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es-toolkit: How a small internal library became a global library

·2026.06.22 17:09

Key point

Introduces the achievements and development principles behind es-toolkit and other open-source projects developed by Toss.

Details

Toss operates and distributes various open-source libraries to improve developer experience (DX) and productivity. A flagship project is es-toolkit, a TypeScript-based utility collection, which currently has 10.9K GitHub stars and is drawing global attention.

In addition, Toss offers the following useful libraries.

  • es-hangul: A utility for parsing and assembling Hangul
  • suspensive: Production-ready building blocks for React Suspense
  • overlay-kit: Declarative overlay primitives for modals, popovers, and more
  • use-funnel: A type-safe UI flow management tool for handling multi-step screens

These projects are developed based on the core principles of improving DX (Developer Experience), increasing productivity, and enhancing user experience (UX).

open-sourcereacttypescriptdeveloper-experiencees-toolkit
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