import type { LspTransport } from "./types.js";
/** The slice of `ws`'s WebSocket the transport uses (so tests can supply a fake). */
export interface WsLike {
    send(data: string): void;
    close(): void;
    on(event: "message" | "close" | "error" | "pong", listener: (arg?: unknown) => void): void;
    /** WS ping frame (keepalive + liveness probe). Optional — fakes without it get no ping-liveness. */
    ping?(): void;
    /** Hard-kill the socket (skip the close handshake) — used when a ping goes unanswered (half-open). */
    terminate?(): void;
}
export declare class WsLspTransport implements LspTransport {
    private readonly ws;
    private readonly requestTimeoutMs;
    private nextId;
    private readonly pending;
    private isClosed;
    private keepalive;
    private awaitingPong;
    /** [ref]: server→client NOTIFICATION subscribers (publishDiagnostics etc.). */
    private readonly notificationHandlers;
    constructor(ws: WsLike, requestTimeoutMs?: number, keepaliveMs?: number);
    /** Manager-visible liveness (LspTransport.closed): evict + reopen instead of reusing a dead connection. */
    get closed(): boolean;
    private onMessage;
    private failAll;
    request(method: string, params: unknown, signal?: AbortSignal): Promise<unknown>;
    notify(method: string, params: unknown): void;
    /** [ref] (core 1.220): subscribe to server→client notifications; returns unsubscribe. Additive —
     *  core's diagnostics registry is the intended consumer; with no subscriber, behavior is byte-identical. */
    onNotification(handler: (method: string, params: unknown) => void): () => void;
    close(): Promise<void>;
}
/**
 * Connect to a language server's WS bridge inside E2B and run the LSP `initialize`/`initialized` handshake.
 * Returns `undefined` on any failure (→ the manager degrades that language gracefully). `wsUrl` is the
 * `wss://…e2b.dev` URL from `sandbox.getHost(port)`; `rootPath` is the in-sandbox workspace root.
 */
export declare function connectWsLspTransport(wsUrl: string, rootPath: string, signal?: AbortSignal, initializationOptions?: unknown): Promise<LspTransport | undefined>;
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