paulmillr/es6-shim
ECMAScript 6 compatibility shims for legacy JS engines observed · 2026-08-28
Health v2 · maintenance only
57/100
- Activity 77
- Release rhythm 8
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 5366
- days_rel: n/a
- days_push: 139
- n_releases_24m: 0
Adoption not part of the score
3098 stars · 373 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
A JavaScript library providing ECMAScript 6 (Harmony) compatibility shims for legacy JS engines, polyfilling features like Map, Set, Promise, and new String/RegExp methods. It lets code written against ES6 run in older browsers and Node.js environments.
Use cases
- run ES6 code in legacy browsers
- polyfill Promise Map and Set in old engines
- support String.prototype.startsWith and endsWith in IE
- make old Node.js versions behave like ES6
- add ES6 methods to legacy JavaScript runtime
When to choose
- you must support legacy browsers or JS engines lacking ES6 features
- you need spec-compliant polyfills for Map, Set, Promise, and string methods
When to avoid
- your target environments already support ES6 natively
- you only need one or two features - standalone per-method shims are lighter
- you want modern transpilation via Babel instead of runtime shims
Facets
library · maturity maintenance
developer-tools web-development developer-tools programming-languages browser cross-platform es6 shim polyfill ecmascript javascript compatibility nodejs
3 sources
- readme: https://github.com/paulmillr/es6-shim · fetched 2026-08-28 · c9a14499b736
- homepage: http://paulmillr.com · fetched 2026-08-29 · 65a1cbcce56d
- registry_npm: https://registry.npmjs.org/es6-shim · fetched 2026-08-29 · ef93a06a1238
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| paulmillr/es6-shim | main | 57 |
For agents
markdown · JSON · MCP: product_card(name="paulmillr/es6-shim")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem