/**
 * @nahisaho/yata-scale - Migration Helper
 *
 * Helps migrate from yata-local to yata-scale
 */
import { type Result } from 'neverthrow';
import type { Entity, Relationship, YataScaleConfig } from './types.js';
import { InitializationError } from './errors.js';
/**
 * Migration progress
 */
export interface MigrationProgress {
    readonly totalEntities: number;
    readonly migratedEntities: number;
    readonly totalRelationships: number;
    readonly migratedRelationships: number;
    readonly errors: string[];
    readonly startTime: Date;
    readonly currentPhase: 'entities' | 'relationships' | 'indexes' | 'complete';
}
/**
 * Migration options
 */
export interface MigrationOptions {
    readonly batchSize?: number;
    readonly validateData?: boolean;
    readonly preserveIds?: boolean;
    readonly onProgress?: (progress: MigrationProgress) => void;
}
/**
 * Source data provider
 */
export interface DataSource {
    getEntities(): AsyncGenerator<Entity>;
    getRelationships(): AsyncGenerator<Relationship>;
    getEntityCount(): Promise<number>;
    getRelationshipCount(): Promise<number>;
}
/**
 * Target data sink
 */
export interface DataSink {
    putEntity(entity: Entity): Promise<void>;
    putRelationship(relationship: Relationship): Promise<void>;
    flush(): Promise<void>;
}
/**
 * Migration helper for transitioning to yata-scale
 */
export declare class MigrationHelper {
    private readonly batchSize;
    private progress;
    constructor(options?: MigrationOptions);
    /**
     * Migrate data from source to target
     */
    migrate(source: DataSource, sink: DataSink, options?: MigrationOptions): Promise<Result<MigrationProgress, InitializationError>>;
    /**
     * Migrate entities
     */
    private migrateEntities;
    /**
     * Migrate relationships
     */
    private migrateRelationships;
    /**
     * Process a batch
     */
    private processBatch;
    /**
     * Validate entity
     */
    private validateEntity;
    /**
     * Validate relationship
     */
    private validateRelationship;
    /**
     * Get current progress
     */
    getProgress(): MigrationProgress;
    /**
     * Get migration percentage
     */
    getPercentage(): number;
    /**
     * Generate configuration for yata-scale based on data
     */
    static generateConfig(entityCount: number, relationshipCount: number): Partial<YataScaleConfig>;
}
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