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

> long@5.3.2 ships CommonJS and ESM builds. Dual package — require() works on every Node.js version we test; import works too.

A Long class for representing a 64-bit two's-complement integer value.

Last verified Sep 9, 2026 against long@5.3.2.

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

## What to do

1. Nothing to change. require("long") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import * as long from "long" works alongside it; use named imports for what the ESM entry exports.
2. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 5.3.2 (Apr 17, 2025)
- Module format: Dual (CommonJS + ESM)
- Last CommonJS version: 5.3.2
- Native ESM since: 5.0.0
- TypeScript types: bundled
- Node engines: not declared
- Weekly downloads: 78.6M
- License: Apache-2.0

## Runtime test results for long@5.3.2

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

| Runtime | require("long") | import "long" |
|---|---|---|
| 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 long

ES modules:

```js
import * as long from "long";
```

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

CommonJS:

```js
const long = require("long");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (39 versions; the newest 39 shown).

| Versions | Format | First published |
|---|---|---|
| 5.1.0 – 5.3.2 | Dual (CommonJS + ESM) | Oct 30, 2021 |
| 5.0.0 – 5.0.1 | ESM-only | Oct 28, 2021 |
| 1.0.0 – 4.0.0 | CommonJS | Mar 12, 2013 |

## Frequently asked

**Is long ESM-only?**

long@5.3.2 ships CommonJS and ESM builds. long publishes both a CommonJS entry and a native ESM entry (ESM added in 5.0.0). require("long") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "long" works alongside it.

**Can I require long?**

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

**Does long work in Bun?**

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

**Does long ship TypeScript types?**

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

## Links

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

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