import { OpeningCollection } from "../src/types.js";
interface EcoCategoryData {
    url: string;
    json?: OpeningCollection;
}
interface OpeningsByCat {
    initialized: boolean;
    A?: EcoCategoryData;
    B?: EcoCategoryData;
    C?: EcoCategoryData;
    D?: EcoCategoryData;
    E?: EcoCategoryData;
    IN?: EcoCategoryData;
}
/**
 * Downloads and caches opening data from the eco.json GitHub repository.
 * Data is fetched once and cached for subsequent calls.
 *
 * @returns Promise resolving to opening data organized by ECO category
 *
 * @example
 * ```typescript
 * const { A, B, C, D, E, IN } = await getLatestEcoJson();
 * console.log(A?.json); // ecoA.json data
 * console.log(IN?.json); // eco_interpolated.json data
 * ```
 */
export declare function getLatestEcoJson(): Promise<OpeningsByCat>;
/**
 * Downloads and merges all opening data (ecoA-E + interpolated) into a single collection.
 * Data is cached after the first call.
 *
 * @returns Promise resolving to a complete opening collection keyed by FEN
 *
 * @example
 * ```typescript
 * const openings = await openingBook();
 * const fen = "rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3";
 * console.log(openings[fen]); // Opening data for this position
 * ```
 */
export declare function openingBook(): Promise<OpeningCollection>;
export {};
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