function JsOptimizer::addDnsPrefetch

Extract any domains to prefetch DNS.

Parameters

array $asset: A core asset definition array.

Return value

array An array of domains to prefetch.

Overrides AssetOptimizer::addDnsPrefetch

File

src/Asset/JsOptimizer.php, line 25

Class

JsOptimizer

The JavaScript Optimizer.

Namespace

Drupal\advagg\Asset

Code

protected function addDnsPrefetch(array $asset) {
    // Check if Google Ad Manager and add DNS prefetch.
    $prefetch = $this->testForGoogleAdManager($asset['data']);
    // Check if Google Analytics and add DNS prefetch.
    $prefetch += $this->testForGoogleAnalytics($asset['data']);
    return $prefetch;
}