eslint-plugin-mozilla/lib/rules/no-define-cc-etc.js

/**
 * @fileoverview Reject defining Cc/Ci/Cr/Cu.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

"use strict";

// -----------------------------------------------------------------------------
// Rule Definition
// -----------------------------------------------------------------------------

const componentsBlacklist = ["Cc", "Ci", "Cr", "Cu"];

module.exports = function(context) {

  // ---------------------------------------------------------------------------
  // Public
  //  --------------------------------------------------------------------------

  return {
    "VariableDeclarator": function(node) {
      if (node.id.type == "Identifier" && componentsBlacklist.includes(node.id.name)) {
        context.report(node,
          `${node.id.name} is now defined in global scope, a separate definition is no longer necessary.`);
      }

      if (node.id.type == "ObjectPattern") {
        for (let property of node.id.properties) {
          if (componentsBlacklist.includes(property.value.name)) {
            context.report(node,
              `${property.value.name} is now defined in global scope, a separate definition is no longer necessary.`);
          }
        }
      }
    }
  };
};