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Is sisteransi ESM-only? Can you require() it?

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Last verified Sep 9, 2026 against sisteransi@2.0.0. JSON

ESM-only ESM-only since 2.0.0 — last CommonJS version is 1.0.5

sisteransi dropped its CommonJS build in 2.0.0 (June 2026). The last version you can require() on every Node.js version, including 18 and older, is 1.0.5, published Mar 18, 2020.

On Node.js 20.19+, 22.12+ and every newer release, require("sisteransi") 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.

sisteransi@2.0.0 declares engines ">=20", so Node.js 18 is outside its supported range regardless of module format.

Latest
2.0.0 (Jun 25, 2026)
Module format
ESM-only
Last CommonJS version
1.0.5
ESM-only since
2.0.0 (Jun 25, 2026)
TypeScript types
Bundled
Node engines
>=20
Weekly downloads
48.4M
License
MIT

Does sisteransi@2.0.0 actually load? Runtime test results

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

Runtimerequire("sisteransi")import "sisteransi"
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 sisteransi

ES modules (import)

import sisteransi from "sisteransi";

CommonJS (require)

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

// Any Node.js version:
const sisteransi = await import("sisteransi");

// Or pin the last CommonJS release:
// npm install sisteransi@1.0.5

Module format by version

Derived from the type, main and exports fields of every stable release on npm (10 versions; the newest 10 shown).

VersionsFormatFirst published
2.0.0ESM-onlyJun 25, 2026
0.0.0 – 1.0.5CommonJSFeb 20, 2018

Frequently asked

Is sisteransi ESM-only?

sisteransi@2.0.0 is ESM-only. sisteransi dropped its CommonJS build in 2.0.0 (June 2026). The last version you can require() on every Node.js version, including 18 and older, is 1.0.5, published Mar 18, 2020.

Which version of sisteransi still supports CommonJS / require()?

1.0.5 is the last version of sisteransi with a CommonJS build. Install it with "npm install sisteransi@1.0.5". Every version from 2.0.0 on is ESM-only.

How do I use sisteransi from a CommonJS file?

Use a dynamic import: const mod = await import("sisteransi"). On Node.js 20.19+, 22.12+ and newer, a plain require("sisteransi") also works for ESM packages that do not use top-level await. Alternatively pin sisteransi@1.0.5.

Does sisteransi work in Bun?

Yes. import "sisteransi" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does sisteransi ship TypeScript types?

Yes. sisteransi bundles its own type declarations; no @types package is needed.

Links

Other esm-only packages

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