml(str: string | undefined | null): string;
/**
 * Print book list as formatted JSON to console.
 */
export declare function printBookList(booklist: Book[]): void;
/**
 * Print total book count and current page information.
 */
export declare function printTotalBookCount(book: SearchResult): void;
/**
 * Convert comma separated strings to Array.
 */
export declare function getArrayFromCommaSeparatedString(libs: string | undefined | null): string[];
/**
 * Extract library names from a library list.
 */
export declare function getLibraryNames(lst: LibraryInfo[]): string[];
/**
 * Create a library code lookup function for a given library list.
 * Factory pattern to avoid duplicating getLibraryCode() in each module.
 */
export declare function createLibraryCodeLookup(libraryList: LibraryInfo[]): (libraryName: string) => string;
/**
 * Extract the first number from a string.
 * Useful for parsing count values from text like "총 123건".
 */
export declare function extractNumber(text: string | undefined | null, defaultValue?: string): string;
/**
 * Validate search options. Throws an error if validation fails.
 */
export declare function validateSearchOptions(opt: SearchOptions): void;
/**
 * Wrap an async function to support both Promise and callback patterns.
 * Callback follows Node.js convention (err, result) for backward compatibility with older consumers.
 */
export declare function wrapWithCallback<T extends SearchOptions>(asyncFn: (opt: T) => Promise<SearchResult>): (opt: T, callback?: SearchCallback) => Promise<SearchResult | void>;
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