/**
 * CloudflareMessagingClient — HTTP-based messaging with Cloudflare Workers.
 *
 * Cloudflare Workers expose a public `.workers.dev` URL. Axon uses:
 *   POST /message  → deliver a payload; response body is the result
 *   GET  /health   → liveness probe
 *
 * Security:
 *  - Only https:// endpoints are permitted
 *  - Private/internal IP ranges are blocked (prevents SSRF)
 *  - Response bodies are capped at 4 MiB
 *  - Prototype-polluting keys in remote JSON payloads are rejected
 */
import type { Message } from '../../types.js';
export declare class CloudflareMessagingClient {
    private messageHandlers;
    private connected;
    private apiToken;
    connect(secretKey: string): Promise<void>;
    disconnect(): void;
    send(workerUrl: string, payload: unknown): Promise<void>;
    onMessage(handler: (msg: Message) => void): () => void;
    isLive(workerUrl: string): Promise<boolean>;
    get isConnected(): boolean;
}
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