/**
 * In-memory storage backend for the rate limiter. Tracks integer counters
 * per key with optional TTL expiry. Ported to TypeScript from the upstream
 * MemoryStorage class. See `THIRDPARTY-LICENSES.md` for attribution.
 */
import { LimiterResult } from './types';
import { StorageRecord } from './record';
export declare class MemoryStorage {
    private _storage;
    /**
     * Increment the counter for `key` by `value`. If the key has no record
     * (or its TTL has expired), a new record is created with `durationSec`
     * lifetime.
     */
    incrby(key: string, value: number, durationSec: number): LimiterResult;
    /**
     * Write the counter for `key` to `value`, replacing any existing
     * record. `durationSec` of 0 means "never expires".
     */
    set(key: string, value: number, durationSec: number): LimiterResult;
    get(key: string): LimiterResult | null;
    delete(key: string): boolean;
    /** Inspect the underlying map. Test-only and not part of the public API. */
    _dump(): IterableIterator<[string, StorageRecord]>;
    /** Clear all records. Used by tests and by `Limiter.dispose()`. */
    clear(): void;
}
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