# Is @sinclair/typebox ESM-only? Can you require() it?

> @sinclair/typebox@0.34.52 ships CommonJS and ESM builds. Dual package — require() works on every Node.js version we test; import works too.

Json Schema Type Builder with Static Type Resolution for TypeScript

Last verified Sep 9, 2026 against @sinclair/typebox@0.34.52.

@sinclair/typebox publishes both a CommonJS entry and a native ESM entry (ESM added in 0.32.0). require("@sinclair/typebox") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "@sinclair/typebox" works alongside it.

## What to do

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

## Facts

- Latest: 0.34.52 (Jul 11, 2026)
- Module format: Dual (CommonJS + ESM)
- Last CommonJS version: 0.34.52
- Native ESM since: 0.32.0
- TypeScript types: bundled
- Node engines: not declared
- Weekly downloads: 81.7M
- License: MIT

## Runtime test results for @sinclair/typebox@0.34.52

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

| Runtime | require("@sinclair/typebox") | import "@sinclair/typebox" |
|---|---|---|
| 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 @sinclair/typebox

ES modules:

```js
import * as typebox from "@sinclair/typebox";
```

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

CommonJS:

```js
const typebox = require("@sinclair/typebox");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (363 versions; the newest 60 shown).

| Versions | Format | First published |
|---|---|---|
| 0.33.18 – 0.34.52 | Dual (CommonJS + ESM) | Nov 6, 2024 |

## Frequently asked

**Is @sinclair/typebox ESM-only?**

@sinclair/typebox@0.34.52 ships CommonJS and ESM builds. @sinclair/typebox publishes both a CommonJS entry and a native ESM entry (ESM added in 0.32.0). require("@sinclair/typebox") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "@sinclair/typebox" works alongside it.

**Can I require @sinclair/typebox?**

Yes. @sinclair/typebox ships a CommonJS entry alongside the native ESM entry. require("@sinclair/typebox") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.

**Does @sinclair/typebox work in Bun?**

Yes. import "@sinclair/typebox" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does @sinclair/typebox ship TypeScript types?**

Yes. @sinclair/typebox bundles its own type declarations; no @types package is needed.

## Links

- [@sinclair/typebox on npm](https://www.npmjs.com/package/@sinclair/typebox)
- [Source repository](https://github.com/sinclairzx81/sinclair-typebox)
- [HTML version](https://canirequire.com/package/@sinclair/typebox/)
- [JSON version](https://canirequire.com/package/@sinclair/typebox.json)

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