/**
 * File Loader Module
 * Handles SQL file discovery, loading, and validation
 */
import type { IFileLoadOptions, ILoadedFile } from '../../types/apply';
export declare class FileLoader {
    private readonly migrationNamePattern;
    private readonly upFileName;
    private readonly backfillFileName;
    private readonly constraintsFileName;
    private readonly verifyFileName;
    /**
     * Load SQL files based on provided options
     */
    loadFiles(options: IFileLoadOptions): Promise<ILoadedFile[]>;
    /**
     * Discover SQL files from standardized migration directory structure
     * Format:
     *   migrations/
     *     20260416103000_init_schema/
     *       up.sql
     *       down.sql (optional)
     *       migration.json (optional)
     */
    private discoverFilesInFolder;
    /**
     * Validate migration folder naming convention
     */
    private validateMigrationDirectoryName;
    /**
     * Parse migration order from directory prefix
     */
    private parseMigrationOrder;
    /**
     * Load a single SQL file
     */
    private loadSingleFile;
    /**
     * Calculate SHA-256 checksum of file content
     */
    private calculateChecksum;
    /**
     * Sort files by execution order
     */
    private sortFilesByOrder;
}
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