How to use the @accordproject/cicero-tools.CodeGen.FileWriter function in @accordproject/cicero-tools

*
 * 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';

const Logger = require('@accordproject/concerto-core').Logger;
const Template = require('@accordproject/cicero-core').Template;
const Clause = require('@accordproject/cicero-core').Clause;
const Engine = require('@accordproject/cicero-engine').Engine;
const CodeGen = require('@accordproject/cicero-tools').CodeGen;
const FileWriter = CodeGen.FileWriter;
const fs = require('fs');
const path = require('path');
const mkdirp = require('mkdirp');
const GoLangVisitor = CodeGen.GoLangVisitor;
const JavaVisitor = CodeGen.JavaVisitor;
const CordaVisitor = CodeGen.CordaVisitor;
const JSONSchemaVisitor = CodeGen.JSONSchemaVisitor;
const PlantUMLVisitor = CodeGen.PlantUMLVisitor;
const TypescriptVisitor = CodeGen.TypescriptVisitor;

/**
 * Utility class that implements the commands exposed by the Cicero CLI.
 * @class
 * @memberof module:cicero-cli
 */
class Commands {