TYPO3 Core

Currently, extbase view resolvers must return fluid views. Fluid views need to implement `renderSection` and `renderPartial`. Those methods do not make sense for many views, such as json or xml views. The methods should not be required for all extbase views.

More technically, the return type of `\TYPO3\CMS\Extbase\Mvc\View\ViewResolverInterface::resolve` is `\TYPO3Fluid\Fluid\View\ViewInterface`.

`\TYPO3Fluid\Fluid\View\ViewInterface`:

…
    public function renderSection($sectionName, array $variables = [], $ignoreUnknown = false);
…
    public function renderPartial($partialName, $sectionName, array $variables, $ignoreUnknown = false);
…

```

Even the `\TYPO3\CMS\Extbase\Mvc\View\JsonView` is affected by this.

    public function renderSection($sectionName, array $variables = [], $ignoreUnknown = false)
    {
        // No-op: renderSection does not make sense for this view
        return '';
    }

    public function renderPartial($partialName, $sectionName, array $variables, $ignoreUnknown = false)
    {
        // No-op: renderPartial does not make sense for this view
        return '';
    }

Suggestion: Use an Extbase specific view interface which only requires the following methods:

• assign
• assignMultiple
• render

Alternatively, use the `\TYPO3\CMS\Core\View\ViewInterface` instead.