function JsOptimizer::optimize

Overrides AssetOptimizerInterface::optimize

File

core/lib/Drupal/Core/Asset/JsOptimizer.php, line 15

Class

JsOptimizer

Optimizes a JavaScript asset.

Namespace

Code

public function optimize(array $js_asset) {
    if ($js_asset['type'] !== 'file') {
        throw new \Exception('Only file JavaScript assets can be optimized.');
    }
    if (!$js_asset['preprocess']) {
        throw new \Exception('Only file JavaScript assets with preprocessing enabled can be optimized.');
    }
    // If a BOM is found, convert the file to UTF-8, then use substr() to
    // remove the BOM from the result.
    $data = file_get_contents($js_asset['data']);
    if ($encoding = Unicode::encodingFromBOM($data)) {
        $data = mb_substr(Unicode::convertToUtf8($data, $encoding), 1);
    }
    elseif (isset($js_asset['attributes']['charset'])) {
        $data = Unicode::convertToUtf8($data, $js_asset['attributes']['charset']);
    }
    // No-op optimizer: no optimizations are applied to JavaScript assets.
    return $data;
}