export declare class TokenPoolExhaustedError extends Error {
    tokens: Record<string, {
        code: number;
        message: string;
    }>;
    constructor(tokens: Record<string, {
        code: number;
        message: string;
    }>);
}
export declare class TokenPool {
    private states;
    constructor(...tokens: string[]);
    private preview;
    /** Anthropic & OpenAI SDKs both attach `status` to thrown errors */
    private statusCode;
    private retryAfter;
    run<T>(fn: (token: string) => Promise<T>): Promise<T>;
}