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Is strip-indent ESM-only? Can you require() it?

Strip leading whitespace from each line in a string

Last verified Sep 9, 2026 against strip-indent@4.1.1. JSON

ESM-only ESM-only since 4.0.0 — last CommonJS version is 3.0.0

strip-indent dropped its CommonJS build in 4.0.0 (May 2021). The last version you can require() on every Node.js version, including 18 and older, is 3.0.0, published Apr 17, 2019.

On Node.js 20.19+, 22.12+ and every newer release, require("strip-indent") 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
4.1.1 (Oct 12, 2025)
Module format
ESM-only
Last CommonJS version
3.0.0
ESM-only since
4.0.0 (May 3, 2021)
TypeScript types
Bundled
Node engines
>=12
Weekly downloads
62.9M
License
MIT

Does strip-indent@4.1.1 actually load? Runtime test results

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

Runtimerequire("strip-indent")import "strip-indent"
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 strip-indent

ES modules (import)

import stripIndent from "strip-indent";

CommonJS (require)

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

// Any Node.js version:
const stripIndent = await import("strip-indent");

// Or pin the last CommonJS release:
// npm install strip-indent@3.0.0

Module format by version

Derived from the type, main and exports fields of every stable release on npm (11 versions; the newest 11 shown).

VersionsFormatFirst published
4.0.0 – 4.1.1ESM-onlyMay 3, 2021
0.1.0 – 3.0.0CommonJSMar 29, 2014

Frequently asked

Is strip-indent ESM-only?

strip-indent@4.1.1 is ESM-only. strip-indent dropped its CommonJS build in 4.0.0 (May 2021). The last version you can require() on every Node.js version, including 18 and older, is 3.0.0, published Apr 17, 2019.

Which version of strip-indent still supports CommonJS / require()?

3.0.0 is the last version of strip-indent with a CommonJS build. Install it with "npm install strip-indent@3.0.0". Every version from 4.0.0 on is ESM-only.

How do I use strip-indent from a CommonJS file?

Use a dynamic import: const mod = await import("strip-indent"). On Node.js 20.19+, 22.12+ and newer, a plain require("strip-indent") also works for ESM packages that do not use top-level await. Alternatively pin strip-indent@3.0.0.

Does strip-indent work in Bun?

Yes. import "strip-indent" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does strip-indent ship TypeScript types?

Yes. strip-indent bundles its own type declarations; no @types package is needed.

Links

Other esm-only packages

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