import { LoadedMigration } from './migration.interface';
/**
 * Loads migration files from the filesystem.
 *
 * Migration files must:
 * - Be TypeScript files with .ts extension
 * - Export a default class/object implementing the Migration interface (up/down methods)
 *
 * Naming conventions (all supported):
 * - YYYYMMDD-HHMMSS.ts (recommended, generated by scaffold)
 * - 001_initial.ts, 002_add_users.ts (numbered)
 * - create_users.ts, add_posts.ts (descriptive)
 *
 * Files are sorted lexicographically, so use consistent naming for proper order.
 *
 * @example
 * ```typescript
 * const loader = new MigrationLoader('./migrations');
 * const migrations = await loader.loadAllMigrations();
 * ```
 */
export declare class MigrationLoader {
    private migrationsDirectory;
    constructor(migrationsDirectory: string);
    /**
     * Extract a sort key from the filename.
     * For timestamp patterns, extracts the timestamp.
     * For other patterns, uses the filename without extension.
     */
    private extractSortKey;
    /**
     * Get all migration files in the directory, sorted lexicographically.
     * Includes all .ts files in the directory.
     */
    getMigrationFiles(): Promise<string[]>;
    /**
     * Load a single migration file.
     *
     * Uses require() to load the TypeScript file, which works when running
     * with ts-node, tsx, or other TypeScript loaders.
     *
     * @param filename - The migration filename to load
     * @returns The loaded migration with metadata
     * @throws Error if the file doesn't exist or doesn't implement Migration
     */
    loadMigration(filename: string): Promise<LoadedMigration>;
    /**
     * Load all migrations from the directory, sorted lexicographically.
     * @returns Array of loaded migrations in order
     */
    loadAllMigrations(): Promise<LoadedMigration[]>;
    /**
     * Generate a new migration filename with the current timestamp.
     * Format: YYYYMMDD-HHMMSS.ts (recommended naming convention)
     *
     * @returns A new unique migration filename
     */
    generateFilename(): string;
    /**
     * Get the absolute path to the migrations directory.
     * Resolves relative paths against process.cwd().
     */
    getAbsoluteDirectory(): string;
    /**
     * Ensure the migrations directory exists.
     * Creates it (including parent directories) if it doesn't exist.
     */
    ensureDirectory(): void;
}
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