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Is eventemitter3 ESM-only? Can you require() it?

EventEmitter3 focuses on performance while maintaining a Node.js AND browser compatible interface.

Last verified Sep 9, 2026 against eventemitter3@5.0.4. Markdown · JSON

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

eventemitter3 publishes both a CommonJS entry and a native ESM entry (ESM added in 5.0.0). require("eventemitter3") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "eventemitter3" works alongside it.

What to do

  1. Nothing to change. require("eventemitter3") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import * as eventemitter3 from "eventemitter3" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
5.0.4 (Jan 19, 2026)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
5.0.4
Native ESM since
5.0.0
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
136.6M
License
MIT

Does eventemitter3@5.0.4 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("eventemitter3") from a CommonJS file and import "eventemitter3" from an ES module.

Runtimerequire("eventemitter3")import "eventemitter3"
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 eventemitter3

ES modules (import)

import * as eventemitter3 from "eventemitter3";

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

CommonJS (require)

const eventemitter3 = require("eventemitter3");

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 (38 versions; the newest 38 shown).

VersionsFormatFirst published
5.0.0 – 5.0.4Dual (CommonJS + ESM)Nov 28, 2022
0.0.0 – 4.0.7CommonJSSep 25, 2013

Frequently asked

Is eventemitter3 ESM-only?

eventemitter3@5.0.4 ships CommonJS and ESM builds. eventemitter3 publishes both a CommonJS entry and a native ESM entry (ESM added in 5.0.0). require("eventemitter3") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "eventemitter3" works alongside it.

Can I require eventemitter3?

Yes. eventemitter3 ships a CommonJS entry alongside the native ESM entry. require("eventemitter3") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.

Does eventemitter3 work in Bun?

Yes. import "eventemitter3" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does eventemitter3 ship TypeScript types?

Yes. eventemitter3 bundles its own type declarations; no @types package is needed.

Links

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