/** * 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; }