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

Parse String to Number based on configuration

Last verified Sep 9, 2026 against strnum@2.4.2. JSON

ESM-only ESM-only since 2.0.0 — last CommonJS version is 1.1.2

strnum dropped its CommonJS build in 2.0.0 (February 2025). The last version you can require() on every Node.js version, including 18 and older, is 1.1.2, published Feb 26, 2025.

On Node.js 20.19+, 22.12+ and every newer release, require("strnum") 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
2.4.2 (Aug 14, 2026)
Module format
ESM-only
Last CommonJS version
1.1.2
ESM-only since
2.0.0 (Feb 20, 2025)
TypeScript types
None
Node engines
not declared
Weekly downloads
50.1M
License
MIT

Does strnum@2.4.2 actually load? Runtime test results

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

Runtimerequire("strnum")import "strnum"
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 strnum

ES modules (import)

import strnum from "strnum";

CommonJS (require)

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

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

// Or pin the last CommonJS release:
// npm install strnum@1.1.2

Module format by version

Derived from the type, main and exports fields of every stable release on npm (25 versions; the newest 25 shown).

VersionsFormatFirst published
2.0.0 – 2.4.2ESM-onlyFeb 20, 2025
1.0.1 – 1.1.2CommonJSSep 5, 2021

Frequently asked

Is strnum ESM-only?

strnum@2.4.2 is ESM-only. strnum dropped its CommonJS build in 2.0.0 (February 2025). The last version you can require() on every Node.js version, including 18 and older, is 1.1.2, published Feb 26, 2025.

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

1.1.2 is the last version of strnum with a CommonJS build. Install it with "npm install strnum@1.1.2". Every version from 2.0.0 on is ESM-only.

How do I use strnum from a CommonJS file?

Use a dynamic import: const mod = await import("strnum"). On Node.js 20.19+, 22.12+ and newer, a plain require("strnum") also works for ESM packages that do not use top-level await. Alternatively pin strnum@1.1.2.

Does strnum work in Bun?

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

Does strnum ship TypeScript types?

No. strnum ships no type declarations and there is no @types package for it.

Links

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