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

> get-proto@1.0.1 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Robustly get the [[Prototype]] of an object

Last verified Sep 9, 2026 against get-proto@1.0.1.

get-proto ships CommonJS only. require("get-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 "get-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("get-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 getProto from "get-proto"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 1.0.1 (Jan 2, 2025)
- Module format: CommonJS
- Last CommonJS version: 1.0.1
- TypeScript types: bundled
- Node engines: >= 0.4
- Weekly downloads: 122.0M
- License: MIT

## Runtime test results for get-proto@1.0.1

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

| Runtime | require("get-proto") | import "get-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 get-proto

ES modules:

```js
import getProto from "get-proto";
```

CommonJS:

```js
const getProto = require("get-proto");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (2 versions; the newest 2 shown).

| Versions | Format | First published |
|---|---|---|
| 1.0.0 – 1.0.1 | CommonJS | Jan 2, 2025 |

## Frequently asked

**Is get-proto ESM-only?**

get-proto@1.0.1 is a CommonJS package. get-proto ships CommonJS only. require("get-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 "get-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 get-proto with ES module syntax?**

Yes. import getProto from "get-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 get-proto work in Bun?**

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

**Does get-proto ship TypeScript types?**

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

## Links

- [get-proto on npm](https://www.npmjs.com/package/get-proto)
- [Source repository](https://github.com/ljharb/get-proto)
- [HTML version](https://canirequire.com/package/get-proto/)
- [JSON version](https://canirequire.com/package/get-proto.json)

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