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Is es-module-lexer ESM-only? Can you require() it?

Lexes ES modules returning their import/export metadata

Last verified Sep 9, 2026 against es-module-lexer@3.0.2. Markdown · JSON

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

es-module-lexer publishes both a CommonJS entry and a native ESM entry (ESM added in 0.1.2). require("es-module-lexer") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "es-module-lexer" works alongside it.

What to do

  1. Nothing to change. require("es-module-lexer") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import * as esModuleLexer from "es-module-lexer" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
3.0.2 (Sep 7, 2026)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
3.0.2
Native ESM since
0.1.2
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
113.9M
License
MIT

Does es-module-lexer@3.0.2 actually load? Runtime test results

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

Runtimerequire("es-module-lexer")import "es-module-lexer"
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 es-module-lexer

ES modules (import)

import * as esModuleLexer from "es-module-lexer";

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

CommonJS (require)

const esModuleLexer = require("es-module-lexer");

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 (79 versions; the newest 60 shown).

VersionsFormatFirst published
0.7.0 – 3.0.2Dual (CommonJS + ESM)Jul 5, 2021
0.3.17 – 0.6.0CommonJSFeb 18, 2020
0.3.15 – 0.3.16Dual (CommonJS + ESM)Feb 12, 2020

Frequently asked

Is es-module-lexer ESM-only?

es-module-lexer@3.0.2 ships CommonJS and ESM builds. es-module-lexer publishes both a CommonJS entry and a native ESM entry (ESM added in 0.1.2). require("es-module-lexer") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "es-module-lexer" works alongside it.

Can I require es-module-lexer?

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

Does es-module-lexer work in Bun?

Yes. import "es-module-lexer" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does es-module-lexer ship TypeScript types?

Yes. es-module-lexer bundles its own type declarations; no @types package is needed.

Links

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