$type * @return T&FieldInterface */ public function createField(string $type, string $name, ?string $label = null): FieldInterface; /** * @template T * @param class-string $type * @return T&ContainerInterface */ public function createContainer(string $type, string $name, ?string $label = null): ContainerInterface; /** * Modifies the current Form Component by changing any properties * that were passed in $structure. If a component supports special * indices in $structure (for example a "fields" property) then * that component may specify its own `modify()` method and manually * process each of the specially supported keywords. * * For example, the AbstractFormContainer supports passing "fields" * and each field is then attempted fetched from children. If not * found, it is created (and the structure passed to the `create()` * function which uses the same structure syntax). If it already * exists, the `modify()` method is called on that object to trigger * the recursive modification of all child components. */ public function modify(array $structure): self; }