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

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Last verified Sep 9, 2026 against yallist@5.0.0. Markdown · JSON

Dual (CommonJS + ESM) Dual package — require() works on every Node.js version we test; import works too

yallist publishes both a CommonJS entry and a native ESM entry (ESM added in 5.0.0). require("yallist") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18. import "yallist" works alongside it.

What to do

  1. Nothing to change. require("yallist") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18. import * as yallist from "yallist" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
5.0.0 (Apr 9, 2024)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
5.0.0
Native ESM since
5.0.0
TypeScript types
Bundled
Node engines
>=18
Weekly downloads
277.0M
License
BlueOak-1.0.0

Does yallist@5.0.0 actually load? Runtime test results

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

Runtimerequire("yallist")import "yallist"
Node.js 18✓ works✓ 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 yallist

ES modules (import)

import * as yallist from "yallist";

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

CommonJS (require)

const yallist = require("yallist");

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 (17 versions; the newest 17 shown).

VersionsFormatFirst published
5.0.0Dual (CommonJS + ESM)Apr 9, 2024
1.0.0 – 4.0.0CommonJSDec 18, 2015

Frequently asked

Is yallist ESM-only?

yallist@5.0.0 ships CommonJS and ESM builds. yallist publishes both a CommonJS entry and a native ESM entry (ESM added in 5.0.0). require("yallist") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18. import "yallist" works alongside it.

Can I require yallist?

Yes. yallist ships a CommonJS entry alongside the native ESM entry. require("yallist") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18.

Does yallist work in Bun?

Yes. import "yallist" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does yallist ship TypeScript types?

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

Links

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