old_contents: Package.describe({
    summary: "Simple templates to add login widgets to an app."
  });
  
  Package.on_use(function (api) {
    api.use('accounts-ui-unstyled', 'client');
    api.use('less', 'server');
  
    api.add_files(['login_buttons.less'], 'client');
  });
  
new_contents: Package.describe({
    summary: "Simple templates to add login widgets to an app."
  });
  
  Package.on_use(function (api) {
    api.use('accounts-ui-unstyled', 'client');
    api.use('less', 'client');
  
    api.add_files(['login_buttons.less'], 'client');
  });
  
subject: use correct 'where' in package.js.