How to use the esprima-fb.Syntax.ClassDeclaration function in esprima-fb

// export var name = value
        case Syntax.VariableDeclaration:
          utils.move(node.declaration.range[0], state);
          node.declaration.declarations.forEach(function(declaration) {
            utils.catchup(declaration.id.range[1], state);
            utils.append(' = module.exports.' + declaration.id.name, state);
            traverse(declaration.init, path, state);
          });
          break;
        case Syntax.FunctionDeclaration:
          name = node.declaration.id.name;
          utils.move(node.declaration.range[0], state);
          traverse(node.declaration, path, state);
          utils.append(' module.exports.' + name + ' = ' + name + ';', state);
          break;
        case Syntax.ClassDeclaration:
          name = node.declaration.id.name;
          utils.move(node.declaration.range[0], state);
          traverse(node.declaration, path, state);
          utils.append('module.exports.' + name + ' = ' + name + ';', state);
          break;
        default:
          assert(false, "unknown declaration: " + node.declaration.type);
      }
    }

  } else if (node.source) {

    var modID;

    // export * from "module"
    if (node.specifiers.length === 1 &&

visitClassDeclaration.test = function(object, path, state) {
  return object.type === Syntax.ClassDeclaration;
};

visitClassDeclaration.test = function(node, path, state) {
  return node.type === Syntax.ClassDeclaration;
};

visitClassDeclaration.test = function(node, path, state) {
  return node.type === Syntax.ClassDeclaration;
};

visitClassDeclaration.test = function(node, path, state) {
  return node.type === Syntax.ClassDeclaration;
};

visitClassDeclaration.test = function(node, path, state) {
  return node.type === Syntax.ClassDeclaration;
};

visitClassDeclaration.test = function(node, path, state) {
  return node.type === Syntax.ClassDeclaration;
};