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Is ieee754 ESM-only? Can you require() it?

Read/write IEEE754 floating point numbers from/to a Buffer or array-like object

Last verified Sep 9, 2026 against ieee754@1.2.1. Markdown · JSON

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

ieee754 ships CommonJS only. require("ieee754") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "ieee754" 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("ieee754") 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 ieee754 from "ieee754"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
1.2.1 (Oct 27, 2020)
Module format
CommonJS
Last CommonJS version
1.2.1
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
100.8M
License
BSD-3-Clause

Does ieee754@1.2.1 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("ieee754") from a CommonJS file and import "ieee754" from an ES module.

Runtimerequire("ieee754")import "ieee754"
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 ieee754

ES modules (import)

import ieee754 from "ieee754";

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 ieee754 = require("ieee754");

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 (17 versions; the newest 17 shown).

VersionsFormatFirst published
1.0.0 – 1.2.1CommonJSDec 28, 2013

Frequently asked

Is ieee754 ESM-only?

ieee754@1.2.1 is a CommonJS package. ieee754 ships CommonJS only. require("ieee754") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "ieee754" 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 ieee754 with ES module syntax?

Yes. import ieee754 from "ieee754" 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 ieee754 work in Bun?

Yes. import "ieee754" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does ieee754 ship TypeScript types?

Yes. ieee754 bundles its own type declarations; no @types package is needed.

Links

Other commonjs packages

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