canirequire › Dual (CommonJS + ESM) › eventemitter3
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. JSON
Dual (CommonJS + ESM) Dual package — both require() and import work
eventemitter3 publishes both a CommonJS entry and a native ESM entry (ESM added in 5.0.0). require("eventemitter3") and import "eventemitter3" both work on every supported Node.js version and in Bun.
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.
| Runtime | require("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 | ✓ works | ✓ works |
How to import eventemitter3
ES modules (import)
import eventemitter3 from "eventemitter3";CommonJS (require)
const eventemitter3 = require("eventemitter3");Module format by version
Derived from the type, main and exports fields of every stable release on npm (38 versions; the newest 38 shown).
| Versions | Format | First published |
|---|---|---|
| 5.0.0 – 5.0.4 | Dual (CommonJS + ESM) | Nov 28, 2022 |
| 0.0.0 – 4.0.7 | CommonJS | Sep 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") and import "eventemitter3" both work on every supported Node.js version and in Bun.
Can I require eventemitter3?
Yes. eventemitter3 ships a CommonJS entry, so require("eventemitter3") works on every Node.js version, alongside the native ESM entry for import.
Does eventemitter3 work in Bun?
Yes. import "eventemitter3" loaded successfully in Bun 1.4 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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