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Is prelude-ls ESM-only? Can you require() it?

prelude.ls is a functionally oriented utility library. It is powerful and flexible. Almost all of its functions are curried. It is written in, and is the recommended base library for, LiveScript.

Last verified Sep 9, 2026 against prelude-ls@1.2.1. Markdown · JSON

CommonJS CommonJS — require() works on every Node.js version we test

prelude-ls ships CommonJS only. require("prelude-ls") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.8.0. import "prelude-ls" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

What to do

  1. require("prelude-ls") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.8.0.
  2. From ES modules use the default import: import preludeLs from "prelude-ls"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: npm install -D @types/prelude-ls
Latest
1.2.1 (Apr 2, 2020)
Module format
CommonJS
Last CommonJS version
1.2.1
TypeScript types
@types/prelude-ls
Node engines
>= 0.8.0
Weekly downloads
101.4M
License
MIT

Does prelude-ls@1.2.1 actually load? Runtime test results

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

Runtimerequire("prelude-ls")import "prelude-ls"
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 prelude-ls

ES modules (import)

import preludeLs from "prelude-ls";

Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.

CommonJS (require)

const preludeLs = require("prelude-ls");

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 (14 versions; the newest 14 shown).

VersionsFormatFirst published
0.2.0 – 1.2.1CommonJSMay 29, 2012

Frequently asked

Is prelude-ls ESM-only?

prelude-ls@1.2.1 is a CommonJS package. prelude-ls ships CommonJS only. require("prelude-ls") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.8.0. import "prelude-ls" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Can I import prelude-ls with ES module syntax?

Yes. import preludeLs from "prelude-ls" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

Does prelude-ls work in Bun?

Yes. import "prelude-ls" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does prelude-ls ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/prelude-ls".

Links

Other commonjs packages

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