# Is diff-sequences ESM-only? Can you require() it?

> diff-sequences@29.6.3 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Compare items in two sequences to find a longest common subsequence

Last verified Sep 9, 2026 against diff-sequences@29.6.3.

diff-sequences ships CommonJS only. require("diff-sequences") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^14.15.0 || ^16.10.0 || >=18.0.0. import "diff-sequences" 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("diff-sequences") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^14.15.0 || ^16.10.0 || >=18.0.0.
2. From ES modules use the default import: import diffSequences from "diff-sequences"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 29.6.3 (Aug 21, 2023)
- Module format: CommonJS
- Last CommonJS version: 29.6.3
- TypeScript types: bundled
- Node engines: ^14.15.0 || ^16.10.0 || >=18.0.0
- Weekly downloads: 41.5M
- License: MIT

## Runtime test results for diff-sequences@29.6.3

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

| Runtime | require("diff-sequences") | import "diff-sequences" |
|---|---|---|
| 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 diff-sequences

ES modules:

```js
import diffSequences from "diff-sequences";
```

CommonJS:

```js
const diffSequences = require("diff-sequences");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (33 versions; the newest 33 shown).

| Versions | Format | First published |
|---|---|---|
| 0.0.0 – 29.6.3 | CommonJS | Feb 7, 2018 |

## Frequently asked

**Is diff-sequences ESM-only?**

diff-sequences@29.6.3 is a CommonJS package. diff-sequences ships CommonJS only. require("diff-sequences") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^14.15.0 || ^16.10.0 || >=18.0.0. import "diff-sequences" 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 diff-sequences with ES module syntax?**

Yes. import diffSequences from "diff-sequences" 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 diff-sequences work in Bun?**

Yes. import "diff-sequences" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does diff-sequences ship TypeScript types?**

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

## Links

- [diff-sequences on npm](https://www.npmjs.com/package/diff-sequences)
- [Source repository](https://github.com/jestjs/jest)
- [HTML version](https://canirequire.com/package/diff-sequences/)
- [JSON version](https://canirequire.com/package/diff-sequences.json)

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