/**
 * Credential storage for API keys and OAuth tokens.
 * Handles loading, saving, and refreshing credentials from auth.json.
 */
import type { AuthCredential, OAuthLoginCallbacks, OAuthProviderId, OAuthProviderInterface } from './types.js';
/**
 * Best/default models for each OAuth provider.
 * Used when auto-selecting a model after login.
 */
export declare const PROVIDER_DEFAULT_MODELS: Record<OAuthProviderId, string>;
/**
 * Get an OAuth provider by ID
 */
export declare function getOAuthProvider(id: OAuthProviderId): OAuthProviderInterface | undefined;
/**
 * Get all registered OAuth providers
 */
export declare function getOAuthProviders(): OAuthProviderInterface[];
/**
 * Credential storage backed by a JSON file.
 */
export declare class AuthStorage {
    private authPath;
    private data;
    constructor(authPath?: string);
    /**
     * Reload credentials from disk.
     */
    reload(): void;
    /**
     * Save credentials to disk.
     */
    private save;
    /**
     * Get credential for a provider.
     */
    get(provider: string): AuthCredential | undefined;
    /**
     * Set credential for a provider.
     */
    set(provider: string, credential: AuthCredential): void;
    /**
     * Remove credential for a provider.
     */
    remove(provider: string): void;
    /**
     * List all providers with credentials.
     */
    list(): string[];
    /**
     * Check if credentials exist for a provider.
     */
    has(provider: string): boolean;
    /**
     * Check if logged in via OAuth for a provider.
     */
    isLoggedIn(provider: string): boolean;
    /**
     * Check if a stored API key exists for a provider.
     * Keys are stored under `apikey:<provider>` in auth.json.
     */
    hasStoredApiKey(provider: string): boolean;
    /**
     * Get a stored API key for a provider, if any.
     */
    getStoredApiKey(provider: string): string | undefined;
    /**
     * Store an API key for a provider.
     * Also sets the corresponding environment variable so model resolution can find it.
     */
    setStoredApiKey(provider: string, key: string, envVar?: string): void;
    /**
     * Load all stored API keys into process.env.
     * Called at startup so model resolution can find stored keys.
     * Only sets env vars that aren't already set (env vars take precedence).
     */
    loadStoredApiKeysIntoEnv(providerEnvVars: Record<string, string | undefined>): void;
    /**
     * Login to an OAuth provider.
     */
    login(providerId: OAuthProviderId, callbacks: OAuthLoginCallbacks): Promise<void>;
    /**
     * Logout from a provider.
     */
    logout(provider: string): void;
    /**
     * Get API key for a provider, auto-refreshing OAuth tokens if needed.
     */
    getApiKey(providerId: string): Promise<string | undefined>;
}
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