/**
 * Formats seconds as '<hours> h'
 * @param seconds
 */
export declare function formatHours(seconds: number): string;
/**
 * Takes a string and puts some lines under it:
 * 'foo' ==> 'foo\n---'
 * @param str
 */
export declare function underline(str: string, pattern?: string): string;
export declare enum TableFormat {
    csv = "csv",
    ascii = "ascii"
}
interface ColumnDefinitionOptions {
    label: string;
    valueFormatter?: (val: any, format: TableFormat) => string;
}
interface FormatArgs<T> {
    data: T[];
    columns: Array<[keyof T, string | ColumnDefinitionOptions]>;
    format: TableFormat;
}
/**
 * Formats an array of objects as a tabular string representation based on the provided `format`
 * @param items An array of data, where the array items are used as rows and the properties as columns
 * @param columns defines the order and the names of the table columns
 * @param format the output format: csv, ascii
 */
export declare function formatDataTable<T>({ columns, format, data }: FormatArgs<T>): string;
export {};
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