1 system.api.php hook_library_info_alter(&$libraries, $module)

Alters the JavaScript/CSS library registry.

Allows certain, contributed modules to update libraries to newer versions while ensuring backwards compatibility. In general, such manipulations should only be done by designated modules, since most modules that integrate with a certain library also depend on the API of a certain library version.


$libraries: The JavaScript/CSS libraries provided by $module. Keyed by internal library name and passed by reference.

$module: The name of the module that registered the libraries.

See also


Related topics


core/modules/system/system.api.php, line 409
Hooks provided by Backdrop core and the System module.


function hook_library_info_alter(&$libraries, $module) {
  // Update Farbtastic to version 2.0.
  if ($module == 'system' && isset($libraries['farbtastic'])) {
    // Verify existing version is older than the one we are updating to.
    if (version_compare($libraries['farbtastic']['version'], '2.0', '<')) {
      // Update the existing Farbtastic to version 2.0.
      $libraries['farbtastic']['version'] = '2.0';
      $libraries['farbtastic']['js'] = array(
        backdrop_get_path('module', 'farbtastic_update') . '/farbtastic-2.0.js' => array(),