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

> markdown-it-container@4.0.0 ships CommonJS and ESM builds. Dual package — require() works on every Node.js version we test; import works too.

Plugin to create block-level custom containers for markdown-it markdown parser

Last verified Sep 9, 2026 against markdown-it-container@4.0.0.

markdown-it-container publishes both a CommonJS entry and a native ESM entry (ESM added in 4.0.0). require("markdown-it-container") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "markdown-it-container" works alongside it.

## What to do

1. Nothing to change. require("markdown-it-container") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import * as markdownItContainer from "markdown-it-container" works alongside it; use named imports for what the ESM entry exports.
2. TypeScript: npm install -D @types/markdown-it-container

## Facts

- Latest: 4.0.0 (Dec 5, 2023)
- Module format: Dual (CommonJS + ESM)
- Last CommonJS version: 4.0.0
- Native ESM since: 4.0.0
- TypeScript types: @types/markdown-it-container
- Node engines: not declared
- Weekly downloads: 395K
- License: MIT

## Runtime test results for markdown-it-container@4.0.0

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

| Runtime | require("markdown-it-container") | import "markdown-it-container" |
|---|---|---|
| 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 markdown-it-container

ES modules:

```js
import * as markdownItContainer from "markdown-it-container";
```

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

CommonJS:

```js
const markdownItContainer = require("markdown-it-container");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (4 versions; the newest 4 shown).

| Versions | Format | First published |
|---|---|---|
| 4.0.0 | Dual (CommonJS + ESM) | Dec 5, 2023 |
| 1.0.0 – 3.0.0 | CommonJS | Mar 13, 2015 |

## Frequently asked

**Is markdown-it-container ESM-only?**

markdown-it-container@4.0.0 ships CommonJS and ESM builds. markdown-it-container publishes both a CommonJS entry and a native ESM entry (ESM added in 4.0.0). require("markdown-it-container") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "markdown-it-container" works alongside it.

**Can I require markdown-it-container?**

Yes. markdown-it-container ships a CommonJS entry alongside the native ESM entry. require("markdown-it-container") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.

**Does markdown-it-container work in Bun?**

Yes. import "markdown-it-container" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does markdown-it-container ship TypeScript types?**

Not bundled. Install the community types with "npm install -D @types/markdown-it-container".

## Links

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

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