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

Indent each line in a string

Last verified Sep 9, 2026 against indent-string@5.0.0. JSON

ESM-only ESM-only since 5.0.0 — last CommonJS version is 4.0.0

indent-string dropped its CommonJS build in 5.0.0 (April 2021). The last version you can require() on every Node.js version, including 18 and older, is 4.0.0, published Apr 17, 2019.

On Node.js 20.19+, 22.12+ and every newer release, require("indent-string") 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
5.0.0 (Apr 17, 2021)
Module format
ESM-only
Last CommonJS version
4.0.0
ESM-only since
5.0.0 (Apr 17, 2021)
TypeScript types
@types/indent-string
Node engines
>=12
Weekly downloads
94.0M
License
MIT

Does indent-string@5.0.0 actually load? Runtime test results

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

Runtimerequire("indent-string")import "indent-string"
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 indent-string

ES modules (import)

import indentString from "indent-string";

CommonJS (require)

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

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

// Or pin the last CommonJS release:
// npm install indent-string@4.0.0

Module format by version

Derived from the type, main and exports fields of every stable release on npm (16 versions; the newest 16 shown).

VersionsFormatFirst published
5.0.0ESM-onlyApr 17, 2021
0.1.0 – 4.0.0CommonJSJun 6, 2014

Frequently asked

Is indent-string ESM-only?

indent-string@5.0.0 is ESM-only. indent-string dropped its CommonJS build in 5.0.0 (April 2021). The last version you can require() on every Node.js version, including 18 and older, is 4.0.0, published Apr 17, 2019.

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

4.0.0 is the last version of indent-string with a CommonJS build. Install it with "npm install indent-string@4.0.0". Every version from 5.0.0 on is ESM-only.

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

Use a dynamic import: const mod = await import("indent-string"). On Node.js 20.19+, 22.12+ and newer, a plain require("indent-string") also works for ESM packages that do not use top-level await. Alternatively pin indent-string@4.0.0.

Does indent-string work in Bun?

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

Does indent-string ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/indent-string".

Links

Other esm-only packages

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