/**
 * Shared realtime catalog SSE envelope unwrap (kiosk + customer).
 *
 * Backend SSEService wraps events as `{ eventId, eventVersion, eventType, payload, checksum, … }`.
 * Fail-closed: unsupported version or bad checksum → drop.
 * product_update unwrap: when `payload.type` is a string, use payload as the normalized message.
 */
import { REALTIME_SSE_VALIDATION_CODES, type RealtimeEnvelope } from './realtimeEnvelope.js';
export type ParseRealtimeCatalogSseStatus = 'ok' | 'passthrough' | 'drop' | 'invalid_json';
export interface ParseRealtimeCatalogSseOk {
    readonly status: 'ok';
    readonly message: Record<string, unknown>;
    readonly envelope: RealtimeEnvelope;
}
export interface ParseRealtimeCatalogSsePassthrough {
    readonly status: 'passthrough';
    readonly message: unknown;
}
export interface ParseRealtimeCatalogSseDrop {
    readonly status: 'drop';
    readonly code?: (typeof REALTIME_SSE_VALIDATION_CODES)[keyof typeof REALTIME_SSE_VALIDATION_CODES];
}
export interface ParseRealtimeCatalogSseInvalidJson {
    readonly status: 'invalid_json';
}
export type ParseRealtimeCatalogSseResult = ParseRealtimeCatalogSseOk | ParseRealtimeCatalogSsePassthrough | ParseRealtimeCatalogSseDrop | ParseRealtimeCatalogSseInvalidJson;
/**
 * Unwrap a parsed JSON value that may be a realtime envelope.
 * Non-envelopes pass through unchanged.
 */
export declare function unwrapRealtimeCatalogSsePayload(parsed: unknown): ParseRealtimeCatalogSseResult;
/**
 * Parse raw EventSource `data` and unwrap realtime envelopes for catalog handlers.
 */
export declare function parseRealtimeCatalogSseMessage(rawData: string): ParseRealtimeCatalogSseResult;
/**
 * Customer EventSource detail helper: return JSON string of unwrapped message,
 * original raw for non-envelopes, or empty string when fail-closed drop / bad JSON.
 */
export declare function normalizeRealtimeCatalogSseEventData(rawData: string): string;
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