import { type WsFrame, type WsTimers } from "./frames.js";
import { PortSocketCore } from "./socket-core.js";
export interface ServerWebSocketOptions {
    /** The url the client asked for. */
    url?: string;
    /** The subprotocol the server picked, `""` for none. */
    protocol?: string;
    timers?: WsTimers;
    /** How long `close()` waits for the client's echo, in ms. Default 5 s. */
    closeTimeoutMs?: number;
}
/**
 * The server end of a socket over a `MessagePort`: what a handler gets from
 * `upgradeWebSocket` and talks to.
 *
 * - Events are delivered only after `accept()`; frames that arrive earlier are
 *   queued. Pings are answered even before `accept()`, so a slow handler does
 *   not look like a dead one.
 * - Messages arrive as strings or `ArrayBuffer`s.
 * - `bufferedAmount` counts what the client has not consumed yet, and
 *   `whenDrained(limit)` waits for it to fall: the backpressure a producer
 *   applies.
 * - When the client's pings stop for three heartbeat periods (a closed tab, a
 *   terminated worker), the socket closes with 1006.
 */
export declare class ServerWebSocket extends PortSocketCore {
    static readonly CONNECTING = 0;
    static readonly OPEN = 1;
    static readonly CLOSING = 2;
    static readonly CLOSED = 3;
    readonly url: string;
    readonly protocol: string;
    private _accepted;
    private _queue;
    private _heartbeatMs;
    private _lastPing;
    private _watch;
    constructor(port: MessagePort, options?: ServerWebSocketOptions);
    /** Whether `accept()` was called. */
    get accepted(): boolean;
    /** Starts delivering events, the queued ones first. */
    accept(): void;
    send(data: string | ArrayBuffer | ArrayBufferView): void;
    close(code?: number, reason?: string): void;
    protected _deliver(frame: Extract<WsFrame, {
        t: "m" | "c";
    }>): void;
    protected _dispatchMessage(data: string | ArrayBuffer): void;
    protected _onPing(hb: number): void;
    protected _onClosed(): void;
    private _watchHeartbeat;
}
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