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JavaScript utility libraries are less essential for everyday collection work than they once were, but they still can provide focused helpers, TypeScript support and migration paths that native methods do not. Bytes raised the question—“do we really still need utility libraries in the Year of our Spec, 2025?”—in its July 28, 2025, issue #412, “Of Mice and Toolkits.” Its featured example, es-toolkit, is a modern utility library with a Lodash compatibility entry point. Whether it belongs in a project depends on the APIs, runtimes, bundle and migration work that project actually needs.
What is es-toolkit?
es-toolkit is a JavaScript utility library offering focused functions such as debounce, delay, sum and pick. The project describes support for TypeScript, tree shaking and modern toolchains, as well as a compatibility layer for Lodash users. See the es-toolkit repository and official project site for its current API and setup guidance.
That is a different proposition from adding a dependency just to call familiar array methods. JavaScript already includes methods such as map and filter. A utility library is worth considering when its additional helpers, types, compatibility support or import behavior solve a concrete problem in the application.
How does it compare with Lodash?
Lodash describes itself as a JavaScript utility library emphasizing modularity, performance and additional helpers. es-toolkit targets similar utility-library needs while offering its own APIs and a Lodash compatibility path. The choice is not simply “old library versus new library”: it should turn on the functions a codebase uses and the cost of changing them.
#1 Best Overall
Bytes reported in July 2025 that es-toolkit was “2–3x faster and 97% smaller” than Lodash. The project also makes similar performance and size claims. These are attributed claims, not universal outcomes established for every app. Results can vary with the functions used, input data, runtime, imports and production bundler configuration. Measure the actual build and workload before treating either number as a project-level benefit.
What does the Lodash compatibility layer make easier?
The project documents a es-toolkit/compat entry point intended to ease migration from Lodash. It gives teams a route to evaluate es-toolkit without assuming that every existing import and behavior can be replaced unchanged. Compatibility is not a guarantee of a zero-change migration: identify the APIs in use, check the documented compatibility surface and run the application’s tests.
Rank #2
- Inventory usage: search the codebase for Lodash imports and list the functions and calling patterns actually used.
- Check compatibility: compare those functions with the current
es-toolkit/compatdocumentation, including expected behavior and edge cases. - Make a controlled change: migrate a limited area first, then run relevant unit, integration and type checks.
- Review the production result: inspect bundle output and benchmark representative operations in the target runtime if size or speed is a reason for switching.
This makes the compatibility layer a migration aid to assess, not a promise that an entire application will work without edits.
Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesHow to decide whether a project needs a utility library
Start with the project’s requirements rather than a headline comparison. Native methods may cover the need; a library can make sense when it provides useful functions, types or migration support that justify another dependency.
- API coverage: identify the helpers the project needs beyond built-in JavaScript methods.
- Bundle effect: compare the actual production bundle using the imports and tree-shaking configuration the project will ship. A project’s “up to 97% smaller” claim is not a guaranteed reduction for every build.
- Performance: benchmark representative data and operations in the app’s target runtime. Do not assume one advertised speed comparison applies to every function or workload.
- TypeScript and runtime support: verify type inference and compatibility with the project’s browser or server targets, consulting current documentation for Node.js, Deno, Bun or browsers as applicable.
- Migration cost: account for API differences, behavior checks, code changes and test coverage—not just the compatibility import.
Bytes’ July 2025 issue described es-toolkit as having 3 million weekly npm downloads and named Storybook, Ink and Recharts as users at that time. Those are historical claims from the newsletter, not a current adoption measure. They may indicate that the project had visible use, but they do not establish whether it is the right dependency for a particular codebase.
Quick Recap
Rank #4
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