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Is rxjs ESM-only? Can you require() it?
Reactive Extensions for modern JavaScript
Last verified Sep 9, 2026 against rxjs@7.8.2. JSON
CommonJS CommonJS — require() works on every Node.js version
rxjs ships CommonJS only. require("rxjs") works everywhere. import "rxjs" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.
It also declares a "module" field, so bundlers such as webpack, Vite and esbuild pick up an ESM build for tree-shaking.
Does rxjs@7.8.2 actually load? Runtime test results
Installed and executed on Sep 9, 2026 with require("rxjs") from a CommonJS file and import "rxjs" from an ES module.
| Runtime | require("rxjs") | import "rxjs" |
|---|---|---|
| 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 rxjs
ES modules (import)
import rxjs from "rxjs";Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.
CommonJS (require)
const rxjs = require("rxjs");Module format by version
Derived from the type, main and exports fields of every stable release on npm (70 versions; the newest 60 shown).
| Versions | Format | First published |
|---|---|---|
| 5.4.0 – 7.8.2 | CommonJS | May 9, 2017 |
Frequently asked
Is rxjs ESM-only?
rxjs@7.8.2 is a CommonJS package. rxjs ships CommonJS only. require("rxjs") works everywhere. import "rxjs" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.
Can I import rxjs with ES module syntax?
Yes. import rxjs from "rxjs" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.
Does rxjs work in Bun?
Yes. import "rxjs" loaded successfully in Bun 1.4 on Sep 9, 2026.
Does rxjs ship TypeScript types?
Yes. rxjs bundles its own type declarations; no @types package is needed.
Links
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