How to use the pluralize.addIrregularRule function in pluralize

// @flow

import pluralize from "pluralize";

(pluralize('word'): string);
pluralize('word', 0);
pluralize('word', 0, true);
pluralize.addIrregularRule('word', 'wordz');

// $ExpectError
pluralize();
// $ExpectError
pluralize.nope;

pluralize.addIrregularRule = (single: string, plural: string) => require('pluralize').addIrregularRule(single, plural)
pluralize.addUncountableRule = (word: string | RegExp) => require('pluralize').addUncountableRule(word)

_getSnackbarMessage(skipped, done) {
    pluralize.addIrregularRule('its', 'their');
    var skipText = skipped
      ? `${skipped} ${pluralize('devices', skipped)} ${pluralize('have', skipped)} more than one pending authset. Expand ${pluralize(
          'this',
          skipped
        )} ${pluralize('device', skipped)} to individually adjust ${pluralize('their', skipped)} authorization status. `
      : '';
    var doneText = done ? `${done} ${pluralize('device', done)} ${pluralize('was', done)} updated successfully. ` : '';
    this.props.setSnackbar(doneText + skipText);
  }

/*
 * periodic
 * http://github.com/typesettin/periodic
 *
 * Copyright (c) 2014 Yaw Joseph Etse. All rights reserved.
 */

'use strict';

var querystring = require('querystring'),
	numeral = require('numeral'),
	pluralize = require('pluralize'),
	json2html = require('node-json2html'),
	capitalize = require('capitalize'),
	moment = require('moment');
	pluralize.addIrregularRule('data','datas');
/**
 * A module that contains view helpers for ejs views.
 * @author Yaw Joseph Etse
 * @copyright Copyright (c) 2014 Typesettin. All rights reserved.
 * @license MIT
 * @module staticViewHelper
 */
module.exports = {
	/** ejs view helper
	 * @exports staticViewHelper/viewhelper
	 * @memberOf staticViewHelper
	 */
	viewhelper: {
		/** helper function that returns the html for a javascript tag
		 * @param {object} scripts either a string or an object/array of file paths
		 * @returns {string} script tag for javascript

render() {

    pluralize.addIrregularRule('corpus', 'corpora');

    let plural = pluralize(this.props.name, 2);

    return (
      <div>

        <h4>Filter by {this.props.name}</h4>

        </div>