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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. Markdown · JSON

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

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

What to do

  1. require("fast-deep-equal") 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 fastDeepEqual from "fast-deep-equal"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
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 1.4.0✓ 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, corrected where a runtime test of that version contradicted them (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 on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. 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 1.4.0 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.

Links

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