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Is std-env ESM-only? Can you require() it?

Runtime agnostic JS utils

Last verified Sep 9, 2026 against std-env@4.2.0. JSON

ESM-only ESM-only since 4.0.0 — last CommonJS version is 3.10.0

std-env dropped its CommonJS build in 4.0.0 (March 2026). The last version you can require() on every Node.js version, including 18 and older, is 3.10.0, published Oct 14, 2025.

On Node.js 20.19+, 22.12+ and every newer release, require("std-env") 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
4.2.0 (Jul 7, 2026)
Module format
ESM-only
Last CommonJS version
3.10.0
ESM-only since
4.0.0 (Mar 10, 2026)
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
97.9M
License
MIT

Does std-env@4.2.0 actually load? Runtime test results

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

Runtimerequire("std-env")import "std-env"
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 std-env

ES modules (import)

import stdEnv from "std-env";

CommonJS (require)

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

// Any Node.js version:
const stdEnv = await import("std-env");

// Or pin the last CommonJS release:
// npm install std-env@3.10.0

Module format by version

Derived from the type, main and exports fields of every stable release on npm (37 versions; the newest 37 shown).

VersionsFormatFirst published
4.0.0 – 4.2.0ESM-onlyMar 10, 2026
3.0.0 – 3.10.0Dual (CommonJS + ESM)Nov 3, 2021
1.0.0 – 2.3.1CommonJSMar 30, 2018

Frequently asked

Is std-env ESM-only?

std-env@4.2.0 is ESM-only. std-env dropped its CommonJS build in 4.0.0 (March 2026). The last version you can require() on every Node.js version, including 18 and older, is 3.10.0, published Oct 14, 2025.

Which version of std-env still supports CommonJS / require()?

3.10.0 is the last version of std-env with a CommonJS build. Install it with "npm install std-env@3.10.0". Every version from 4.0.0 on is ESM-only.

How do I use std-env from a CommonJS file?

Use a dynamic import: const mod = await import("std-env"). On Node.js 20.19+, 22.12+ and newer, a plain require("std-env") also works for ESM packages that do not use top-level await. Alternatively pin std-env@3.10.0.

Does std-env work in Bun?

Yes. import "std-env" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does std-env ship TypeScript types?

Yes. std-env bundles its own type declarations; no @types package is needed.

Links

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