{"adoption": {"forks": 880, "observed_at": "2026-08-28T04:11:52.979447+00:00", "stars": 28980}, "canonical_url": "https://ross.abutalabs.com/products/immer", "card": {"archived": false, "artifact_type": "library", "description": "Create the next immutable state by mutating the current one", "domain": ["frontend", "web-development", "developer-tools"], "enriched": true, "function": ["state-management", "serialization"], "health_score": 99, "homepage": "https://immerjs.github.io/immer/", "language": "JavaScript", "license": "MIT", "license_family": "permissive", "maturity": "stable", "member_repos": ["immerjs/immer"], "name": "immerjs/immer", "platform": ["browser"], "pushed_at": "2026-08-19T07:57:23+00:00", "repo": "immerjs/immer", "stars": 28980, "tags": ["immutable-state", "redux", "react", "copy-on-write", "javascript", "nodejs"], "topics": ["immutable", "immutables", "reducer", "redux", "state-tree"], "urls": [], "use_cases": ["simplify immutable updates in redux reducers", "manage react state without spread boilerplate", "create next immutable state by mutating current one", "detect accidental mutations of state objects", "perform deep updates on nested state trees", "share unchanged parts of state trees in memory"], "what_it_is": "Immer is a tiny JavaScript library that lets you work with immutable state by writing code that mutates a draft copy, producing the next immutable state tree. It is widely used with React state, Redux reducers, and configuration management.", "when_to_avoid": ["your state is small and simple enough that spread operators suffice", "you work outside the JavaScript ecosystem", "you need truly persistent data structures rather than copy-on-write snapshots"], "when_to_choose": ["you use React or Redux and want ergonomic immutable updates", "you need efficient structural sharing and change detection", "you want automatic detection of accidental mutations"]}, "data_as_of": "2026-08-30T08:39:29.467469+00:00", "members": [{"path": "/products/immer", "repo": "immerjs/immer", "role": "main", "score": 98}], "provenance": {"archived": {"kind": "observed", "observed_at": "2026-08-28T04:11:52.979447+00:00", "source": "github"}, "artifact_type": {"confidence": null, "enriched_at": "2026-08-29T16:53:16.334052+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aa4c25aa3b251470ec5512d4271c202d229a0a9ffcf377762be331a5157edfba", "fetched_at": "2026-08-28T04:11:52.979447+00:00", "kind": "readme", "missing": false, "url": "https://github.com/immerjs/immer"}, {"content_hash": "74618fef2263e6524da1a6f65b49777d134d64e348e47a2f7d86bdf04589840d", "fetched_at": "2026-08-29T07:50:40.560253+00:00", "kind": "homepage", "missing": false, "url": "https://immerjs.github.io/immer/"}], "taxonomy_version": 1}, "description": {"kind": "observed", "observed_at": "2026-08-28T04:11:52.979447+00:00", "source": "github"}, "domain": {"confidence": null, "enriched_at": "2026-08-29T16:53:16.334052+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aa4c25aa3b251470ec5512d4271c202d229a0a9ffcf377762be331a5157edfba", "fetched_at": "2026-08-28T04:11:52.979447+00:00", "kind": "readme", "missing": false, "url": "https://github.com/immerjs/immer"}, {"content_hash": "74618fef2263e6524da1a6f65b49777d134d64e348e47a2f7d86bdf04589840d", "fetched_at": "2026-08-29T07:50:40.560253+00:00", "kind": "homepage", "missing": false, "url": "https://immerjs.github.io/immer/"}], "taxonomy_version": 1}, "enriched": {"inputs": [], "kind": "computed", "method": "enrichment_status"}, "function": {"confidence": null, "enriched_at": "2026-08-29T16:53:16.334052+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aa4c25aa3b251470ec5512d4271c202d229a0a9ffcf377762be331a5157edfba", "fetched_at": "2026-08-28T04:11:52.979447+00:00", "kind": "readme", "missing": false, "url": "https://github.com/immerjs/immer"}, {"content_hash": "74618fef2263e6524da1a6f65b49777d134d64e348e47a2f7d86bdf04589840d", "fetched_at": "2026-08-29T07:50:40.560253+00:00", "kind": "homepage", "missing": false, "url": "https://immerjs.github.io/immer/"}], "taxonomy_version": 1}, "health_score": {"inputs": ["days_since_push", "days_since_release", "archived"], "kind": "computed", "method": "health_v1"}, "homepage": {"kind": "observed", "observed_at": "2026-08-28T04:11:52.979447+00:00", "source": "github"}, "language": {"kind": "observed", "observed_at": "2026-08-28T04:11:52.979447+00:00", "source": "github"}, "license": {"kind": "observed", "observed_at": "2026-08-28T04:11:52.979447+00:00", "source": "github"}, "license_family": {"inputs": ["license"], "kind": "computed", "method": "license_family"}, "maturity": {"confidence": null, "enriched_at": "2026-08-29T16:53:16.334052+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aa4c25aa3b251470ec5512d4271c202d229a0a9ffcf377762be331a5157edfba", "fetched_at": "2026-08-28T04:11:52.979447+00:00", "kind": "readme", "missing": false, "url": "https://github.com/immerjs/immer"}, {"content_hash": "74618fef2263e6524da1a6f65b49777d134d64e348e47a2f7d86bdf04589840d", "fetched_at": "2026-08-29T07:50:40.560253+00:00", "kind": "homepage", "missing": false, "url": "https://immerjs.github.io/immer/"}], "taxonomy_version": 