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Is define-lazy-prop ESM-only? Can you require() it?

Define a lazily evaluated property on an object

Last verified Sep 9, 2026 against define-lazy-prop@3.0.0. JSON

ESM-only ESM-only since 3.0.0 — last CommonJS version is 2.0.0

define-lazy-prop dropped its CommonJS build in 3.0.0 (April 2021). The last version you can require() on every Node.js version, including 18 and older, is 2.0.0, published Apr 10, 2019.

On Node.js 20.19+, 22.12+ and every newer release, require("define-lazy-prop") 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
3.0.0 (Apr 14, 2021)
Module format
ESM-only
Last CommonJS version
2.0.0
ESM-only since
3.0.0 (Apr 14, 2021)
TypeScript types
@types/define-lazy-prop
Node engines
>=12
Weekly downloads
87.5M
License
MIT

Does define-lazy-prop@3.0.0 actually load? Runtime test results

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

Runtimerequire("define-lazy-prop")import "define-lazy-prop"
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 define-lazy-prop

ES modules (import)

import defineLazyProp from "define-lazy-prop";

CommonJS (require)

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

// Any Node.js version:
const defineLazyProp = await import("define-lazy-prop");

// Or pin the last CommonJS release:
// npm install define-lazy-prop@2.0.0

Module format by version

Derived from the type, main and exports fields of every stable release on npm (3 versions; the newest 3 shown).

VersionsFormatFirst published
3.0.0ESM-onlyApr 14, 2021
1.0.0 – 2.0.0CommonJSJan 15, 2017

Frequently asked

Is define-lazy-prop ESM-only?

define-lazy-prop@3.0.0 is ESM-only. define-lazy-prop dropped its CommonJS build in 3.0.0 (April 2021). The last version you can require() on every Node.js version, including 18 and older, is 2.0.0, published Apr 10, 2019.

Which version of define-lazy-prop still supports CommonJS / require()?

2.0.0 is the last version of define-lazy-prop with a CommonJS build. Install it with "npm install define-lazy-prop@2.0.0". Every version from 3.0.0 on is ESM-only.

How do I use define-lazy-prop from a CommonJS file?

Use a dynamic import: const mod = await import("define-lazy-prop"). On Node.js 20.19+, 22.12+ and newer, a plain require("define-lazy-prop") also works for ESM packages that do not use top-level await. Alternatively pin define-lazy-prop@2.0.0.

Does define-lazy-prop work in Bun?

Yes. import "define-lazy-prop" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does define-lazy-prop ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/define-lazy-prop".

Links

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