Add a js to a specific page from a module in Drupal

mymodule.module

function mymodule_preprocess_page(&$variables) {
  if (isset($variables['node']) && $variables['node']->type == 'book') {
    // Add js
    drupal_add_js(drupal_get_path('module', 'mymodule') . '/mymodule.awesome.js');
    $variables['scripts'] = drupal_get_js();
  }
}