export declare class PiAiFirstEventTimeoutError extends Error {
    readonly timeoutMs: number;
    readonly provider: string;
    readonly model: string;
    /** Which watchdog phase fired: 'first' = no event before the initial deadline; 'inter' = stream stalled mid-response. */
    readonly phase: 'first' | 'inter';
    constructor(params: {
        timeoutMs: number;
        provider: string;
        model: string;
        phase?: 'first' | 'inter';
    });
}
export declare function resolveFirstEventTimeoutMs(): number;
export declare function startFirstEventWatchdog(callerSignal?: AbortSignal, modelInfo?: {
    provider?: string;
    id?: string;
}): {
    signal: AbortSignal | undefined;
    onActivity: () => void;
    dispose: () => void;
    translateError: (err: unknown) => unknown;
};
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