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

> toformat@2.0.0 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Adds a `toFormat` instance method to decimal.js or big.js

Last verified Sep 9, 2026 against toformat@2.0.0.

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

## Facts

- Latest: 2.0.0 (Oct 16, 2017)
- Module format: CommonJS
- Last CommonJS version: 2.0.0
- TypeScript types: none
- Node engines: not declared
- Weekly downloads: 254K
- License: MIT

## Runtime test results for toformat@2.0.0

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

| Runtime | require("toformat") | import "toformat" |
|---|---|---|
| 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 toformat

ES modules:

```js
import toformat from "toformat";
```

CommonJS:

```js
const toformat = require("toformat");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (2 versions; the newest 2 shown).

| Versions | Format | First published |
|---|---|---|
| 1.0.0 – 2.0.0 | CommonJS | Feb 10, 2016 |

## Frequently asked

**Is toformat ESM-only?**

toformat@2.0.0 is a CommonJS package. toformat ships CommonJS only. require("toformat") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "toformat" 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 toformat with ES module syntax?**

Yes. import toformat from "toformat" 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 toformat work in Bun?**

Yes. import "toformat" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does toformat ship TypeScript types?**

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

## Links

- [toformat on npm](https://www.npmjs.com/package/toformat)
- [Source repository](https://github.com/MikeMcl/toFormat)
- [HTML version](https://canirequire.com/package/toformat/)
- [JSON version](https://canirequire.com/package/toformat.json)

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