export declare class DecisionSupersededError extends Error {
    readonly name = "DecisionSupersededError";
    constructor(matchId: string, kind?: "superseded" | "stopped");
}
/**
 * True when `signal` has fired with a DecisionSupersededError as its abort
 * reason — the deliberate supersede/stop cancel. Keying on the reason (R15
 * 2026-07-26), not on `aborted` alone, keeps the predicate meaningful for a
 * COMBINED signal (supersede signal + turn-deadline timeout): a timeout abort
 * carries a different reason and must NOT read as "discard this decision".
 */
export declare function isSupersededAbort(signal: AbortSignal | undefined): boolean;