# Is @protobufjs/eventemitter ESM-only? Can you require() it?

> @protobufjs/eventemitter@1.1.1 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

A minimal event emitter.

Last verified Sep 9, 2026 against @protobufjs/eventemitter@1.1.1.

@protobufjs/eventemitter ships CommonJS only. require("@protobufjs/eventemitter") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "@protobufjs/eventemitter" 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.

## What to do

1. require("@protobufjs/eventemitter") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
2. From ES modules use the default import: import eventemitter from "@protobufjs/eventemitter"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 1.1.1 (May 22, 2026)
- Module format: CommonJS
- Last CommonJS version: 1.1.1
- TypeScript types: bundled
- Node engines: not declared
- Weekly downloads: 49.6M
- License: BSD-3-Clause

## Runtime test results for @protobufjs/eventemitter@1.1.1

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

| Runtime | require("@protobufjs/eventemitter") | import "@protobufjs/eventemitter" |
|---|---|---|
| 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 @protobufjs/eventemitter

ES modules:

```js
import eventemitter from "@protobufjs/eventemitter";
```

CommonJS:

```js
const eventemitter = require("@protobufjs/eventemitter");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (8 versions; the newest 8 shown).

| Versions | Format | First published |
|---|---|---|
| 1.0.0 – 1.1.1 | CommonJS | Dec 11, 2016 |

## Frequently asked

**Is @protobufjs/eventemitter ESM-only?**

@protobufjs/eventemitter@1.1.1 is a CommonJS package. @protobufjs/eventemitter ships CommonJS only. require("@protobufjs/eventemitter") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "@protobufjs/eventemitter" 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 @protobufjs/eventemitter with ES module syntax?**

Yes. import eventemitter from "@protobufjs/eventemitter" 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 @protobufjs/eventemitter work in Bun?**

Yes. import "@protobufjs/eventemitter" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does @protobufjs/eventemitter ship TypeScript types?**

Yes. @protobufjs/eventemitter bundles its own type declarations; no @types package is needed.

## Links

- [@protobufjs/eventemitter on npm](https://www.npmjs.com/package/@protobufjs/eventemitter)
- [Source repository](https://github.com/dcodeIO/protobuf.js)
- [HTML version](https://canirequire.com/package/@protobufjs/eventemitter/)
- [JSON version](https://canirequire.com/package/@protobufjs/eventemitter.json)

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