import type { ServerResponse } from "node:http";
export declare class CanvasSession {
    private clients;
    private pending;
    private canvasState;
    health(): {
        ok: boolean;
        hasCanvas: boolean;
        clients: number;
    };
    openEvents(url: URL, res: ServerResponse): void;
    updateState(body: unknown, clientId?: string): void;
    resolveResult(body: {
        requestId?: string;
        error?: string;
        result?: unknown;
    }): void;
    emitAll(type: string, payload: unknown): void;
    callTool(name: unknown, rawInput: unknown): Promise<unknown>;
    private requestCanvasTool;
}