@puq/names/dist/lib/names/pluralize.js

The library provides a useful function to create all casing variants of a given string value such as title-case, pascal-case, snake-case and so more.

/**
 * Pluralize string value by adding s,ies, es suffix.
 * @param name
 * @returns
 */ export function pluralize(name) {
    if (/[^aeiou]y$/i.test(name)) {
        name = name.slice(0, -1) + 'ies';
    } else if (/(s|x|z|ch|sh)$/i.test(name)) {
        name = name + 'es';
    } else if (/(hero|potato|tomato|echo)$/i.test(name)) {
        name = name + 'es';
    // Replace the 'f' or 'fe' with 'v' and add 'es'.
    } else if (/(fe?)$/i.test(name)) {
        name = name.replace(/fe?$/i, 'ves');
    } else {
        name = name + 's';
    }
    return name;
}

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