/**
 * AgentGuard(TM) Spend: In-memory spend store
 *
 * Reference implementation of the SpendStore interface. Suitable for tests,
 * examples, and single-process shadow deployments. Production callers with
 * multi-process or distributed workloads should supply their own store
 * (typically Redis with INCR, or Postgres with SELECT FOR UPDATE).
 *
 * Licensed under the alpha evaluation license; see LICENSE in the package
 * root. Patent notice: Protected by U.S. patent-pending technology
 * (App. Nos. 63/983,615; 63/983,621; 63/983,843; 63/984,626;
 * 64/071,781; 64/071,789).
 */
import type { SpendStore, SpendWindow } from './types';
export declare const WINDOW_DURATION_MS: Record<SpendWindow, number>;
/**
 * Returns the millisecond timestamp at which a window of the given duration
 * containing `nowMs` started. For fixed-grid windows we align to UTC epoch
 * (so all processes agree on window boundaries without coordination).
 */
export declare function windowStart(window: SpendWindow, nowMs: number): number;
/**
 * In-memory spend store. Thread-safe in single-process Node (we rely on the
 * event loop's atomic execution between awaits; this store does no I/O).
 */
export declare class InMemorySpendStore implements SpendStore {
    private state;
    private key;
    private rollIfStale;
    getWindowSpend(scopeKey: string, window: SpendWindow): Promise<number>;
    incrementWindowSpend(scopeKey: string, window: SpendWindow, cents: number): Promise<number>;
    reserveWindowSpend(scopeKey: string, window: SpendWindow, cents: number, limitCents: number): Promise<{
        allowed: boolean;
        before: number;
        after: number;
    }>;
    settleWindowSpend(scopeKey: string, window: SpendWindow, deltaCents: number): Promise<number>;
    /** Clear all state. Test helper. */
    reset(): void;
}
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