code: function isConstructorFunction(node) {
      return (
          node.type === "FunctionExpression" &&
          node.parent.type === "MethodDefinition" &&
          node.parent.kind === "constructor"
      );
  }
docs: ------------------------------------------------------------------------------ Helpers ------------------------------------------------------------------------------ 
  Checks whether or not a given node is a constructor.
  @param {ASTNode} node - A node to check. This node type is one of
  `Program`, `FunctionDeclaration`, `FunctionExpression`, and
  `ArrowFunctionExpression`.
  @returns {boolean} `true` if the node is a constructor.