# Is karma-coverage-istanbul-reporter ESM-only? Can you require() it?

> karma-coverage-istanbul-reporter@3.0.3 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

A karma reporter that uses the latest istanbul 1.x APIs (with full sourcemap support) to report coverage.

Last verified Sep 9, 2026 against karma-coverage-istanbul-reporter@3.0.3.

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

## Facts

- Latest: 3.0.3 (May 28, 2020)
- Module format: CommonJS
- Last CommonJS version: 3.0.3
- TypeScript types: @types/karma-coverage-istanbul-reporter
- Node engines: not declared
- Weekly downloads: 457K
- License: MIT

## Runtime test results for karma-coverage-istanbul-reporter@3.0.3

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

| Runtime | require("karma-coverage-istanbul-reporter") | import "karma-coverage-istanbul-reporter" |
|---|---|---|
| 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-coverage-istanbul-reporter

ES modules:

```js
import karmaCoverageIstanbulReporter from "karma-coverage-istanbul-reporter";
```

CommonJS:

```js
const karmaCoverageIstanbulReporter = require("karma-coverage-istanbul-reporter");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (31 versions; the newest 31 shown).

| Versions | Format | First published |
|---|---|---|
| 0.1.0 – 3.0.3 | CommonJS | Jan 25, 2017 |

## Frequently asked

**Is karma-coverage-istanbul-reporter ESM-only?**

karma-coverage-istanbul-reporter@3.0.3 is a CommonJS package. karma-coverage-istanbul-reporter ships CommonJS only. require("karma-coverage-istanbul-reporter") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "karma-coverage-istanbul-reporter" 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-coverage-istanbul-reporter with ES module syntax?**

Yes. import karmaCoverageIstanbulReporter from "karma-coverage-istanbul-reporter" 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-coverage-istanbul-reporter work in Bun?**

Yes. import "karma-coverage-istanbul-reporter" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does karma-coverage-istanbul-reporter ship TypeScript types?**

Not bundled. Install the community types with "npm install -D @types/karma-coverage-istanbul-reporter".

## Links

- [karma-coverage-istanbul-reporter on npm](https://www.npmjs.com/package/karma-coverage-istanbul-reporter)
- [Source repository](https://github.com/mattlewis92/karma-coverage-istanbul-reporter)
- [HTML version](https://canirequire.com/package/karma-coverage-istanbul-reporter/)
- [JSON version](https://canirequire.com/package/karma-coverage-istanbul-reporter.json)

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