export declare class CopilotStreamIdleError extends Error {
    readonly timeoutMs: number;
    constructor(timeoutMs: number, stage?: string, requestBytes?: number);
}
/** A request-local byte-idle bound; the native adapter separately bounds semantic silence. */
export declare class CopilotStreamLiveness {
    private readonly timeoutMs;
    private readonly controller;
    private timer;
    private disposed;
    private paused;
    private stage;
    private requestBytes;
    readonly signal: AbortSignal;
    constructor(timeoutMs: number, upstream: AbortSignal);
    pulse(): void;
    beginRequest(body?: string): void;
    pause(): void;
    resume(): void;
    observe(response: Response): Response;
    dispose: () => void;
}
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