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

> jsbi@4.3.2 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

JSBI is a pure-JavaScript implementation of [the ECMAScript BigInt proposal](https://tc39.es/proposal-bigint/), which officially became a part of the JavaScript language in ES2020.

Last verified Sep 9, 2026 against jsbi@4.3.2.

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

It also declares a "module" field, so bundlers such as webpack, Vite and esbuild pick up an ESM build for tree-shaking.

## What to do

1. require("jsbi") 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 jsbi from "jsbi"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 4.3.2 (Mar 31, 2025)
- Module format: CommonJS
- Last CommonJS version: 4.3.2
- TypeScript types: bundled
- Node engines: not declared
- Weekly downloads: 3.9M
- License: Apache-2.0

## Runtime test results for jsbi@4.3.2

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

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

ES modules:

```js
import jsbi from "jsbi";
```

CommonJS:

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

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (29 versions; the newest 29 shown).

| Versions | Format | First published |
|---|---|---|
| 0.0.0 – 4.3.2 | CommonJS | Aug 31, 2018 |

## Frequently asked

**Is jsbi ESM-only?**

jsbi@4.3.2 is a CommonJS package. jsbi ships CommonJS only. require("jsbi") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "jsbi" 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 jsbi with ES module syntax?**

Yes. import jsbi from "jsbi" 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 jsbi work in Bun?**

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

**Does jsbi ship TypeScript types?**

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

## Links

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

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