$flash->success("The record was successfully deleted");
$flash->error("Cannot open the file");

/**
 * @var bool
 */
protected autoescape = true;

/**
 * @var bool
 */
protected automaticHtml = true;

/**
 * @var array
 */
protected cssClasses;

/**
 * @var string
 */
protected customTemplate = ;

/**
 * @var EscaperInterface | null
 */
protected escaperService;

/**
 * @var bool
 */
protected implicitFlush = true;

/**
 * @var array
 */
protected messages;

/**
 * @var SessionInterface | null
 */
protected sessionService;

public function __construct( EscaperInterface $escaper = null, SessionInterface $session = null );

public function clear(): void;

public function error( string $message ): string | null;

$flash->error("This is an error");

public function getAutoescape(): bool

public function getCssClasses(): array

public function getCustomTemplate(): string

public function getEscaperService(): EscaperInterface;

public function notice( string $message ): string | null;

$flash->notice("This is an information");

public function outputMessage( string $type, mixed $message );

$flash->outputMessage("error", $message);

public function setAutoescape( bool $autoescape ): FlashInterface;

public function setAutomaticHtml( bool $automaticHtml ): FlashInterface;

public function setCssClasses( array $cssClasses ): FlashInterface;

public function setCustomTemplate( string $customTemplate ): FlashInterface;

public function setEscaperService( EscaperInterface $escaperService ): FlashInterface;

public function setImplicitFlush( bool $implicitFlush ): FlashInterface;

public function success( string $message ): string | null;

$flash->success("The process was finished successfully");

public function warning( string $message ): string | null;

$flash->warning("Hey, this is important");

public function message( string $type, mixed $message ): string | null;

public function output( bool $remove = bool ): void;

public function error( string $message ): string | null;

public function message( string $type, string $message ): string | null;

public function notice( string $message ): string | null;

public function success( string $message ): string | null;

public function warning( string $message ): string | null;

public function clear(): void;

public function getMessages( mixed $type = null, bool $remove = bool ): array;

public function getSessionService(): ManagerInterface;

public function has( mixed $type = null ): bool;

public function message( string $type, string $message ): string | null;

public function output( bool $remove = bool ): void;

protected function getSessionMessages( bool $remove, mixed $type = null ): array;

protected function setSessionMessages( array $messages ): array;