/**
 * Transport Layer — sends telemetry batches to the backend API.
 * Uses fetch with keepalive for unload safety.
 * Retries on 5xx with exponential backoff.
 */
import type { TelemetryEvent } from '../types.js';
export declare function initTransport(config: {
    endpoint: string;
    apiKey: string;
    debug?: boolean;
}): void;
/** Register the SDK's browser-generated public key and keep the registration
 * fresh. Concurrent callers share one request, so getDecision() can safely
 * await this even when init() has already started registration. */
export declare function registerSigningKey(sessionId: string, publicKey: JsonWebKey, force?: boolean): Promise<boolean>;
/**
 * Send a batch of events to the backend.
 */
export declare function sendBatch(events: TelemetryEvent[]): Promise<void>;
/**
 * Send session start notification.
 */
export declare function sendSessionStart(): Promise<void>;
/**
 * Send session end notification.
 */
export declare function sendSessionEnd(): Promise<void>;
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