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

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. Markdown · JSON

CommonJS CommonJS — require() works on every Node.js version we test

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.
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

Does jsbi@4.3.2 actually load? Runtime test results

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

Runtimerequire("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 (import)

import jsbi from "jsbi";

Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.

CommonJS (require)

const jsbi = require("jsbi");

Module format by version

Derived from the type, main and exports fields of every stable release on npm, corrected where a runtime test of that version contradicted them (29 versions; the newest 29 shown).

VersionsFormatFirst published
0.0.0 – 4.3.2CommonJSAug 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

Other commonjs packages

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