# Is fill-range ESM-only? Can you require() it?

> fill-range@7.1.1 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Fill in a range of numbers or letters, optionally passing an increment or `step` to use, or create a regex-compatible range with `options.toRegex`

Last verified Sep 9, 2026 against fill-range@7.1.1.

fill-range ships CommonJS only. require("fill-range") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=8. import "fill-range" 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("fill-range") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=8.
2. From ES modules use the default import: import fillRange from "fill-range"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: npm install -D @types/fill-range

## Facts

- Latest: 7.1.1 (May 21, 2024)
- Module format: CommonJS
- Last CommonJS version: 7.1.1
- TypeScript types: @types/fill-range
- Node engines: >=8
- Weekly downloads: 116.7M
- License: MIT

## Runtime test results for fill-range@7.1.1

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

| Runtime | require("fill-range") | import "fill-range" |
|---|---|---|
| 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 fill-range

ES modules:

```js
import fillRange from "fill-range";
```

CommonJS:

```js
const fillRange = require("fill-range");
```

## 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 |
|---|---|---|
| 0.1.0 – 7.1.1 | CommonJS | Nov 25, 2014 |

## Frequently asked

**Is fill-range ESM-only?**

fill-range@7.1.1 is a CommonJS package. fill-range ships CommonJS only. require("fill-range") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=8. import "fill-range" 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 fill-range with ES module syntax?**

Yes. import fillRange from "fill-range" 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 fill-range work in Bun?**

Yes. import "fill-range" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does fill-range ship TypeScript types?**

Not bundled. Install the community types with "npm install -D @types/fill-range".

## Links

- [fill-range on npm](https://www.npmjs.com/package/fill-range)
- [Source repository](https://github.com/jonschlinkert/fill-range)
- [HTML version](https://canirequire.com/package/fill-range/)
- [JSON version](https://canirequire.com/package/fill-range.json)

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