canirequire › Dual (CommonJS + ESM) › immer
Is immer ESM-only? Can you require() it?
Create your next immutable state by mutating the current one
Last verified Sep 9, 2026 against immer@11.1.18. JSON
Dual (CommonJS + ESM) Dual package — both require() and import work
immer publishes both a CommonJS entry and a native ESM entry (ESM added in 9.0.13). require("immer") and import "immer" both work on every supported Node.js version and in Bun.
Does immer@11.1.18 actually load? Runtime test results
Installed and executed on Sep 9, 2026 with require("immer") from a CommonJS file and import "immer" from an ES module.
| Runtime | require("immer") | import "immer" |
|---|---|---|
| Node.js 18 | ✓ works | ✓ works |
| Node.js 20 | ✓ works | ✓ works |
| Node.js 22 | ✓ works | ✓ works |
| Node.js 24 | ✓ works | ✓ works |
| Node.js 26 | ✓ works | ✓ works |
| Bun 1.4 | ✓ works | ✓ works |
How to import immer
ES modules (import)
import immer from "immer";CommonJS (require)
const immer = require("immer");Module format by version
Derived from the type, main and exports fields of every stable release on npm (175 versions; the newest 60 shown).
| Versions | Format | First published |
|---|---|---|
| 9.0.13 – 11.1.18 | Dual (CommonJS + ESM) | May 11, 2022 |
| 7.0.13 – 9.0.12 | CommonJS | Oct 20, 2020 |
Frequently asked
Is immer ESM-only?
immer@11.1.18 ships CommonJS and ESM builds. immer publishes both a CommonJS entry and a native ESM entry (ESM added in 9.0.13). require("immer") and import "immer" both work on every supported Node.js version and in Bun.
Can I require immer?
Yes. immer ships a CommonJS entry, so require("immer") works on every Node.js version, alongside the native ESM entry for import.
Does immer work in Bun?
Yes. import "immer" loaded successfully in Bun 1.4 on Sep 9, 2026.
Does immer ship TypeScript types?
Yes. immer bundles its own type declarations; no @types package is needed.
Links
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