import { StorageRepository } from "./repository/StorageRepository.js";
import { SourceConfigResolver as Resolver } from "./SourceConfigResolver.js";
import { PrefixIndexLine } from "./utils/typs.js";
import { CacheProvider } from "./cache/CacheProvider.js";
import { IIndexReader } from "./IIndexReader.js";
/**
 * PrefixTreeWalker: handles prefix tree traversal and index reading.
 */
export declare class PrefixTreeWalker implements IIndexReader {
    private readonly repository;
    private readonly resolver;
    private readonly cache;
    constructor(repository: StorageRepository, resolver: Resolver, cache: CacheProvider);
    /**
     * Get PrefixIndexLines for next page.
     */
    readForwardPrefixIndexLines(rootDir: string, pageSize?: number, cursor?: string, orderByKey?: string, isDesc?: boolean): AsyncGenerator<PrefixIndexLine, void, unknown>;
    /**
     * Get PrefixIndexLines for backward pagination.
     */
    readBackwardPrefixIndexLines(rootDir: string, pageSize?: number, cursor?: string, orderByKey?: string, isDesc?: boolean): AsyncGenerator<PrefixIndexLine, void, unknown>;
    /**
     * Read index file lines.
     */
    readIndexFileLines(indexPath: string, reverse: boolean): AsyncGenerator<PrefixIndexLine>;
    /**
     * Find PrefixIndexLine list with stream.
     */
    findIndexLines(sourceName: string, field: string, value: string, filterCallback?: (indexValue: string, argValue: string) => boolean): Promise<null | PrefixIndexLine[]>;
    /**
     * Flatten PrefixIndexLine array by ref keys.
     */
    flatPrefixIndexLine(unflattened: PrefixIndexLine[]): PrefixIndexLine[];
    /**
     * Get the first index of the specified directory.
     */
    private findFirstIndexPath;
    /**
     * Get the index of the deepest level below the specified directory.
     */
    private findLastIndexPath;
    /**
     * Indexes are scanned downward from the specified index directory.
     */
    walkPrefixIndexesDownword(indexParentDir: string): AsyncGenerator<string>;
    /**
     * Indexes are scanned upward from the specified index directory.
     */
    walkPrefixIndexesUpword(indexParentDir: string): AsyncGenerator<string, void, any>;
    /**
     * Get Prefix Index file path converted with Unicode.
     */
    private getIndexPath;
}