import type { Span } from '@opentelemetry/api';
import { type ArvoContract, type ArvoEvent, VersionedArvoContract } from 'arvo-core';
import type { z } from 'zod';
/**
 * Result type for event validation operations.
 *
 * Discriminated union representing all possible validation outcomes:
 * - VALID: Event passed all validation checks
 * - CONTRACT_UNRESOLVED: No matching contract found for the event
 * - INVALID: Event dataschema conflicts with contract (URI or version mismatch)
 * - INVALID_DATA: Event data doesn't match contract schema (Zod validation failure)
 */
export type EventValidationResult = {
    type: 'VALID';
    contractType: 'self' | 'service';
} | {
    type: 'CONTRACT_UNRESOLVED';
} | {
    type: 'INVALID';
    error: Error;
} | {
    type: 'INVALID_DATA';
    error: z.ZodError;
};
/**
 * Configuration for event validation.
 */
export type EventValidationConfig = {
    /** The event to validate */
    event: ArvoEvent;
    /** Self contract for initialization event validation */
    selfContract: VersionedArvoContract<any, any> | ArvoContract;
    /** Service contracts for response event validation */
    serviceContracts: Record<string, VersionedArvoContract<any, any>>;
    /** Optional OpenTelemetry span for logging */
    span?: Span;
};
/**
 * Validates an event against provided contracts.
 *
 * Performs comprehensive validation including:
 * - Dataschema parsing and resolution
 * - Contract resolution (self vs service)
 * - URI and version compatibility checks
 * - Schema-based data validation
 */
export declare function validateInputEvent({ event, selfContract, serviceContracts, span, }: EventValidationConfig): EventValidationResult;