You Don't Need Moment.js is a reference guide and ESLint plugin that documents native and alternative library functions to replace Moment.js functionality.
The project addresses the performance overhead caused by Moment.js in web applications. Moment.js suffers from an object-oriented API design that prevents tree-shaking, resulting in large bundle sizes even when only a few date functions are needed. Additionally, its mutable API can introduce bugs. The project provides a comprehensive list of replacement functions and comparisons with alternatives like date-fns, dayjs, and Luxon, helping developers understand what they can use instead.
Developers should consider this guide if they are building performance-sensitive applications where bundle size matters. It suits projects that only need basic date manipulation and can afford to migrate away from Moment.js. The project explicitly compares Moment.js to date-fns, which supports tree-shaking and uses a functional rather than object-oriented pattern, and to dayjs, which offers a smaller core with similar APIs for easier migration. The guide demonstrates that removing Moment.js can yield significant bundle size reductions.
The project maintains an active collection of replacement patterns and comparisons across multiple date libraries. It includes an ESLint plugin to help developers identify and replace Moment.js usage in their codebases. The repository tracks developments in the date library ecosystem and updates its recommendations accordingly.
