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

loader.js =========

Last verified Sep 9, 2026 against loader.js@4.7.0. JSON

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

loader.js ships CommonJS only. require("loader.js") works everywhere. import "loader.js" 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.

Latest
4.7.0 (Apr 11, 2018)
Module format
CommonJS
Last CommonJS version
4.7.0
TypeScript types
None
Node engines
not declared
Weekly downloads
188K
License
MIT

Does loader.js@4.7.0 actually load? Runtime test results

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

Runtimerequire("loader.js")import "loader.js"
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✓ works✓ works

How to import loader.js

ES modules (import)

import loaderJs from "loader.js";

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 loaderJs = require("loader.js");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (30 versions; the newest 30 shown).

VersionsFormatFirst published
3.1.0 – 4.7.0CommonJSFeb 4, 2015

Frequently asked

Is loader.js ESM-only?

loader.js@4.7.0 is a CommonJS package. loader.js ships CommonJS only. require("loader.js") works everywhere. import "loader.js" 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 loader.js with ES module syntax?

Yes. import loaderJs from "loader.js" 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 loader.js work in Bun?

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

Does loader.js ship TypeScript types?

No. loader.js ships no type declarations and there is no @types package for it.

Links

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