/**
 * @license
 * Copyright 2026 Steven Roussey <sroussey@gmail.com>
 * SPDX-License-Identifier: Apache-2.0
 */
import type { IHumanConnector, IHumanRequest, IHumanResponse } from "@workglow/util";
import type { RunEventSink } from "./runEventChannel";
/** Opens a reader for answers, returning how to stop it. */
export type AnswerReaderFactory = (onLine: (line: string) => void) => (() => void) | undefined;
/**
 * Asks the human by writing the request to the run's event stream and waiting
 * for a matching line on stdin. The parent bridges both ends to a browser.
 *
 * An aborted run resolves as `cancel` rather than rejecting: a child blocked on
 * a question nobody is reading any more has to end, and a rejection here would
 * surface as a task failure rather than as the cancellation it is.
 */
export declare class RunEventHumanConnector implements IHumanConnector {
    private readonly sink;
    private readonly openReader?;
    private readonly pending;
    /** Live answer reader, held only while at least one request is outstanding. */
    private stopReader;
    constructor(sink: RunEventSink, openReader?: AnswerReaderFactory | undefined);
    /**
     * The reader is opened per outstanding request and released with the last one.
     *
     * Kept open for the life of the process it does exactly one thing beyond
     * reading: it holds the event loop, so a child that has finished its work
     * never exits. Nothing observes that on a terminal — the command has already
     * printed — but the web console ends a run on the child's exit, so every
     * command that asked nothing hung there forever while having done its job in
     * a second.
     */
    private acquireReader;
    private releaseReader;
    send(request: IHumanRequest, signal: AbortSignal): Promise<IHumanResponse>;
    followUp(request: IHumanRequest, _previous: IHumanResponse, signal: AbortSignal): Promise<IHumanResponse>;
    /** One NDJSON line from the parent, shaped like an {@link IHumanResponse}. */
    feedHumanResponseLine(line: string): void;
}