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Is has-proto ESM-only? Can you require() it?

Does this environment have the ability to get the [[Prototype]] of an object on creation with `__proto__`?

Last verified Sep 9, 2026 against has-proto@1.2.0. Markdown · JSON

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

has-proto ships CommonJS only. require("has-proto") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4. import "has-proto" 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("has-proto") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4.
  2. From ES modules use the default import: import hasProto from "has-proto"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
1.2.0 (Dec 6, 2024)
Module format
CommonJS
Last CommonJS version
1.2.0
TypeScript types
Bundled
Node engines
>= 0.4
Weekly downloads
75.9M
License
MIT

Does has-proto@1.2.0 actually load? Runtime test results

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

Runtimerequire("has-proto")import "has-proto"
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 has-proto

ES modules (import)

import hasProto from "has-proto";

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 hasProto = require("has-proto");

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 (6 versions; the newest 6 shown).

VersionsFormatFirst published
1.0.0 – 1.2.0CommonJSDec 13, 2022

Frequently asked

Is has-proto ESM-only?

has-proto@1.2.0 is a CommonJS package. has-proto ships CommonJS only. require("has-proto") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4. import "has-proto" 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 has-proto with ES module syntax?

Yes. import hasProto from "has-proto" 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 has-proto work in Bun?

Yes. import "has-proto" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does has-proto ship TypeScript types?

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

Links

Other commonjs packages

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