/**
 * [WHO]: Provides waitForAbortableOperation(), waitForAssistantStream(), waitForAssistantStreamEvent()
 * [FROM]: Depends on @catui/ai AssistantMessageEvent/AssistantMessageEventStream contracts.
 * [TO]: Consumed by standard and structured-adaptive agent loops.
 * [HERE]: core/lib/agent-core/src/agent-loop-stream-events.ts within agent-core; shared abortable operation and assistant-stream iterator utilities.
 */
import type { AssistantMessageEvent } from "@catui/ai/types";
import type { AssistantMessageEventStream } from "@catui/ai/events";
export type AssistantStreamNext = IteratorResult<AssistantMessageEvent> | "aborted";
export type AssistantStreamStart = AssistantMessageEventStream | "aborted";
export type AbortableOperationResult<T> = {
    type: "resolved";
    value: T;
} | {
    type: "aborted";
};
export declare function waitForAbortableOperation<T>(valueOrPromise: T | Promise<T>, signal?: AbortSignal): Promise<AbortableOperationResult<T>>;
export declare function waitForAssistantStream(streamOrPromise: AssistantMessageEventStream | Promise<AssistantMessageEventStream>, signal?: AbortSignal): Promise<AssistantStreamStart>;
export declare function waitForAssistantStreamEvent(iterator: AsyncIterator<AssistantMessageEvent>, signal?: AbortSignal): Promise<AssistantStreamNext>;