import type { UIMessage as UIMessageV4 } from '../../../_types/@internal_ai-sdk-v4/dist/index.js';
import type { AIV5Type, CoreMessageV4 } from '../types.js';
import type { MastraMessagePart } from './types.js';
/**
 * CacheKeyGenerator - Centralized cache key generation for message equality checks
 *
 * This class provides consistent cache key generation across all message formats,
 * which is critical for:
 * - Deduplication of messages
 * - Detecting when messages have been updated
 * - Comparing messages across different formats
 *
 * Cache key invariants:
 * - Same message content should always produce the same key
 * - Different content should produce different keys
 * - Provider metadata (e.g., OpenAI reasoning itemId) must be included for proper distinction
 */
export declare class CacheKeyGenerator {
    /**
     * Generate cache key from AIV4 UIMessage parts
     */
    static fromAIV4Parts(parts: UIMessageV4['parts']): string;
    /**
     * Generate cache key from a single AIV4 UIMessage part
     */
    static fromAIV4Part(part: UIMessageV4['parts'][number]): string;
    /**
     * Generate cache key from MastraDB message parts
     */
    static fromDBParts(parts: MastraMessagePart[]): string;
    /**
     * Generate cache key from AIV4 CoreMessage content
     */
    static fromAIV4CoreMessageContent(content: CoreMessageV4['content']): string;
    /**
     * Generate cache key from AIV5 UIMessage parts
     */
    static fromAIV5Parts(parts: AIV5Type.UIMessage['parts']): string;
    /**
     * Generate cache key from AIV5 ModelMessage content
     */
    static fromAIV5ModelMessageContent(content: AIV5Type.ModelMessage['content']): string;
}
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