/** Options for controlling the migration process. */
export interface RvfMigrationOptions {
    verbose?: boolean;
    /** Entries per batch (default 500). */
    batchSize?: number;
    /** Embedding dimensions for target RVF file (default 1536). */
    dimensions?: number;
    onProgress?: (progress: {
        current: number;
        total: number;
        phase: string;
    }) => void;
}
/** Result returned after a migration completes. */
export interface RvfMigrationResult {
    success: boolean;
    entriesMigrated: number;
    sourceFormat: string;
    targetFormat: string;
    durationMs: number;
    errors: string[];
}
/**
 * Bidirectional migration utility between RVF and legacy memory formats.
 *
 * All methods are static — no instantiation required.
 */
export declare class RvfMigrator {
    /** Migrate a JSON memory file to RVF format. */
    static fromJsonFile(jsonPath: string, rvfPath: string, options?: RvfMigrationOptions): Promise<RvfMigrationResult>;
    /** Migrate a SQLite (better-sqlite3 / sql.js) database to RVF. */
    static fromSqlite(dbPath: string, rvfPath: string, options?: RvfMigrationOptions): Promise<RvfMigrationResult>;
    /** Export an RVF file back to a JSON array (backward compatibility). */
    static toJsonFile(rvfPath: string, jsonPath: string): Promise<RvfMigrationResult>;
    /**
     * Detect file format by magic bytes.
     * - RVF\0 (0x52 0x56 0x46 0x00) -> 'rvf'
     * - SQLi  (0x53 0x51 0x4C 0x69) -> 'sqlite'
     * - Leading [ or {              -> 'json'
     */
    static detectFormat(filePath: string): Promise<'rvf' | 'json' | 'sqlite' | 'unknown'>;
    /** Auto-detect source format and migrate to RVF. */
    static autoMigrate(sourcePath: string, targetRvfPath: string, options?: RvfMigrationOptions): Promise<RvfMigrationResult>;
}
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