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Is ast-types ESM-only? Can you require() it?

Esprima-compatible implementation of the Mozilla JS Parser API

Last verified Sep 9, 2026 against ast-types@0.16.3. Markdown · JSON

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

ast-types ships CommonJS only. require("ast-types") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=4. import "ast-types" 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("ast-types") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=4.
  2. From ES modules use the default import: import astTypes from "ast-types"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
0.16.3 (Aug 30, 2026)
Module format
CommonJS
Last CommonJS version
0.16.3
TypeScript types
Bundled
Node engines
>=4
Weekly downloads
59.8M
License
MIT

Does ast-types@0.16.3 actually load? Runtime test results

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

Runtimerequire("ast-types")import "ast-types"
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 ast-types

ES modules (import)

import astTypes from "ast-types";

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 astTypes = require("ast-types");

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 (174 versions; the newest 60 shown).

VersionsFormatFirst published
0.8.5 – 0.16.3CommonJSJul 30, 2015

Frequently asked

Is ast-types ESM-only?

ast-types@0.16.3 is a CommonJS package. ast-types ships CommonJS only. require("ast-types") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=4. import "ast-types" 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 ast-types with ES module syntax?

Yes. import astTypes from "ast-types" 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 ast-types work in Bun?

Yes. import "ast-types" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does ast-types ship TypeScript types?

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

Links

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