class DialogHelper extends

bool isRequired() Returns true if the argument is required.

TableStyle setCellRowFormat(string $cellRowFormat)

setFormatter(

array getNamespaces() Return Value array

class JsonDescriptor extends

static TableStyle getStyleDefinition(string

listing(array $elements) Formats a list. Parameters

string getName() Returns the canonical name of this helper.

write(string|array $messages, bool $newline = false, int $options = self::OUTPUT_NORMAL) Writes a