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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. Markdown · JSON

Dual (CommonJS + ESM) Dual package — require() works on every Node.js version we test; import works too

immer publishes both a CommonJS entry and a native ESM entry (ESM added in 9.0.13). require("immer") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "immer" works alongside it.

What to do

  1. Nothing to change. require("immer") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import * as immer from "immer" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
11.1.18 (Aug 19, 2026)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
11.1.18
Native ESM since
9.0.13
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
54.5M
License
MIT

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.

Runtimerequire("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 1.4.0✓ works✓ works

How to import immer

ES modules (import)

import * as immer from "immer";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

const immer = require("immer");

Module format by version

Derived from the type, main and exports fields of every stable release on npm, corrected where a runtime test of that version contradicted them (175 versions; the newest 60 shown).

VersionsFormatFirst published
9.0.13 – 11.1.18Dual (CommonJS + ESM)May 11, 2022
7.0.13 – 9.0.12CommonJSOct 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") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "immer" works alongside it.

Can I require immer?

Yes. immer ships a CommonJS entry alongside the native ESM entry. require("immer") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.

Does immer work in Bun?

Yes. import "immer" loaded successfully in Bun 1.4.0 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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