export declare const spreadsheetUnderlineStyles: readonly ["none", "single", "double", "singleAccounting", "doubleAccounting"];
export type SpreadsheetUnderlineStyle = (typeof spreadsheetUnderlineStyles)[number];
export type SpreadsheetUnderlineCellValue = 0 | 1 | 2 | 3 | 4;
export declare function isSpreadsheetUnderlineStyle(value: unknown): value is SpreadsheetUnderlineStyle;
export declare function spreadsheetUnderlineCellValue(style: SpreadsheetUnderlineStyle): SpreadsheetUnderlineCellValue;
export declare function spreadsheetUnderlineStyle(value: unknown): SpreadsheetUnderlineStyle;
export declare function spreadsheetUnderlineCellValueFromXlsx(value: string | null): SpreadsheetUnderlineCellValue;
export declare function spreadsheetUnderlineCellValueFromSheetJs(value: unknown): SpreadsheetUnderlineCellValue;