/**
 * Base service class providing common functionality for all services
 */
export declare abstract class BaseService {
    /**
     * Validate input using Zod schema
     */
    protected validateInput<T>(schema: any, data: T, context: string): T;
    /**
     * Check if entity exists and throw appropriate error if not
     */
    protected checkEntityExists<T>(entity: T | null, entityType: string, identifier: string, context?: string): T;
    /**
     * Check for conflicts and throw appropriate error if found
     */
    protected checkForConflict<T>(existing: T | null, entityType: string, identifier: string, context?: string): void;
    /**
     * Validate business rules and throw domain error if violated
     */
    protected validateBusinessRule(condition: boolean, message: string, context?: string): void;
    /**
     * Get current timestamp
     */
    protected getCurrentTimestamp(): Date;
    /**
     * Create timestamp pair for new entities
     */
    protected createTimestamps(): {
        createdAt: Date;
        updatedAt: Date;
    };
    /**
     * Update timestamp for existing entities
     */
    protected updateTimestamp(): Date;
}
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