repository·main·Indexed 27 days ago
https://github.com/toss/es-toolkitA high-performance, small-bundle-size JavaScript utility library with strong TypeScript support. Designed as a modern, tree-shakeable alternative to lodash, it includes a compatibility layer (es-toolkit/compat) for 1:1 lodash parity and provides specialized AI agent skills for tools like Claude Code.
es-toolkit is a modern JavaScript utility library designed for high performance and minimal footprint. It provides a collection of powerful functions for common programming tasks, optimized by leveraging the latest JavaScript features.
Key advantages over alternatives like lodash include:
es-toolkit is a high-performance JavaScript utility library designed for modern environments. It provides a wide range of utility functions (such as debounce, delay, chunk, sum, and pick) with a focus on:
isNotNil.es-toolkit/compat as a compatibility layer to easily replace lodash.lodash. Individual utility functions can be as small as less than 100 bytes, making it highly efficient for modern web applications.es-toolkit/fp package is optimized for high performance by utilizing modern JavaScript APIs and a streamlined implementation focused on essential features. In comparisons with other libraries like remeda, es-toolkit/fp has demonstrated an average performance improvement of 1.5x to 3x.lodash, es-toolkit can reduce bundle size by up to 97%. Some utility functions in es-toolkit are optimized to be smaller than 100 bytes, making it a highly efficient choice for performance-sensitive applications.lodash. Certain functions can achieve up to an 11× performance gain by leveraging modern JavaScript APIs. For detailed implementation details of how these benchmarks are conducted, refer to the benchmark code in the repository.es-toolkit/compat provides interfaces and behaviors that are 100% consistent with Lodash. It is designed to allow you to keep your existing Lodash code calls while gradually migrating to the core es-toolkit library.
Note: If your project does not already use Lodash, you should use es-toolkit instead of the compat layer.
es-toolkit/fp package is designed for minimal bundle size impact. It is significantly smaller than alternatives like remeda (ranging from 1.5x to over 10x smaller). Many utility functions are optimized to be under 100 bytes. The library fully supports tree shaking, allowing you to import only the specific functions you need to keep your production bundles lean.Depending on your preferred coding style, choose the appropriate entry point:
es-toolkit: Use for direct, standard function calls (e.g., map(array, fn)).es-toolkit/fp: Use for functional programming pipelines using pipe (e.g., pipe(array, map(fn))).es-toolkit/compat: Use when migrating from Lodash to maintain existing call sites.While es-toolkit/compat is designed for Lodash parity, it differs from the core es-toolkit package in several ways:
es-toolkit/compat matches Lodash 1:1, including implicit type coercions, multiple argument shapes, and deprecated helpers. es-toolkit only exposes type-safe, modern forms.es-toolkit/compat is slightly larger and slower than es-toolkit because it includes extra logic to ensure exact Lodash behavior parity.compat for parity but are not available in es-toolkit.es-toolkit/fp is designed with a modern implementation to ensure a minimal bundle size. It is significantly smaller than alternatives like remeda, offering up to 1.5x to 10x reduction in size. Many utility functions are optimized to be under 100 bytes. The library also fully supports tree shaking to ensure only the functions you use are included in your final bundle.es-toolkit/server is a utility module designed for server runtimes that provide Node.js-compatible APIs (such as Node.js, Deno, and Bun). It provides lightweight APIs for common server-side tasks like running processes and styling terminal output. It includes TypeScript types and maintains a small, predictable interface.
import { colors, exec } from 'es-toolkit/server';
const result = await exec('git', ['status', '--short'], {
throwOnNonZeroExitCode: false,
});
if (result.stdout.trim().length === 0) {
console.log(colors.green('Working tree is clean.'));
} else {
console.log(colors.yellow(result.stdout.trim()));
}