code: func Base64Encode(str cty.Value) (cty.Value, error) {
  	return Base64EncodeFunc.Call([]cty.Value{str})
  }
docs: // Base64Encode applies Base64 encoding to a string.
  //
  // Terraform uses the "standard" Base64 alphabet as defined in RFC 4648 section 4.
  //
  // Strings in the Terraform language are sequences of unicode characters rather
  // than bytes, so this function will first encode the characters from the string
  // as UTF-8, and then apply Base64 encoding to the result.