export type AuthType = 'api_key' | 'oauth';
export type PoolStrategy = 'fill_first' | 'round_robin' | 'random' | 'least_used';
export type CredentialStatus = 'ok' | 'exhausted';
export interface PooledCredential {
    provider: string;
    id: string;
    label?: string;
    authType: AuthType;
    priority: number;
    source: string;
    accessToken: string;
    refreshToken?: string;
    lastStatus: CredentialStatus;
    lastStatusAt: number;
    lastErrorCode?: number;
    expiresAt?: number;
    requestCount: number;
    extra: Record<string, unknown>;
}
export interface CredentialStats {
    id: string;
    label?: string;
    source: string;
    requestCount: number;
    lastStatus: CredentialStatus;
    lastStatusAt: number;
    isExhausted: boolean;
    exhaustedUntil?: number;
}
declare const EXHAUSTED_TTL_429_SECONDS = 3600;
declare const EXHAUSTED_TTL_DEFAULT_SECONDS = 3600;
export declare class CredentialPool {
    private provider;
    private entries;
    private currentIndex;
    private leaseCounts;
    private strategy;
    constructor(provider: string, entries: PooledCredential[], strategy?: PoolStrategy);
    get providerName(): string;
    get size(): number;
    select(): PooledCredential | null;
    markFailed(credentialId: string, statusCode?: number): void;
    markRateLimited(credentialId: string, retryAfterSeconds?: number): void;
    markSuccess(credentialId: string): void;
    acquireLease(credentialId: string, maxConcurrent?: number): string | null;
    releaseLease(credentialId: string): void;
    resetStatuses(): void;
    addEntry(entry: PooledCredential): void;
    removeEntry(credentialId: string): boolean;
    getStats(): CredentialStats[];
    getEntry(credentialId: string): PooledCredential | null;
    private availableEntries;
    private isExhausted;
}
export declare function createCredential(provider: string, apiKey: string, opts?: Partial<Omit<PooledCredential, 'provider' | 'accessToken'>>): PooledCredential;
export declare function loadPoolFromEnv(provider: string): CredentialPool;
export { EXHAUSTED_TTL_429_SECONDS, EXHAUSTED_TTL_DEFAULT_SECONDS };
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