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

> minizlib@3.1.0 ships CommonJS and ESM builds. Dual package — require() works on every Node.js version we test; import works too.

A small fast zlib stream built on [minipass](http://npm.im/minipass) and Node.js's zlib binding.

Last verified Sep 9, 2026 against minizlib@3.1.0.

minizlib publishes both a CommonJS entry and a native ESM entry (ESM added in 3.0.0). require("minizlib") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 18. import "minizlib" works alongside it.

## What to do

1. Nothing to change. require("minizlib") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 18. import * as minizlib from "minizlib" works alongside it; use named imports for what the ESM entry exports.
2. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 3.1.0 (Sep 21, 2025)
- Module format: Dual (CommonJS + ESM)
- Last CommonJS version: 3.1.0
- Native ESM since: 3.0.0
- TypeScript types: bundled
- Node engines: >= 18
- Weekly downloads: 56.7M
- License: MIT

## Runtime test results for minizlib@3.1.0

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

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

ES modules:

```js
import * as minizlib from "minizlib";
```

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS:

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

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (23 versions; the newest 23 shown).

| Versions | Format | First published |
|---|---|---|
| 3.0.0 – 3.1.0 | Dual (CommonJS + ESM) | Mar 19, 2024 |
| 0.0.1 – 2.1.2 | CommonJS | Mar 28, 2017 |

## Frequently asked

**Is minizlib ESM-only?**

minizlib@3.1.0 ships CommonJS and ESM builds. minizlib publishes both a CommonJS entry and a native ESM entry (ESM added in 3.0.0). require("minizlib") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 18. import "minizlib" works alongside it.

**Can I require minizlib?**

Yes. minizlib ships a CommonJS entry alongside the native ESM entry. require("minizlib") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 18.

**Does minizlib work in Bun?**

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

**Does minizlib ship TypeScript types?**

Yes. minizlib bundles its own type declarations; no @types package is needed.

## Links

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

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