import type { ChildProcess } from "node:child_process";
export declare class GatewayRequestError extends Error {
    readonly outcome: "rejected" | "unknown";
    constructor(outcome: "rejected" | "unknown", message: string);
}
export interface GatewayRequestCodec<T> {
    encode(requestId: string): unknown;
    decode(value: unknown, requestId: string): {
        ok: true;
        result: T;
    } | {
        ok: false;
        error: Error;
    } | undefined;
    errors: {
        unavailable: string;
        limit: string;
        invalid: string;
        timeout: string;
        send: string;
        closed: string;
    };
}
/** 实际child共享一个关联器，不重试；调用结束不代表远端SDK已取消。 */
export declare class GatewayRequestClient {
    private readonly child;
    private readonly timeoutMs;
    private readonly pending;
    private closed;
    constructor(child: ChildProcess, timeoutMs?: number);
    request<T>(codec: GatewayRequestCodec<T>): Promise<T>;
    close(): void;
    private readonly onClosed;
    private readonly onMessage;
    private reject;
}
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