# tc39/proposal-object-rest-spread

Rest/Spread Properties for ECMAScript

Repository: https://github.com/tc39/proposal-object-rest-spread
Canonical: https://ross.abutalabs.com/products/proposal-object-rest-spread
Language: HTML
License Family: other
Archived: true
Last push: 2022-01-24T19:18:52+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 4417, "days_push": 1682, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, archived, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1487, forks 84 (observed 2026-08-28T04:04:52.087003+00:00)

## What it is
The TC39 proposal repository for Object Rest/Spread Properties in ECMAScript, which added rest properties for object destructuring and spread properties for object literals to the JavaScript language. It reached Stage 4 and was merged into the ECMAScript specification (ES2018).

## Use cases
- understand how object spread and rest syntax works in javascript
- read the spec text for object rest destructuring
- learn why spread only copies own enumerable properties
- find transpiler support for object rest spread
- research tc39 proposal process and stage 4 status

## When to choose
- you need the authoritative specification text for object rest/spread semantics
- you are researching how the feature was designed or its known edge cases
- you want to link to the official proposal for a language feature

## When to avoid
- you need a runtime library or tool - the feature is now built into JavaScript
- you need a transpiler plugin - use Babel or TypeScript directly
- you want general JavaScript documentation - MDN is more user-friendly

## Facets
- artifact type: learning-resource
- maturity: maintenance
- function: programming-language, documentation
- domain: programming-languages
- platform: browser, cross-platform
- tags: ecmascript, tc39, language-proposal, object-rest, object-spread, specification, stage-4, javascript, specifications, nodejs

## Member repositories
- tc39/proposal-object-rest-spread (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:52.087003+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 2026-08-30T04:33:49.372677+00:00, confidence not recorded.
  - readme: https://github.com/tc39/proposal-object-rest-spread (fetched 2026-08-28T04:04:52.087003+00:00, sha ebee018c2a1d)
- Data as of 2026-08-30T08:39:29.467469+00:00.