JsOptimizer::optimize

public JsOptimizer::optimize(array $js_asset)

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))) {
    $data = Unicode::substr(Unicode::convertToUtf8($data, $encoding), 1);
  }
  // If no BOM is found, check for the charset attribute.
  elseif (isset($js_asset['attributes']['charset'])) {
    $data = Unicode::convertToUtf8($data, $js_asset['attributes']['charset']);
  }

  // No-op optimizer: no optimizations are applied to JavaScript assets.
  return $data;
}