import { Buffer } from "node:buffer";
import type { RuntimeInstanceRecord } from "../../runtime-instance-store.js";
export type RuntimeStreamSubscriber = {
    id: string;
    write: (chunk: Buffer) => boolean;
    end: () => void;
};
type CreateRuntimeSseHubDeps = {
    listRuntimeInstances: (input: {
        limit: number;
    }) => RuntimeInstanceRecord[];
};
export declare function createRuntimeSseHub(deps: CreateRuntimeSseHubDeps): {
    runtimeStreamSubscribers: Map<string, RuntimeStreamSubscriber>;
    writeRuntimeSseEvent: (subscriber: RuntimeStreamSubscriber, event: string, payload: unknown) => void;
    stopRuntimeStreamTimers: () => void;
    broadcastRuntimeSse: (event: string, payload: unknown) => void;
    ensureRuntimeStreamTimers: () => void;
};
export {};