/// <reference types="node" />
import "core-js/modules/es.promise";
import "core-js/modules/es.string.includes";
import "core-js/modules/es.object.assign";
import "core-js/modules/es.object.keys";
import "core-js/modules/es.symbol";
import "core-js/modules/es.symbol.async-iterator";
import "regenerator-runtime/runtime";
import { AddWorksheetOptions, Buffer, Workbook as IWorkbook } from "exceljs";
import * as stream from "stream";
import { WorksheetUtils } from "../pkg/worksheet.utils";
export declare class ExcelService {
    protected workbook: IWorkbook;
    protected workSheetMap: Map<string, WorksheetUtils>;
    loadTemplate(templatePath: string): Promise<this>;
    loadFromBuffer(buffer: Buffer): Promise<this>;
    addWorkSheet(workSheetName: string, options?: Partial<AddWorksheetOptions>): WorksheetUtils;
    getWorkSheet(workSheetName: string): WorksheetUtils;
    writeToStream(readStream: stream.Stream): Promise<void>;
    writeToFile(path: string): Promise<void>;
    write(stream: stream.Stream): Promise<void>;
    writeToBuffer(): Promise<Buffer>;
    removeWorkSheet(worksheet: WorksheetUtils): void;
    protected throwIfTemplateNotLoaded(): void;
}