immerjs/immer

Maintenance

Active

Human commits, 30 days

5

Human commits, 90 days

19

Human commits, 365 days

70

Bot share of commits, 365 days

43%

Last commit

Oct 2, 2026 (12 days ago)

Last human commit

Oct 2, 2026 (12 days ago)

Authors, 90 days

11

Last release

Oct 2, 2026 (12 days ago)

Median PR merge time

21 days

Responsiveness: of 5 recent issues, 80% got a maintainer reply. Median first response: 8 days.

Sources: Commits, Releases, Merged pull requests, Issues

People

Owner

Organization

Commits sampled

70 since Oct 14, 2025

Authors for half of commits

2

Authors for 80% of commits

8

Contributors

209

Top committers

• markerikson: 33% of commits
• mweststrate: 20% of commits
• unional: 9% of commits
• oriondean: 6% of commits
• giaBaoJS: 4% of commits

Sources: Commits, Contributors

Stars

Organic, confidence high

Bursts

• Feb 4, 2018 to Feb 6, 2018: about 428 more stars than usual, peak 279 in one day, a spike that tapers off. We couldn't check for an outside explanation.
• Mar 4, 2018 to Mar 6, 2018: about 175 more stars than usual, peak 91 in one day, a spike that tapers off. Outside explanation: a jump in forks, a jump in issues and pull requests.
• Mar 19, 2018 to Mar 20, 2018: about 85 more stars than usual, peak 86 in one day, a spike that tapers off. Outside explanation: a jump in forks, a jump in issues and pull requests.
• Jul 10, 2018 to Jul 11, 2018: about 103 more stars than usual, peak 63 in one day, a spike that tapers off. We couldn't check for an outside explanation.
• Aug 23, 2018 to Aug 27, 2018: about 204 more stars than usual, peak 92 in one day, a spike that tapers off. Outside explanation: a jump in forks, a jump in issues and pull requests.
• Sep 13, 2018 to Sep 20, 2018: about 533 more stars than usual, peak 195 in one day, a spike that tapers off. Outside explanation: a jump in forks, a jump in issues and pull requests.
• Apr 22, 2019 to Apr 24, 2019: about 95 more stars than usual, peak 55 in one day, a spike that tapers off. Outside explanation: a jump in forks, a jump in issues and pull requests.
• Oct 15, 2019 to Oct 17, 2019: about 99 more stars than usual, peak 83 in one day, a spike that tapers off. Outside explanation: a jump in forks.

Anyone can buy stars for any repo; bursts alone don't prove the owner did.

• The star history looks organic.

Sources: How star history is analyzed

Risk

Flags

No risk flags.

License

Now

MIT (OSI-approved)

A year ago

MIT (OSI-approved)

Packages

• immer (NPM): latest 11.1.21, published Oct 2, 2026
  Advisories for the latest version: none listed

Package and advisory data: deps.dev and OSV.

OpenSSF Scorecard: 6.1 out of 10 (via deps.dev).

Sources: GitHub: immerjs/immer, deps.dev: npm immer