Angular export JSON to xlsx or any type

angular-json-to-xlsx.component.ts

/**
 * xlxs and file-saver example
 * https://dev.to/idrisrampurawala/exporting-data-to-excel-and-csv-in-angular-3643
 * https://github.com/SheetJS/sheetjs
 * install library
 * npm install --save xlsx file-saver
 * npm i --save-dev @types/file-saver
 */
import { Component, OnInit } from '@angular/core';
import * as FileSaver from 'file-saver';
import * as XLSX from 'xlsx';

interface Profile {
  firstname: string;
  lastname: string;
}

@Component({
  selector: 'app-test',
  template: `
    <div class="container">
      <h2>XLSX Example</h2>
      <button (click)="download('xlsx')">Download XLSX</button>
      <button (click)="download('csv')">Download CSV</button>
      <button (click)="download('any')">Download ANY</button>
      <pre>{{getDataString()}}</pre>
    </div>
  `,
  styles: [
    `
      .container {
        margin: 20px 20px;
      }
      h2 {
        color: navy;
        font-size: 20px;
        font-weight: bold;
      }
      button {
        margin: 5px 5px;
        padding: 10px 20px 10px 20px;
        background-color: #24788F;
        border-radius: 5px;
        color: white;
      }
    `
  ]
})
export class TestComponent implements OnInit {
  data: Profile[] = [
    {
      firstname: 'Araiva',
      lastname: 'viruskizz',
    }
  ];
  sheetName = 'Data';
  filename = 'example';
  constructor() { }

  ngOnInit(): void {
  }

  download(type: string): void {
    const worksheet = XLSX.utils.json_to_sheet(this.data, {});
    if (type === 'xlsx') {
      this.exportXlsx(worksheet);
    } else if (type === 'csv') {
      this.exportCsv(worksheet);
    } else {
      this.exportToAny(worksheet, 'csv');
    }
  }

  exportXlsx(worksheet: XLSX.WorkSheet): void {
    const fileExtension = '.xlsx';
    const workbook = XLSX.utils.book_new();
    XLSX.utils.book_append_sheet(workbook, worksheet, this.sheetName);
    // Automatic download with file-saver
    XLSX.writeFile(workbook, `${this.filename}${fileExtension}`);
  }

  exportToAny(worksheet: XLSX.WorkSheet, type: XLSX.BookType): void {
    const fileExtension = '.xlsx';
    const workbook = XLSX.utils.book_new();
    XLSX.utils.book_append_sheet(workbook, worksheet, this.sheetName);
    // Automatic download with file-saver
    XLSX.writeFile(workbook, `${this.filename}.${type}`, {
      bookType: type
    });
  }

  exportCsv(worksheet: XLSX.WorkSheet): void {
    const fileExtension = '.csv';
    const csv = XLSX.utils.sheet_to_csv(worksheet, {FS: ';'});
    const blob = new Blob([csv], {type: 'text/plain;charset=UTF-8'});
    FileSaver.saveAs(blob, `${this.filename}${fileExtension}`);
  }

  getDataString(): string {
    return JSON.stringify(this.data, null, 2);
  }
}