/**
 * The control-surface broker floor (SPEC §13.12, D10).
 *
 * The endpoint surface REQUIRES NATS server >= 2.12: message schedules back durable timers,
 * and per-subject create-CAS backs canonical acceptance. There is no sweeper fallback and no
 * degraded mode; below the floor (or when a required capability is absent, e.g. the
 * offline-assets downgrade) startup fails loud. Only 2.12 schedule semantics may be assumed
 * (same-subject replacement) — never the 2.14 stop-plus-publish path.
 */
/** The minimum broker for the endpoint control surface. Runtime-frozen (the afa715b class): a
 *  post-import `minor = 0` would silently bypass the mandatory 2.12 startup gate. */
export declare const BROKER_FLOOR: Readonly<{
    readonly major: 2;
    readonly minor: 12;
}>;
/** Structural slice of a NATS connection: the pre-auth INFO carries the server version. */
export interface BrokerInfoSource {
    info?: {
        version?: string;
    };
}
/** Parse a nats-server version string ("2.12.3", "2.12.0-beta.1") into comparable parts. */
export declare function parseServerVersion(v: string): {
    major: number;
    minor: number;
    patch: number;
} | null;
/** True iff the version meets the control-surface floor. */
export declare function meetsBrokerFloor(version: string): boolean;
/** Startup gate: throw (loud, fail-closed) unless the connected broker meets the floor.
 *  Call before creating or serving any control-surface resource. A missing/unparseable
 *  version is a refusal, not a pass — no fallbacks. */
export declare function requireBrokerFloor(nc: BrokerInfoSource): void;
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