export declare class Env {
    readonly OPENAI_API_KEY?: string;
    readonly GPT_MODEL?: string;
    readonly CONTEXT_WINDOW_TOKENS?: number;
    readonly MAX_RESPONSE_TOKENS?: number;
    readonly SERP_API_KEY?: string;
    readonly OPENAI_API_BASE_URL?: string;
    constructor(envVars: Record<string, string | undefined>);
}
