/**
* Return merged assets, if merging is enabled for a given content type
*
* @param MergeableInterface[] $assets
* @param string $contentType
* @return array|\Iterator
* @throws \InvalidArgumentException
*/
public function getMergedAssets(array $assets, $contentType)
{
$isCss = $contentType == 'css';
$isJs = $contentType == 'js';
if (!$isCss && !$isJs) {
throw new \InvalidArgumentException("Merge for content type '{$contentType}' is not supported.");
}
$isCssMergeEnabled = $this->config->isMergeCssFiles();
$isJsMergeEnabled = $this->config->isMergeJsFiles();
if ($isCss && $isCssMergeEnabled || $isJs && $isJsMergeEnabled) {
$mergeStrategyClass = \Magento\Framework\View\Asset\MergeStrategy\FileExists::class;
if ($this->state->getMode() === \Magento\Framework\App\State::MODE_DEVELOPER) {
$mergeStrategyClass = \Magento\Framework\View\Asset\MergeStrategy\Checksum::class;
}
$mergeStrategy = $this->objectManager->get($mergeStrategyClass);
$assets = $this->objectManager->create('Magento\\Framework\\View\\Asset\\Merged', ['assets' => $assets, 'mergeStrategy' => $mergeStrategy]);
}
return $assets;
}
