import type { ObjectWithKeysFromStringArray, StoreBaseConfig } from '@purista/core';
import { ConfigStoreBaseClass } from '@purista/core';
import type { KV, NatsConnection } from 'nats';
import type { NatsConfigStoreConfig } from './types/NatsConfigStoreConfig.js';
/**
 * Config store backed by a NATS JetStream key-value bucket.
 *
 * JetStream must be enabled on the NATS server. Values are encoded with the NATS
 * `JSONCodec`, so stored values must be JSON-compatible. This store keeps only
 * the NATS connection and KV bucket handle in memory; values are read from the
 * bucket for each operation.
 *
 * The default bucket is `purista-config-store`. Use tenant-aware keys such as
 * `tenant.acme.prod.payments.public-api-url`, and configure NATS credentials via
 * connection options or your runtime environment.
 *
 * @example
 * ```typescript
 * const store = new NatsConfigStore({
 *   servers: 'nats://localhost:4222',
 *   keyValueStoreName: 'purista-config-store',
 * })
 *
 * await store.setConfig('tenant.acme.prod.app.features', { checkout: true })
 * const config = await store.getConfig('tenant.acme.prod.app.features')
 * await store.destroy()
 * ```
 */
export declare class NatsConfigStore extends ConfigStoreBaseClass<NatsConfigStoreConfig> {
    /**
     * Active NATS connection, created lazily by `getStore`.
     */
    connection: NatsConnection | undefined;
    /**
     * JSON codec used to encode and decode values in the key-value bucket.
     */
    sc: import("nats").Codec<unknown>;
    /**
     * Cached JetStream key-value bucket handle.
     */
    kv: KV | undefined;
    /**
     * Creates a NATS JetStream-backed config store.
     *
     * @param config Store options plus NATS connection and KV bucket options.
     */
    constructor(config?: StoreBaseConfig<Partial<NatsConfigStoreConfig>>);
    /**
     * Returns a healthy JetStream key-value bucket handle.
     *
     * Reconnects when the previous connection was closed or is draining.
     */
    getStore(): Promise<KV>;
    protected getConfigImpl<ConfigNames extends string[]>(...stateNames: ConfigNames): Promise<ObjectWithKeysFromStringArray<ConfigNames>>;
    protected removeConfigImpl(stateName: string): Promise<void>;
    protected setConfigImpl(stateName: string, stateValue: unknown): Promise<void>;
    /**
     * Drains and closes the NATS connection and clears cached handles.
     *
     * Call this during application shutdown.
     */
    destroy(): Promise<void>;
}
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