# Is deep-is ESM-only? Can you require() it?

> deep-is@0.1.4 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

node's assert.deepEqual algorithm except for NaN being equal to NaN

Last verified Sep 9, 2026 against deep-is@0.1.4.

deep-is ships CommonJS only. require("deep-is") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "deep-is" 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("deep-is") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
2. From ES modules use the default import: import deepIs from "deep-is"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: no types are available for deep-is; declare the module yourself if you need them.

## Facts

- Latest: 0.1.4 (Sep 4, 2021)
- Module format: CommonJS
- Last CommonJS version: 0.1.4
- TypeScript types: none
- Node engines: not declared
- Weekly downloads: 96.9M
- License: MIT

## Runtime test results for deep-is@0.1.4

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

| Runtime | require("deep-is") | import "deep-is" |
|---|---|---|
| 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 deep-is

ES modules:

```js
import deepIs from "deep-is";
```

CommonJS:

```js
const deepIs = require("deep-is");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (5 versions; the newest 5 shown).

| Versions | Format | First published |
|---|---|---|
| 0.1.0 – 0.1.4 | CommonJS | Apr 11, 2013 |

## Frequently asked

**Is deep-is ESM-only?**

deep-is@0.1.4 is a CommonJS package. deep-is ships CommonJS only. require("deep-is") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "deep-is" 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 deep-is with ES module syntax?**

Yes. import deepIs from "deep-is" 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 deep-is work in Bun?**

Yes. import "deep-is" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does deep-is ship TypeScript types?**

No. deep-is ships no type declarations and there is no @types package for it.

## Links

- [deep-is on npm](https://www.npmjs.com/package/deep-is)
- [Source repository](https://github.com/thlorenz/deep-is)
- [HTML version](https://canirequire.com/package/deep-is/)
- [JSON version](https://canirequire.com/package/deep-is.json)

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