scripts/eslint_rules/lib/check-enumerated-histograms.ts

// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import {createRule} from './utils/ruleCreator.ts';

export default createRule({
  name: 'check-enumerated-histograms',
  meta: {
    type: 'problem',
    docs: {
      description: 'check arguments when recording enumerated histograms',
      category: 'Possible Errors',
    },
    fixable: 'code',
    messages: {
      invalidArgument:
          'When calling \'recordEnumeratedHistogram\' the third argument should be of the form \'SomeEnum.MAX_VALUE\'.',
    },
    schema: [],  // no options
  },
  defaultOptions: [],
  create: function(context) {
    return {
      CallExpression(node) {
        if (node.callee.type === 'MemberExpression' && node.callee.object.type === 'Identifier' &&
            node.callee.object.name === 'InspectorFrontendHostInstance' && node.callee.property.type === 'Identifier' &&
            node.callee.property.name === 'recordEnumeratedHistogram') {
          const argumentNode = node.arguments[2];

          if (argumentNode.type !== 'MemberExpression' || argumentNode.property.type !== 'Identifier' ||
              argumentNode.property.name !== 'MAX_VALUE') {
            context.report({
              node,
              messageId: 'invalidArgument',
            });
          }
        }
      },
    };
  },
});