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Is which-builtin-type ESM-only? Can you require() it?

What is the type of this builtin JS value?

Last verified Sep 9, 2026 against which-builtin-type@1.2.1. JSON

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

which-builtin-type ships CommonJS only. require("which-builtin-type") works everywhere. import "which-builtin-type" 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
1.2.1 (Dec 13, 2024)
Module format
CommonJS
Last CommonJS version
1.2.1
TypeScript types
Bundled
Node engines
>= 0.4
Weekly downloads
68.7M
License
MIT

Does which-builtin-type@1.2.1 actually load? Runtime test results

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

Runtimerequire("which-builtin-type")import "which-builtin-type"
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 which-builtin-type

ES modules (import)

import whichBuiltinType from "which-builtin-type";

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 whichBuiltinType = require("which-builtin-type");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (9 versions; the newest 9 shown).

VersionsFormatFirst published
1.0.0 – 1.2.1CommonJSJan 25, 2020

Frequently asked

Is which-builtin-type ESM-only?

which-builtin-type@1.2.1 is a CommonJS package. which-builtin-type ships CommonJS only. require("which-builtin-type") works everywhere. import "which-builtin-type" 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 which-builtin-type with ES module syntax?

Yes. import whichBuiltinType from "which-builtin-type" 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 which-builtin-type work in Bun?

Yes. import "which-builtin-type" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does which-builtin-type ship TypeScript types?

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

Links

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