Electron.NET/ElectronNET.WebApp/ElectronHostHook/excelCreator.ts

import * as Excel from "exceljs";
import { Workbook, Worksheet } from "exceljs";

export class ExcelCreator {
    async create(path: string): Promise<string> {
        const workbook: Workbook = new Excel.Workbook();
        const worksheet: Worksheet = workbook.addWorksheet("My Sheet");
        worksheet.columns = [
            { header: "Id", key: "id", width: 10 },
            { header: "Name", key: "name", width: 32 },
            { header: "Birthday", key: "birthday", width: 10, outlineLevel: 1 }
        ];
        worksheet.addRow({ id: 1, name: "John Doe", birthday: new Date(1970, 1, 1) });
        worksheet.addRow({ id: 2, name: "Jane Doe", birthday: new Date(1965, 1, 7) });

        await workbook.xlsx.writeFile(path + "\\sample.xlsx");

        return "Excel file created!";
    }
}