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Is less-loader ESM-only? Can you require() it?

A Less loader for webpack. Compiles Less to CSS.

Last verified Sep 9, 2026 against less-loader@13.0.0. Markdown · JSON

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

less-loader publishes both a CommonJS entry and a native ESM entry (ESM added in 13.0.0). require("less-loader") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 22.11.0. import "less-loader" works alongside it.

What to do

  1. Nothing to change. require("less-loader") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 22.11.0. import * as lessLoader from "less-loader" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
13.0.0 (May 20, 2026)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
13.0.0
Native ESM since
13.0.0
TypeScript types
Bundled
Node engines
>= 22.11.0
Weekly downloads
6.2M
License
MIT

Does less-loader@13.0.0 actually load? Runtime test results

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

Runtimerequire("less-loader")import "less-loader"
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 less-loader

ES modules (import)

import * as lessLoader from "less-loader";

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

CommonJS (require)

const lessLoader = require("less-loader");

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 (73 versions; the newest 60 shown).

VersionsFormatFirst published
13.0.0Dual (CommonJS + ESM)May 20, 2026
0.7.1 – 12.3.3CommonJSJan 28, 2014

Frequently asked

Is less-loader ESM-only?

less-loader@13.0.0 ships CommonJS and ESM builds. less-loader publishes both a CommonJS entry and a native ESM entry (ESM added in 13.0.0). require("less-loader") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 22.11.0. import "less-loader" works alongside it.

Can I require less-loader?

Yes. less-loader ships a CommonJS entry alongside the native ESM entry. require("less-loader") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 22.11.0.

Does less-loader work in Bun?

Yes. import "less-loader" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does less-loader ship TypeScript types?

Yes. less-loader bundles its own type declarations; no @types package is needed.

Links

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