how to hash very large files

async function crypto_hash(filepath: string) {
  const file_buffer = await Deno.readFile(filepath)
  const hash_buffer = await crypto.subtle.digest('SHA-256', file_buffer)
  const hash_array = Array.from(new Uint8Array(hash_buffer))
  const hash_hex = hash_array.map((b) => b.toString(16).padStart(2, '0')).join('')
  return hash_hex
}