/**
 * @license
 * Copyright 2025 Steven Roussey <sroussey@gmail.com>
 * SPDX-License-Identifier: Apache-2.0
 */
import type { CredentialPutOptions, ICredentialStore } from "./ICredentialStore";
/**
 * A credential store that chains multiple stores together, trying each
 * in order until a value is found.
 *
 * Writes always go to the first (primary) store. Reads cascade through
 * the chain, returning the first match. This enables layered resolution:
 * explicit config → encrypted store → environment variables.
 *
 * @example
 * ```ts
 * const store = new ChainedCredentialStore([
 *   new InMemoryCredentialStore(),  // runtime overrides
 *   new EncryptedKvCredentialStore(kv, passphrase),  // persistent encrypted
 *   new EnvCredentialStore({ ... }),  // environment fallback
 * ]);
 * ```
 */
export declare class ChainedCredentialStore implements ICredentialStore {
    private readonly stores;
    constructor(stores: readonly ICredentialStore[]);
    get(key: string): Promise<string | undefined>;
    put(key: string, value: string, options?: CredentialPutOptions): Promise<void>;
    delete(key: string): Promise<boolean>;
    has(key: string): Promise<boolean>;
    keys(): Promise<readonly string[]>;
    deleteAll(): Promise<void>;
}
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