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Is fast-deep-equal ESM-only? Can you require() it?

Fast deep equal

Last verified Sep 9, 2026 against fast-deep-equal@3.1.3. JSON

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

fast-deep-equal ships CommonJS only. require("fast-deep-equal") works everywhere. import "fast-deep-equal" 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.

Latest
3.1.3 (Jun 8, 2020)
Module format
CommonJS
Last CommonJS version
3.1.3
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
180.3M
License
MIT

Does fast-deep-equal@3.1.3 actually load? Runtime test results

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

Runtimerequire("fast-deep-equal")import "fast-deep-equal"
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✓ works✓ works

How to import fast-deep-equal

ES modules (import)

import fastDeepEqual from "fast-deep-equal";

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 fastDeepEqual = require("fast-deep-equal");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (11 versions; the newest 11 shown).

VersionsFormatFirst published
0.0.1 – 3.1.3CommonJSJun 15, 2017

Frequently asked

Is fast-deep-equal ESM-only?

fast-deep-equal@3.1.3 is a CommonJS package. fast-deep-equal ships CommonJS only. require("fast-deep-equal") works everywhere. import "fast-deep-equal" 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 fast-deep-equal with ES module syntax?

Yes. import fastDeepEqual from "fast-deep-equal" 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 fast-deep-equal work in Bun?

Yes. import "fast-deep-equal" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does fast-deep-equal ship TypeScript types?

Yes. fast-deep-equal bundles its own type declarations; no @types package is needed.

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