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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. Markdown · 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 with a plain require()-able CommonJS entry is 3.10.0, published Oct 14, 2025.

On Node.js 20.19+, 22.12+ and newer, require("std-env") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. On Node.js 18, which has no require(esm), require("std-env") fails with ERR_REQUIRE_ESM.

What to do

  1. On Node.js 20.19+, 22.12+ and newer, require("std-env") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26.
  2. From a CommonJS file, use a dynamic import inside an async function: const stdEnv = await import("std-env"). That works on every Node.js version the package supports.
  3. If you need a synchronous require() or run Node.js 18: npm install std-env@3.10.0, the last CommonJS release (published Oct 14, 2025).
  4. TypeScript: types are bundled; install nothing extra.
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 1.4.0✓ works✓ works

How to import std-env

ES modules (import)

import * as stdEnv from "std-env";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

// Node.js 20.19+, 22.12+ and newer (verified):
const stdEnv = require("std-env");

// Any Node.js version the package supports, from an async function:
async function main() {
  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, corrected where a runtime test of that version contradicted them (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 with a plain require()-able CommonJS entry 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?

From a CommonJS file, use a dynamic import inside an async function: const stdEnv = await import("std-env"). That works on every Node.js version the package supports. On Node.js 20.19+, 22.12+ and newer, require("std-env") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin std-env@3.10.0.

Does std-env work in Bun?

Yes. import "std-env" loaded successfully in Bun 1.4.0 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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