# Is karma-sinon-chai ESM-only? Can you require() it?

> karma-sinon-chai@2.0.2 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Sinon and Chai for Karma

Last verified Sep 9, 2026 against karma-sinon-chai@2.0.2.

karma-sinon-chai ships CommonJS only. require("karma-sinon-chai") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "karma-sinon-chai" 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("karma-sinon-chai") 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 karmaSinonChai from "karma-sinon-chai"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: npm install -D @types/karma-sinon-chai

## Facts

- Latest: 2.0.2 (Jul 6, 2018)
- Module format: CommonJS
- Last CommonJS version: 2.0.2
- TypeScript types: @types/karma-sinon-chai
- Node engines: not declared
- Weekly downloads: 60K
- License: MIT

## Runtime test results for karma-sinon-chai@2.0.2

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

| Runtime | require("karma-sinon-chai") | import "karma-sinon-chai" |
|---|---|---|
| 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 karma-sinon-chai

ES modules:

```js
import karmaSinonChai from "karma-sinon-chai";
```

CommonJS:

```js
const karmaSinonChai = require("karma-sinon-chai");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (27 versions; the newest 27 shown).

| Versions | Format | First published |
|---|---|---|
| 0.0.0 – 2.0.2 | CommonJS | Aug 2, 2013 |

## Frequently asked

**Is karma-sinon-chai ESM-only?**

karma-sinon-chai@2.0.2 is a CommonJS package. karma-sinon-chai ships CommonJS only. require("karma-sinon-chai") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "karma-sinon-chai" 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 karma-sinon-chai with ES module syntax?**

Yes. import karmaSinonChai from "karma-sinon-chai" 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 karma-sinon-chai work in Bun?**

Yes. import "karma-sinon-chai" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does karma-sinon-chai ship TypeScript types?**

Not bundled. Install the community types with "npm install -D @types/karma-sinon-chai".

## Links

- [karma-sinon-chai on npm](https://www.npmjs.com/package/karma-sinon-chai)
- [Source repository](https://github.com/kmees/karma-sinon-chai)
- [HTML version](https://canirequire.com/package/karma-sinon-chai/)
- [JSON version](https://canirequire.com/package/karma-sinon-chai.json)

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