Please use the official package with @sheetbase/app-scripts.
Using pluralize in Google Apps Script.
Pluralize homepage: https://github.com/blakeembrey/pluralize
Library ID: 13U-fcaWqa6zFHJzfr7X1AZmRi02sjoKbi-YqesHlGQAhqJoowsFEetcd
Select latest version, set Indentifier to Pluralize
.
Logger.log(Pluralize.plural('test'));
Logger.log(Pluralize.singular('tests'));
Logger.log(Pluralize.pluralize('test'));
Logger.log(Pluralize.pluralize.plural('test'));
Logger.log(Pluralize.pluralize.singular('tests'));