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Is slice-ansi ESM-only? Can you require() it?

Slice a string with ANSI escape codes

Last verified Sep 9, 2026 against slice-ansi@9.0.0. Markdown · JSON

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

slice-ansi dropped its CommonJS build in 5.0.0 (April 2021). The last version with a plain require()-able CommonJS entry is 4.0.0, published Feb 16, 2020; it declares support for Node.js >=10.

On Node.js 22.12+ and newer (slice-ansi@9.0.0 declares Node.js >=22), require("slice-ansi") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 22, 24 and 26. Node.js 18 has no require(esm), and slice-ansi@9.0.0 declares Node.js >=22, so 18 is outside its supported range anyway.

slice-ansi@9.0.0 declares engines ">=22", so Node.js 18, 20 are outside its supported range regardless of module format.

What to do

  1. On Node.js 22.12+ and newer (slice-ansi@9.0.0 declares Node.js >=22), require("slice-ansi") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 22, 24 and 26.
  2. From a CommonJS file, use a dynamic import inside an async function: const sliceAnsi = await import("slice-ansi"). That works on every Node.js version the package supports (>=22).
  3. If you need a synchronous require() or run Node.js 18: npm install slice-ansi@4.0.0, the last CommonJS release (published Feb 16, 2020); it declares Node.js >=10.
  4. slice-ansi@9.0.0 declares engines ">=22", so Node.js 18, 20 are unsupported regardless: upgrade Node.js or pin an older release.
  5. TypeScript: types are bundled; install nothing extra.
Latest
9.0.0 (Apr 4, 2026)
Module format
ESM-only
Last CommonJS version
4.0.0
ESM-only since
5.0.0 (Apr 16, 2021)
TypeScript types
Bundled
Node engines
>=22
Weekly downloads
101.8M
License
MIT

Does slice-ansi@9.0.0 actually load? Runtime test results

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

Runtimerequire("slice-ansi")import "slice-ansi"
Node.js 18✗ failsERR_REQUIRE_ESM✗ failsSyntaxError
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 slice-ansi

ES modules (import)

import * as sliceAnsi from "slice-ansi";

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

CommonJS (require)

// Node.js 22.12+ and newer (verified):
const sliceAnsi = require("slice-ansi");

// Any Node.js version the package supports (>=22), from an async function:
async function main() {
  const sliceAnsi = await import("slice-ansi");
}

// Or pin the last CommonJS release (declares Node.js >=10):
// npm install slice-ansi@4.0.0

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 (16 versions; the newest 16 shown).

VersionsFormatFirst published
5.0.0 – 9.0.0ESM-onlyApr 16, 2021
0.0.2 – 4.0.0CommonJSSep 26, 2015

Frequently asked

Is slice-ansi ESM-only?

slice-ansi@9.0.0 is ESM-only. slice-ansi dropped its CommonJS build in 5.0.0 (April 2021). The last version with a plain require()-able CommonJS entry is 4.0.0, published Feb 16, 2020; it declares support for Node.js >=10.

Which version of slice-ansi still supports CommonJS / require()?

4.0.0 is the last version of slice-ansi with a CommonJS build; it declares Node.js >=10. Install it with "npm install slice-ansi@4.0.0". Every version from 5.0.0 on is ESM-only.

How do I use slice-ansi from a CommonJS file?

From a CommonJS file, use a dynamic import inside an async function: const sliceAnsi = await import("slice-ansi"). That works on every Node.js version the package supports (>=22). On Node.js 22.12+ and newer (slice-ansi@9.0.0 declares Node.js >=22), require("slice-ansi") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 22, 24 and 26. Alternatively pin slice-ansi@4.0.0 (declares Node.js >=10).

Does slice-ansi work in Bun?

Yes. import "slice-ansi" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does slice-ansi ship TypeScript types?

Yes. slice-ansi bundles its own type declarations; no @types package is needed.

Links

Other esm-only packages

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