# taylorhakes/promise-polyfill

Lightweight ES6 Promise polyfill for the browser and node. A+ Compliant

Repository: https://github.com/taylorhakes/promise-polyfill
Canonical: https://ross.abutalabs.com/products/promise-polyfill
Language: JavaScript
License: MIT
License Family: permissive
Last push: 2024-05-20T08:56:22+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4576, "days_push": 835, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2142, forks 310 (observed 2026-08-28T04:06:18.511106+00:00)

## What it is
A lightweight (<1kb gzipped) ES6 Promise polyfill for browsers and Node.js that is Promises/A+ compliant. It can be used as a global polyfill for older browsers like IE or as a non-invasive ponyfill for library authors.

## Use cases
- support promises in internet explorer and other old browsers
- add a global Promise object when the browser lacks native promises
- use a ponyfill without polluting the global environment in a library
- make legacy codebases use standard ES6 promise syntax
- shim Promise support in older node versions

## When to choose
- you must support IE8+ or other browsers without native Promise support
- you need a tiny, spec-compliant Promise implementation
- you are a library author who wants a Promise ponyfill that doesn't touch globals

## When to avoid
- your target browsers all support native promises
- you need modern features beyond the ES6 Promise spec
- you need high-performance async scheduling without a setImmediate polyfill in IE/Edge

## Facets
- artifact type: library
- maturity: maintenance
- function: serialization
- domain: web-development, frontend, developer-tools
- platform: browser, cross-platform
- tags: promise, polyfill, ponyfill, promises-aplus, es6, javascript, lightweight, nodejs

## Member repositories
- taylorhakes/promise-polyfill (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:18.511106+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:51:18.868516+00:00, confidence not recorded.
  - readme: https://github.com/taylorhakes/promise-polyfill (fetched 2026-08-28T04:06:18.511106+00:00, sha 7276f7816e86)
  - registry_npm: https://registry.npmjs.org/promise-polyfill (fetched 2026-08-29T10:31:36.700835+00:00, sha 74bac4cd3e25)
- Data as of 2026-08-30T08:39:29.467469+00:00.