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Is mobx ESM-only? Can you require() it?

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Last verified Sep 9, 2026 against mobx@7.0.3. Markdown · JSON

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

mobx publishes both a CommonJS entry and a native ESM entry (ESM added in 7.0.0). require("mobx") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "mobx" works alongside it.

What to do

  1. Nothing to change. require("mobx") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import * as mobx from "mobx" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
7.0.3 (Aug 19, 2026)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
7.0.3
Native ESM since
7.0.0
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
3.3M
License
MIT

Does mobx@7.0.3 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("mobx") from a CommonJS file and import "mobx" from an ES module.

Runtimerequire("mobx")import "mobx"
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 mobx

ES modules (import)

import * as mobx from "mobx";

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

CommonJS (require)

const mobx = require("mobx");

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 (212 versions; the newest 60 shown).

VersionsFormatFirst published
7.0.0 – 7.0.3Dual (CommonJS + ESM)Jul 30, 2026
6.1.3 – 6.16.1CommonJSJan 29, 2021

Frequently asked

Is mobx ESM-only?

mobx@7.0.3 ships CommonJS and ESM builds. mobx publishes both a CommonJS entry and a native ESM entry (ESM added in 7.0.0). require("mobx") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "mobx" works alongside it.

Can I require mobx?

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

Does mobx work in Bun?

Yes. import "mobx" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does mobx ship TypeScript types?

Yes. mobx bundles its own type declarations; no @types package is needed.

Links

Other dual (commonjs + esm) packages

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