import { SyncBackend } from '@livestore/common';
import { type Duration } from '@livestore/utils/effect';
import type { SyncMetadata } from '../../common/sync-message-types.ts';
export interface HttpSyncOptions {
    /**
     * URL of the sync backend
     *
     * @example
     * ```ts
     * const syncBackend = makeHttpSync({ url: 'https://sync.example.com' })
     * ```
     */
    url: string;
    headers?: Record<string, string>;
    livePull?: {
        /**
         * How often to poll for new events
         * @default 5 seconds
         */
        pollInterval?: Duration.DurationInput;
    };
    ping?: {
        /**
         * @default true
         */
        enabled?: boolean;
        /**
         * How long to wait for a ping response before timing out
         * @default 10 seconds
         */
        requestTimeout?: Duration.DurationInput;
        /**
         * How often to send ping requests
         * @default 10 seconds
         */
        requestInterval?: Duration.DurationInput;
    };
}
/**
 * Note: This implementation requires the `enable_request_signal` compatibility flag to properly support `pull` streaming responses
 */
export declare const makeHttpSync: (options: HttpSyncOptions) => SyncBackend.SyncBackendConstructor<SyncMetadata>;
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