# Is node-int64 ESM-only? Can you require() it?

> node-int64@0.4.0 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Support for representing 64-bit integers in JavaScript

Last verified Sep 9, 2026 against node-int64@0.4.0.

node-int64 ships CommonJS only. require("node-int64") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "node-int64" 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("node-int64") 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 nodeInt64 from "node-int64"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: npm install -D @types/node-int64

## Facts

- Latest: 0.4.0 (Apr 4, 2015)
- Module format: CommonJS
- Last CommonJS version: 0.4.0
- TypeScript types: @types/node-int64
- Node engines: not declared
- Weekly downloads: 28.8M
- License: MIT

## Runtime test results for node-int64@0.4.0

Installed and executed on Sep 9, 2026 with require("node-int64") from a CommonJS file and import "node-int64" from an ES module.

| Runtime | require("node-int64") | import "node-int64" |
|---|---|---|
| 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 node-int64

ES modules:

```js
import nodeInt64 from "node-int64";
```

CommonJS:

```js
const nodeInt64 = require("node-int64");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (7 versions; the newest 7 shown).

| Versions | Format | First published |
|---|---|---|
| 0.1.0 – 0.4.0 | CommonJS | Dec 30, 2010 |

## Frequently asked

**Is node-int64 ESM-only?**

node-int64@0.4.0 is a CommonJS package. node-int64 ships CommonJS only. require("node-int64") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "node-int64" 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 node-int64 with ES module syntax?**

Yes. import nodeInt64 from "node-int64" 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 node-int64 work in Bun?**

Yes. import "node-int64" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does node-int64 ship TypeScript types?**

Not bundled. Install the community types with "npm install -D @types/node-int64".

## Links

- [node-int64 on npm](https://www.npmjs.com/package/node-int64)
- [Source repository](https://github.com/broofa/node-int64)
- [HTML version](https://canirequire.com/package/node-int64/)
- [JSON version](https://canirequire.com/package/node-int64.json)

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