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immerjs
immer
JavaScript2018–2025
immerjs / immer

immer

Create the next immutable state by mutating the current one

Explore on GitHubRead Hacker News discussions
22Distinct people
28Mentions
1Explicit recommenders
29KGitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

Create the next immutable state by mutating the current one

GitHub

Where it is used

No documented product use was verified in the last source check.

What people are saying

Hi, I'm a Redux maintainer. I personally would recommend _against_ using Immutable.js, for a number of reasons [0]. Instead, I highly recommend the Immer library [1], which…

acemarke used a recommendation phrase. One indexed comment matches. This is a phrase match, not a verdict.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

Mentioned in the same Hacker News threads. That is not proof they are substitutes.

This week on Hacker News

Nov 8–Nov 15 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/15/2026, 2:59:58 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year28 dated mentions

Observed mentions: 2018-01-01 19:34:07 UTC to 2025-12-25 16:13:03 UTC.

02468102018-01-01 00:00:00 UTC to 2019-01-01 00:00:00 UTC (exclusive): 9 mentions; 3 submissions, 6 comments20182019-01-01 00:00:00 UTC to 2020-01-01 00:00:00 UTC (exclusive): 9 mentions; 0 submissions, 9 comments2020-01-01 00:00:00 UTC to 2021-01-01 00:00:00 UTC (exclusive): 4 mentions; 0 submissions, 4 comments2021-01-01 00:00:00 UTC to 2022-01-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments20212022-01-01 00:00:00 UTC to 2023-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2023-01-01 00:00:00 UTC to 2024-01-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments2024-01-01 00:00:00 UTC to 2025-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2025-01-01 00:00:00 UTC to 2026-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2025

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20182018-01-01 00:00:00 UTC2019-01-01 00:00:00 UTC936
20192019-01-01 00:00:00 UTC2020-01-01 00:00:00 UTC909
20202020-01-01 00:00:00 UTC2021-01-01 00:00:00 UTC404
20212021-01-01 00:00:00 UTC2022-01-01 00:00:00 UTC202
20222022-01-01 00:00:00 UTC2023-01-01 00:00:00 UTC101
20232023-01-01 00:00:00 UTC2024-01-01 00:00:00 UTC202
20242024-01-01 00:00:00 UTC2025-01-01 00:00:00 UTC000
20252025-01-01 00:00:00 UTC2026-01-01 00:00:00 UTC101

What Hacker News says

1 sources
acemarke·Dec 25, 2025
I've never seen this kind of benchmark graph before, and it looks really neat! How was this generated? What tool was used for the benchmarks? (I actually spent most of Sep/Oct working on optimizing the Immer JS immutable update library, and used a benchmarking tool called `mitata`, so I was doing a lot of this same kind of work: https://github.com/immerjs/immer/pull/1183 . Would love to add some new tools to my repertoire here!)
In Python 3.15’s interpreter for Windows x86-64 should hopefully be 15% faster

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