text: /**
   * Copyright 2018 The AMP HTML Authors. All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS-IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  'use strict';
  
  module.exports = function(context) {
    return {
      CallExpression(node) {
        if (/test-/.test(context.getFilename())) {
          return;
        }
  
        const {callee} = node;
        if (callee.type !== 'MemberExpression') {
          return;
        }
  
        const {property} = callee;
        if (property.type !== 'Identifier' || property.name !== 'vsyncFor') {
          return;
        }
  
        context.report(node, [
          'VSync is now a privileged service.',
          'You likely want to use the `BaseElement` methods' +
              ' `measureElement`, `mutateElement`, or `runElement`.',
          'In the worst case use the same methods on `Resources`.',
        ].join('\n\t'));
      },
    };
  };
  