1}, "member_repos": {"kind": "observed", "observed_at": "2026-08-28T04:11:52.979447+00:00", "source": "github"}, "name": {"kind": "observed", "observed_at": "2026-08-28T04:11:52.979447+00:00", "source": "github"}, "platform": {"confidence": null, "enriched_at": "2026-08-29T16:53:16.334052+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aa4c25aa3b251470ec5512d4271c202d229a0a9ffcf377762be331a5157edfba", "fetched_at": "2026-08-28T04:11:52.979447+00:00", "kind": "readme", "missing": false, "url": "https://github.com/immerjs/immer"}, {"content_hash": "74618fef2263e6524da1a6f65b49777d134d64e348e47a2f7d86bdf04589840d", "fetched_at": "2026-08-29T07:50:40.560253+00:00", "kind": "homepage", "missing": false, "url": "https://immerjs.github.io/immer/"}], "taxonomy_version": 1}, "pushed_at": {"kind": "observed", "observed_at": "2026-08-28T04:11:52.979447+00:00", "source": "github"}, "repo": {"kind": "observed", "observed_at": "2026-08-28T04:11:52.979447+00:00", "source": "github"}, "stars": {"kind": "observed", "observed_at": "2026-08-28T04:11:52.979447+00:00", "source": "github"}, "tags": {"confidence": null, "enriched_at": "2026-08-29T16:53:16.334052+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aa4c25aa3b251470ec5512d4271c202d229a0a9ffcf377762be331a5157edfba", "fetched_at": "2026-08-28T04:11:52.979447+00:00", "kind": "readme", "missing": false, "url": "https://github.com/immerjs/immer"}, {"content_hash": "74618fef2263e6524da1a6f65b49777d134d64e348e47a2f7d86bdf04589840d", "fetched_at": "2026-08-29T07:50:40.560253+00:00", "kind": "homepage", "missing": false, "url": "https://immerjs.github.io/immer/"}], "taxonomy_version": 1}, "topics": {"kind": "observed", "observed_at": "2026-08-28T04:11:52.979447+00:00", "source": "github"}, "urls": {"kind": "observed", "observed_at": "2026-08-28T04:11:52.979447+00:00", "source": "github"}, "use_cases": {"confidence": null, "enriched_at": "2026-08-29T16:53:16.334052+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aa4c25aa3b251470ec5512d4271c202d229a0a9ffcf377762be331a5157edfba", "fetched_at": "2026-08-28T04:11:52.979447+00:00", "kind": "readme", "missing": false, "url": "https://github.com/immerjs/immer"}, {"content_hash": "74618fef2263e6524da1a6f65b49777d134d64e348e47a2f7d86bdf04589840d", "fetched_at": "2026-08-29T07:50:40.560253+00:00", "kind": "homepage", "missing": false, "url": "https://immerjs.github.io/immer/"}], "taxonomy_version": 1}, "what_it_is": {"confidence": null, "enriched_at": "2026-08-29T16:53:16.334052+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aa4c25aa3b251470ec5512d4271c202d229a0a9ffcf377762be331a5157edfba", "fetched_at": "2026-08-28T04:11:52.979447+00:00", "kind": "readme", "missing": false, "url": "https://github.com/immerjs/immer"}, {"content_hash": "74618fef2263e6524da1a6f65b49777d134d64e348e47a2f7d86bdf04589840d", "fetched_at": "2026-08-29T07:50:40.560253+00:00", "kind": "homepage", "missing": false, "url": "https://immerjs.github.io/immer/"}], "taxonomy_version": 1}, "when_to_avoid": {"confidence": null, "enriched_at": "2026-08-29T16:53:16.334052+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aa4c25aa3b251470ec5512d4271c202d229a0a9ffcf377762be331a5157edfba", "fetched_at": "2026-08-28T04:11:52.979447+00:00", "kind": "readme", "missing": false, "url": "https://github.com/immerjs/immer"}, {"content_hash": "74618fef2263e6524da1a6f65b49777d134d64e348e47a2f7d86bdf04589840d", "fetched_at": "2026-08-29T07:50:40.560253+00:00", "kind": "homepage", "missing": false, "url": "https://immerjs.github.io/immer/"}], "taxonomy_version": 1}, "when_to_choose": {"confidence": null, "enriched_at": "2026-08-29T16:53:16.334052+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "aa4c25aa3b251470ec5512d4271c202d229a0a9ffcf377762be331a5157edfba", "fetched_at": "2026-08-28T04:11:52.979447+00:00", "kind": "readme", "missing": false, "url": "https://github.com/immerjs/immer"}, {"content_hash": "74618fef2263e6524da1a6f65b49777d134d64e348e47a2f7d86bdf04589840d", "fetched_at": "2026-08-29T07:50:40.560253+00:00", "kind": "homepage", "missing": false, "url": "https://immerjs.github.io/immer/"}], "taxonomy_version": 1}}, "score": {"components": {"activity": 98, "longevity": 100, "rhythm": 98}, "computed_at": "2026-09-02T17:46:02.011165+00:00", "flags": [], "formula": "round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)", "inputs": {"age_days": 3169, "days_push": 14, "days_rel": 14, "gap_med": 3.5, "n_releases_24m": 23}, "score": 98, "version": 2}, "staleness": {"enrichment_outdated": false, "low_confidence": false, "scrape_days": 9, "stale_scrape": false}}