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Is event-stream ESM-only? Can you require() it?

construct pipes of streams of events

Last verified Sep 9, 2026 against event-stream@4.0.1. JSON

CommonJS CommonJS — require() works on every Node.js version

event-stream ships CommonJS only. require("event-stream") works everywhere. import "event-stream" 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.

Latest
4.0.1 (Sep 29, 2018)
Module format
CommonJS
Last CommonJS version
4.0.1
TypeScript types
@types/event-stream
Node engines
not declared
Weekly downloads
5.6M
License
MIT

Does event-stream@4.0.1 actually load? Runtime test results

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

Runtimerequire("event-stream")import "event-stream"
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 event-stream

ES modules (import)

import eventStream from "event-stream";

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 eventStream = require("event-stream");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (84 versions; the newest 60 shown).

VersionsFormatFirst published
1.1.0 – 4.0.1CommonJSMay 21, 2012

Frequently asked

Is event-stream ESM-only?

event-stream@4.0.1 is a CommonJS package. event-stream ships CommonJS only. require("event-stream") works everywhere. import "event-stream" 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 event-stream with ES module syntax?

Yes. import eventStream from "event-stream" 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 event-stream work in Bun?

Yes. import "event-stream" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does event-stream ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/event-stream".

Links

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