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is-immutable-type

Check the immutability of TypeScript types

v5.0.4, 11 Jun 2026BSD-3-ClauseESM + CommonJSTypes: BundledTypeScript tooling
$ npm install is-immutable-type
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Key numbers

As of 25 Sept 2026
Weekly downloads
979.4k
+134% over 12 months
Gzip bundle size
-
No Bundlephobia data
Dependencies
3
Direct, from package.json
Last release
3 months ago
v5.0.4
GitHub stars
14
4 forks
Open issues / PRs
4 / 4
Contributors
-
Commits, last 52 weeks
93

Downloads

Last week 2026-09-15 to 2026-09-21
0500k1m1.5m2mSept 2025Mar 2026Sept 2026High 1.6m (25 Aug 2026)Low 331.4k (23 Dec 2025)
Weekly npm downloads, one point per week, weeks starting 23 Sept 2025 to 15 Sept 2026. The y axis starts at zero.

979,409 downloads last week, 5,265,981 in the last month. The 12-month change of +134% compares the average of the last 4 weeks with the first 4 weeks of the series.

Maintenance

Releases, last 12 months
337 in total
Latest version
5.0.4, 11 Jun 20263 months ago
First published
14 Jul 2022
Last push to GitHub
25 Sept 2026same day as the snapshot
Repository archived
No
Open issues
4
Open pull requests
4
Commits, last 52 weeks
93
Dependents on npm
4

Major versions

  1. v5 first release 5.0.0, 3 Aug 2024
  2. v4 first release 4.0.0, 22 Apr 2024
  3. v3 first release 3.0.0, 15 Apr 2024
  4. v2 first release 2.0.0, 15 Jul 2023
  5. v1 first release 1.0.0, 24 Sept 2022
  6. v0 first release 0.0.1, 14 Jul 2022

Recent releases

VersionPublished
5.0.411 Jun 2026
5.0.33 Jun 2026
5.0.221 May 2026
5.0.11 Jan 2025
5.0.03 Aug 2024
4.0.022 Apr 2024
3.1.015 Apr 2024
3.0.015 Apr 2024
2.1.114 Apr 2024
2.1.014 Apr 2024
2.0.66 Apr 2024
2.0.54 Apr 2024
2.0.422 Mar 2024
2.0.322 Mar 2024

Compatibility

Module format
ESM + CommonJSFrom package.json type, main and exports fields
TypeScript types
Bundled
Node.js engine range
Not declared
Runtimes
-
Unpacked size (npm)
111 kB
Dependencies (3)
ts-api-utilsts-declaration-location@typescript-eslint/type-utils
Peer dependencies (2)
eslinttypescript

Install

npm install is-immutable-type

CDN

  • jsDelivrhttps://cdn.jsdelivr.net/npm/is-immutable-type@5.0.4/
  • unpkghttps://unpkg.com/is-immutable-type@5.0.4/
  • esm.shhttps://esm.sh/is-immutable-type@5.0.4
Sources: npm registry, npm downloads API, GitHub API. Data fetched 25 Sept 2026.

Indexability: Indexed.