export interface NonceEntry {
    nonce: string;
    address: string;
    expiresAt: number;
    used: boolean;
}
export interface MemoryNonceStoreOptions {
    ttlMs?: number;
    nonceFactory?: () => string;
    now?: () => number;
}
export declare class MemoryNonceStore {
    #private;
    constructor(options?: MemoryNonceStoreOptions);
    issue(address: string): string;
    peek(nonce: string): NonceEntry | null;
    consume(nonce: string, address: string): boolean;
    sweepExpired(now?: number): void;
    clear(): void;
}
export declare function createMemoryNonceStore(options?: MemoryNonceStoreOptions): MemoryNonceStore;
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