core-js
Modular polyfill library for ES2015+ features in JavaScript.
Languages, types and runtimes npm MIT
Used in agent projects
35
0.3% of 12,697 public repos built with AI coding agents
Rank in languages, types and runtimes
#12 of 18
by use in those projects
Downloads
69.1M
npm, last 7 days, core-js
GitHub stars
25.5K
last push Oct 8, 2026
How core-js is used
core-js is a dependency in 35 of the 12,697 public GitHub projects set up for AI coding agents that we scanned (0.3%), #12 of 18 in languages, types and runtimes. The most used alternative there is TypeScript. Projects that use it most often also use Babel (JavaScript) (62.9%), Axios (45.7%), ESLint (77.1%).
Often used with core-js
| Babel (JavaScript) | 62.9% of core-js projects · 16.5× more than average |
|---|---|
| Axios | 45.7% of core-js projects · 4.6× more than average |
| ESLint | 77.1% of core-js projects · 2.0× more than average |
| Babel Loader | 37.1% of core-js projects · 32.8× more than average |
| Jest | 37.1% of core-js projects · 6.7× more than average |
| webpack | 34.3% of core-js projects · 17.1× more than average |
| css-loader | 28.6% of core-js projects · 42.2× more than average |
| webpack CLI | 28.6% of core-js projects · 18.0× more than average |
By coding agent
| Cursor | 0.4% of projects set up for it |
|---|---|
| Claude Code | 0.1% of projects set up for it |
Share of public repos configured for each agent that list core-js as a dependency.
Install
| Package | npm install core-js |
|---|---|
| Main stacks | TypeScript / JavaScript (32), Next.js (2), Python (1) |
| Example projects | handsontable/handsontable, 1600822305/AetherLink, ilmoi/nft-armory, near/wallet-selector, SanderElias/Samples |
Alternatives to core-js
| Tool | Used in agent projects | Downloads / wk | GitHub stars | License |
|---|---|---|---|---|
| TypeScript npm Language for application-scale JavaScript development with static type checking. |
7,092 (55.9%) | 305M | 111K | Apache-2.0 |
| tsx npm Node.js enhanced with esbuild to run TypeScript and ESM files. |
1,262 (9.9%) | 96.8M | 12.2K | MIT |
| ts-node npm TypeScript execution environment for Node.js with source map support. |
865 (6.8%) | 45.6M | 13.1K | MIT |
| vue-tsc npm TypeScript type checker for Vue.js single-file components. |
111 (0.9%) | 6.5M | 6,724 | MIT |
| tsconfig-paths npm Module resolution utility that loads Node.js modules according to TypeScript path mappings. |
86 (0.7%) | 113M | 1,908 | MIT |
| Cloudflare Workers Types npm TypeScript type definitions for Cloudflare Workers runtime. |
84 (0.7%) | 12.1M | 8,888 | MIT OR Apache-2.0 |
| jiti npm Runtime TypeScript and ESM support for Node.js without build steps. |
84 (0.7%) | 19M | 2,973 | MIT |
| CFFI pypi Foreign Function Interface for calling C code from Python. |
84 (0.7%) | 248M | 280 | — |