class Helper implements

mixed getParameterOption(string|array $values, mixed $default = false, bool $onlyParams = false)

string getCellHeaderFormat() Gets header cell format.

bool isMultiselect() Returns whether the choices are multiselect.

progressFinish() Finishes the progress output.

addArguments(InputArgument[] $arguments

class HelperSet implements IteratorAggregate

TableStyle setPadType(int $padType)

callable wrapCallback(OutputInterface

progressStart(int $max) Starts the progress output.