# GoogleChrome/proxy-polyfill

Proxy object polyfill

Repository: https://github.com/GoogleChrome/proxy-polyfill
Canonical: https://ross.abutalabs.com/products/proxy-polyfill
Language: JavaScript
License: Apache-2.0
License Family: permissive
Topics: proxy, polyfill, trap
Archived: true
Last push: 2024-06-27T15:22:42+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3848, "days_push": 797, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1140, forks 173 (observed 2026-08-28T04:03:44.303916+00:00)

## What it is
A polyfill for the ES6 Proxy object, supporting a limited subset of traps (get, set, apply, construct) for older browsers that lack native Proxy support. It is now in maintenance mode with no planned new features.

## Use cases
- support Proxy in legacy browsers like IE11
- add change notifications to object properties
- observe nested object trees for mutations
- polyfill ES6 Proxy get/set/apply/construct traps
- intercept property access in old browsers

## When to choose
- you must support legacy browsers without native Proxy
- you only need get, set, apply, or construct traps
- your proxied objects have properties known at creation time

## When to avoid
- you only target modern browsers, which support Proxy natively
- you need to proxy unrestricted dictionaries or add new properties dynamically
- you need full Proxy trap coverage or Proxy.revocable beyond supported traps

## Facets
- artifact type: library
- maturity: maintenance
- function: middleware, developer-tools
- domain: web-development, frontend, programming-languages
- platform: browser
- tags: proxy, polyfill, es6, javascript, traps, change-notification, nodejs

## Member repositories
- GoogleChrome/proxy-polyfill (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:44.303916+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 2026-08-30T06:35:26.103543+00:00, confidence not recorded.
  - readme: https://github.com/GoogleChrome/proxy-polyfill (fetched 2026-08-28T04:03:44.303916+00:00, sha e631880c1652)
  - registry_npm: https://registry.npmjs.org/proxy-polyfill (fetched 2026-08-29T12:40:48.488286+00:00, sha 964b0678f049)
- Data as of 2026-08-30T08:39:29.467469+00:00.