import { ExcelData } from '../dto/excel-data.dto';
export declare class ExcelHelper {
    static getHeader(filePath: string, sheetName: string): string[];
    static readExcel(filePath: string, rowLevel: string, sheetName: string): string[][];
    static getRowData(filePath: string, sheetName: string): string[][];
    static getJSONStringFromList(header: string[], rowData: string[][]): string;
    static getDataObjectListFromXLS<T>(filePath: string, sheetName: string, classType: new () => T): T[];
    static writeExcel(excelData: ExcelData): void;
}