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

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Last verified Sep 9, 2026 against psl@1.15.0. Markdown · JSON

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

psl publishes both a CommonJS entry and a native ESM entry (ESM added in 1.11.0). require("psl") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "psl" works alongside it.

What to do

  1. Nothing to change. require("psl") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import * as psl from "psl" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
1.15.0 (Dec 2, 2024)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
1.15.0
Native ESM since
1.11.0
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
36.7M
License
MIT

Does psl@1.15.0 actually load? Runtime test results

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

Runtimerequire("psl")import "psl"
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 psl

ES modules (import)

import * as psl from "psl";

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

CommonJS (require)

const psl = require("psl");

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 (52 versions; the newest 52 shown).

VersionsFormatFirst published
1.13.0 – 1.15.0Dual (CommonJS + ESM)Nov 21, 2024
1.12.0CommonJSNov 21, 2024
1.11.0Dual (CommonJS + ESM)Nov 21, 2024
1.0.0 – 1.10.0CommonJSOct 14, 2014

Frequently asked

Is psl ESM-only?

psl@1.15.0 ships CommonJS and ESM builds. psl publishes both a CommonJS entry and a native ESM entry (ESM added in 1.11.0). require("psl") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "psl" works alongside it.

Can I require psl?

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

Does psl work in Bun?

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

Does psl ship TypeScript types?

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

Links

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