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

Inspect utility for Node.js and browsers

Last verified Sep 9, 2026 against loupe@3.2.1. JSON

ESM-only ESM-only since 3.0.0 — last CommonJS version is 2.3.7

loupe dropped its CommonJS build in 3.0.0 (October 2023). The last version you can require() on every Node.js version, including 18 and older, is 2.3.7, published Oct 13, 2023.

On Node.js 20.19+, 22.12+ and every newer release, require("loupe") works anyway: Node can load synchronous ES modules through require(). Verified on Node 20, 22, 24, 26. Node.js 18 and older still fail with ERR_REQUIRE_ESM.

Latest
3.2.1 (Aug 21, 2025)
Module format
ESM-only
Last CommonJS version
2.3.7
ESM-only since
3.0.0 (Oct 20, 2023)
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
49.5M
License
MIT

Does loupe@3.2.1 actually load? Runtime test results

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

Runtimerequire("loupe")import "loupe"
Node.js 18✗ failsERR_REQUIRE_ESM✓ 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 loupe

ES modules (import)

import loupe from "loupe";

CommonJS (require)

// Node.js 20.19+ / 22.12+ / newer (package has no top-level await):
const loupe = require("loupe");

// Any Node.js version:
const loupe = await import("loupe");

// Or pin the last CommonJS release:
// npm install loupe@2.3.7

Module format by version

Derived from the type, main and exports fields of every stable release on npm (34 versions; the newest 34 shown).

VersionsFormatFirst published
3.0.0 – 3.2.1ESM-onlyOct 20, 2023
0.0.1 – 2.3.7CommonJSDec 17, 2013

Frequently asked

Is loupe ESM-only?

loupe@3.2.1 is ESM-only. loupe dropped its CommonJS build in 3.0.0 (October 2023). The last version you can require() on every Node.js version, including 18 and older, is 2.3.7, published Oct 13, 2023.

Which version of loupe still supports CommonJS / require()?

2.3.7 is the last version of loupe with a CommonJS build. Install it with "npm install loupe@2.3.7". Every version from 3.0.0 on is ESM-only.

How do I use loupe from a CommonJS file?

Use a dynamic import: const mod = await import("loupe"). On Node.js 20.19+, 22.12+ and newer, a plain require("loupe") also works for ESM packages that do not use top-level await. Alternatively pin loupe@2.3.7.

Does loupe work in Bun?

Yes. import "loupe" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does loupe ship TypeScript types?

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

Links

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