How to use the error-ex.append function in error-ex

'use strict';
const errorEx = require('error-ex');
const fallback = require('json-parse-better-errors');
const {default: LinesAndColumns} = require('lines-and-columns');
const {codeFrameColumns} = require('@babel/code-frame');

const JSONError = errorEx('JSONError', {
	fileName: errorEx.append('in %s'),
	codeFrame: errorEx.append('\n\n%s\n')
});

module.exports = (string, reviver, filename) => {
	if (typeof reviver === 'string') {
		filename = reviver;
		reviver = null;
	}

	try {
		try {
			return JSON.parse(string, reviver);
		} catch (error) {
			fallback(string, reviver);
			throw error;
		}

*
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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';
var errorEx = require('error-ex');
var fallback = require('./vendor/parse');

var JSONError = errorEx('JSONError', {
	fileName: errorEx.append('in %s')
});

module.exports = function (x, reviver, filename) {
	if (typeof reviver === 'string') {
		filename = reviver;
		reviver = null;
	}

	try {
		try {
			return JSON.parse(x, reviver);
		} catch (err) {
			fallback.parse(x, {
				mode: 'json',
				reviver: reviver
			});

'use strict';
const errorEx = require('error-ex');
const fallback = require('json-parse-better-errors');
const {default: LinesAndColumns} = require('lines-and-columns');
const {codeFrameColumns} = require('@babel/code-frame');

const JSONError = errorEx('JSONError', {
	fileName: errorEx.append('in %s'),
	codeFrame: errorEx.append('\n\n%s\n')
});

module.exports = (string, reviver, filename) => {
	if (typeof reviver === 'string') {
		filename = reviver;
		reviver = null;
	}

	try {
		try {
			return JSON.parse(string, reviver);
		} catch (error) {
			fallback(string, reviver);
			throw error;
		}
	} catch (error) {