Download a in-memory content with a specific file type

download.ts

export function download({
  filename,
  content,
  contentType,
}: {
  content: string
  contentType: string
  filename: string
}) {
  const a = document.createElement("a")
  const file = new Blob([content], { type: contentType })
  const url = URL.createObjectURL(file)

  a.href = url
  a.download = filename
  a.click()

  setTimeout(() => {
    URL.revokeObjectURL(url)
  })
}