# Is @hookform/resolvers ESM-only? Can you require() it?

> @hookform/resolvers@5.9.1 ships CommonJS and ESM builds. Dual package — require() works on every Node.js version we test; import works too.

React Hook Form validation resolvers: Yup, Joi, Superstruct, Zod, Vest, Class Validator, io-ts, Nope, computed-types, TypeBox, arktype, Typanion, Effect-TS and VineJS

Last verified Sep 9, 2026 against @hookform/resolvers@5.9.1.

@hookform/resolvers publishes both a CommonJS entry and a native ESM entry (ESM added in 1.3.6). require("@hookform/resolvers") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "@hookform/resolvers" works alongside it.

## What to do

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

## Facts

- Latest: 5.9.1 (Aug 17, 2026)
- Module format: Dual (CommonJS + ESM)
- Last CommonJS version: 5.9.1
- Native ESM since: 1.3.6
- TypeScript types: bundled
- Node engines: not declared
- Weekly downloads: 39.9M
- License: MIT

## Runtime test results for @hookform/resolvers@5.9.1

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

| Runtime | require("@hookform/resolvers") | import "@hookform/resolvers" |
|---|---|---|
| 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 @hookform/resolvers

ES modules:

```js
import * as resolvers from "@hookform/resolvers";
```

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

CommonJS:

```js
const resolvers = require("@hookform/resolvers");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (112 versions; the newest 60 shown).

| Versions | Format | First published |
|---|---|---|
| 2.9.3 – 5.9.1 | Dual (CommonJS + ESM) | Jun 24, 2022 |

## Frequently asked

**Is @hookform/resolvers ESM-only?**

@hookform/resolvers@5.9.1 ships CommonJS and ESM builds. @hookform/resolvers publishes both a CommonJS entry and a native ESM entry (ESM added in 1.3.6). require("@hookform/resolvers") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "@hookform/resolvers" works alongside it.

**Can I require @hookform/resolvers?**

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

**Does @hookform/resolvers work in Bun?**

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

**Does @hookform/resolvers ship TypeScript types?**

Yes. @hookform/resolvers bundles its own type declarations; no @types package is needed.

## Links

- [@hookform/resolvers on npm](https://www.npmjs.com/package/@hookform/resolvers)
- [Source repository](https://github.com/react-hook-form/resolvers)
- [HTML version](https://canirequire.com/package/@hookform/resolvers/)
- [JSON version](https://canirequire.com/package/@hookform/resolvers.json)

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