import { FilePurpose } from "../resources.js";
export declare class InvalidFileFormatError extends Error {
    line_number: number | null;
    error_source: string | null;
    constructor(message?: string, line_number?: number | null, error_source?: string | null);
}
export interface CheckFileReport {
    is_check_passed: boolean;
    message: string;
    found?: boolean | null;
    file_size?: number | null;
    utf8?: boolean | null;
    line_type?: boolean | null;
    text_field?: boolean | null;
    key_value?: boolean | null;
    has_min_samples?: boolean | null;
    num_samples?: number | null;
    load_json?: boolean | null;
    load_csv?: boolean | null;
    load_parquet?: string | null;
    filetype?: string;
    line_number?: number;
    format?: boolean;
}
export declare function checkFile(file: string, purpose?: FilePurpose | string): Promise<CheckFileReport>;
export declare function validate_messages(messages: Array<Record<string, string | boolean>>, idx: number, require_assistant_role?: boolean): void;
export declare function validate_preference_openai(example: Record<string, any>, idx?: number): void;
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