/**
 * @license
 * Copyright 2025 Steven Roussey <sroussey@gmail.com>
 * SPDX-License-Identifier: Apache-2.0
 */
import type { CredentialPutOptions, ICredentialStore } from "./ICredentialStore";
/**
 * Credential store backed by environment variables.
 *
 * Keys are mapped to environment variable names via an explicit mapping
 * or an optional prefix convention. This store is read-only for env vars
 * that already exist, but `put` can be used to set them for the current
 * process lifetime.
 *
 * @example
 * ```ts
 * const store = new EnvCredentialStore({
 *   "anthropic-api-key": "ANTHROPIC_API_KEY",
 *   "openai-api-key": "OPENAI_API_KEY",
 * });
 * const key = await store.get("anthropic-api-key"); // reads process.env.ANTHROPIC_API_KEY
 * ```
 */
export declare class EnvCredentialStore implements ICredentialStore {
    private readonly keyToEnvVar;
    private readonly prefix;
    /**
     * @param mapping Explicit credential-key → env-var-name mapping
     * @param prefix Optional prefix: if a key has no explicit mapping, try `PREFIX_KEY` (uppercased, hyphens → underscores)
     */
    constructor(mapping?: Record<string, string>, prefix?: string);
    private resolveEnvVar;
    private getEnv;
    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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