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- 'use strict';
- const irregularPlurals = require('irregular-plurals');
- module.exports = (word, plural, count) => {
- if (typeof plural === 'number') {
- count = plural;
- }
- if (irregularPlurals.has(word.toLowerCase())) {
- plural = irregularPlurals.get(word.toLowerCase());
- const firstLetter = word.charAt(0);
- const isFirstLetterUpperCase = firstLetter === firstLetter.toUpperCase();
- if (isFirstLetterUpperCase) {
- plural = firstLetter.toUpperCase() + plural.slice(1);
- }
- const isWholeWordUpperCase = word === word.toUpperCase();
- if (isWholeWordUpperCase) {
- plural = plural.toUpperCase();
- }
- } else if (typeof plural !== 'string') {
- plural = (word.replace(/(?:s|x|z|ch|sh)$/i, '$&e').replace(/([^aeiou])y$/i, '$1ie') + 's')
- .replace(/i?e?s$/i, match => {
- const isTailLowerCase = word.slice(-1) === word.slice(-1).toLowerCase();
- return isTailLowerCase ? match.toLowerCase() : match.toUpperCase();
- });
- }
- return Math.abs(count) === 1 ? word : plural;
- };
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