import type { Procedure } from "../procedure.ts";
import { type WebSocketLike, type WebSocketOptions } from "../ws.ts";
export interface HealthCheckedWebSocketOptions {
    /**
     * Interval between health checks, in milliseconds. The countdown starts when
     * the previous check succeeds, so the actual time between two checks
     * may be longer than this interval.
     */
    checkEveryMs: number;
    /**
     * Timeout in milliseconds before a running health check is considered failed.
     */
    timeoutMs: number;
    /**
     * When connection is closed because the health check has failed, these arguments
     * are used as status code and reason for closure.
     */
    closeArgs: [code: number, reason: string];
    /**
     * Optional {@link Timers timers} implementation. Useful for using alternative timer
     * implementations (e.g. running timers from a Web Worker to reduce throttling).
     */
    timers?: Timers;
}
export interface Timers {
    setTimeout(handler: () => void, timeout?: number): number;
    clearTimeout(id: number | undefined): void;
}
/**
 * Creates a `WebSocketClient` and wraps it with
 * {@link makeHealthchecked `makeHealthchecked`}.
 */
export declare const createHealthCheckedWebSocketClient: <TSend, TRecv = TSend>(options: WebSocketOptions<TSend, TRecv> & HealthCheckedWebSocketOptions) => ((healthcheck: Procedure<TSend, TRecv, void>) => WebSocketLike<TSend, TRecv>);
/**
 * Wraps the provided `WebSocketClient` and adds a health check. Health check
 * is a {@link WebSocketClient.exec procedure} that runs periodically. If this
 * procedure completes successfully, the health check is considered passed. If
 * it fails, health check is considered failed, the `close` event is dispatched
 * and the connection is closed.
 */
export declare const makeHealthChecked: <TSend, TRecv = TSend, TConn = void>(ws: WebSocketLike<TSend, TRecv, TConn>, options: HealthCheckedWebSocketOptions) => (healthcheck: Procedure<TSend, TRecv, void>) => WebSocketLike<TSend, TRecv, TConn>;
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