Small TypeScript helper to export a html table content as a .csv file

csv.helper.ts

export class CSVHelper {

  public exportFromTable(table, filename): void {
    let csv = [],
        tableRows = table.querySelectorAll("tr")

    for (let i = 0; i < tableRows.length; i++) {
      let row = [],
          cols = tableRows[i].querySelectorAll("td, th")

      for (let j = 0; j < cols.length; j++) {
        row.push(cols[j].innerHTML)
      }

      csv.push(row.join(","))
    }

    this.downloadCsv( csv.join("\n"), filename )
  }

  private downloadCsv(csv, filename): void {
    let csvFile,
        downloadLink,
        date = this.currentDate()

    csvFile = new Blob([csv], {type: "text/csv"})
    downloadLink = document.createElement("a")
    downloadLink.download = date+'-'+filename
    downloadLink.href = window.URL.createObjectURL(csvFile)
    downloadLink.style.display = "none"
    document.body.appendChild(downloadLink)
    downloadLink.click()
  }

  private currentDate(): string {
    let dateNow = new Date(Date.now()),
        month = '' + (dateNow.getMonth() + 1),
        day = '' + dateNow.getDate(),
        year = dateNow.getFullYear()

    if (month.length < 2) month = '0' + month
    if (day.length < 2) day = '0' + day

    return [year, month, day].join('-')
  }

}