export declare class HeaderRecord {
    /**
     * the product that created the file, e.g., @(#) IBM SPSS STATISTICS 64-bit MS Windows 23.0.0.0
     */
    product: string;
    /**
     * placeholder: populates later with info record (todo- better docs on this)
     */
    encoding: string;
    /**
     * I don't know what the layout code is. Somewhere I saw it suggested
     * that it determines endianness, but I thought info records determined that.
     */
    layout_code: number;
    /**
     * Number of data elements per case. This is the number of variables, except that long string variables
     * add extra data elements (one for every 8 characters after the first 8). When reading system files,
     * PSPP will use this value unless it is set to -1, in which case it will determine the number of data
     * elements by context. When writing system files PSPP always uses this value.
     */
    case_size: number;
    /**
     * true if the data in the file is compressed, false otherwise.
     */
    compressed: boolean;
    /**
     * Set to 0 if the data in the file is not compressed, 1 if the data is compressed with simple
     * bytecode compression, 2 if the data is ZLIB compressed. This field has value 2 if and only
     * if rec_type is ‘$FL3’.
     */
    compression: any;
    /**
     * If one of the variables in the data set is used as a weighting variable, set to the index of that
     * variable. Otherwise, set to 0.
     */
    weightIndex: number;
    /**
     * Set to the number of cases in the file if it is known, or -1 otherwise.
     * In the general case it is not possible to determine the number of cases that will be output to a
     * system file at the time that the header is written. The way that this is dealt with is by writing
     * the entire system file, including the header, then seeking back to the beginning of the file and
     * writing just the ncases field. For 'files' in which this is not valid, the seek operation fails.
     * In this case, ncases remains -1.
     */
    n_cases: number;
    /**
     * Compression bias. Always set to 100. The significance of this value is that only numbers between
     * (1 - bias) and (251 - bias) can be compressed.
     */
    bias: number;
    /**
     * (9 chars)
     * Set to the date of creation of the system file, in dd mmm yy format, with the month as
     * standard English abbreviations, using an initial capital letter and following with lowercase.
     * If the date is not available then this field is arbitrarily set to 01 Jan 70.
     */
    creationDate: string;
    /**
     * (8 chars)
     * Set to the time of creation of the system file, in hh:mm:ss format and using 24-hour time. If the
     * time is not available then this field is arbitrarily set to 00:00:00.
     */
    creationTime: string;
    /**
     * Amalgamation of creationDate and creationTime
     */
    created: Date;
    /**
     * (64 chars)
     * Set the the file label declared by the user, if any. Padded on the right with spaces.
     */
    fileLabel: string;
    /**
     * placeholder: populates var name during metadata post-process via lookup using weightIndex
     */
    weight: string;
    /**
     * placeholder: populates during metadata post-process after string-continuation vars are deleted
     */
    n_vars: number;
    static read(reader: any): Promise<HeaderRecord>;
}