protected function resolveInstaller(): ?string
    {
        $value = $this->getModuleInfo()['installer'] ?? null;

        return is_string($value) ? $value : null;
    }
protected function resolveInstaller(): ?string
    {
        $value = $this->getModuleInfo()['installer'] ?? null;

        return is_string($value) ? $value : null;
    }
protected function resolveInstaller ( ) : ? string { $ value = $ this -> getModuleInfo ( ) [ 'installer' ] ?? null ; return is_string ( $ value ) ? $ value : null ; }
Resolve installer class

@return string|null
Resolve installer class