[O3 Framework](../API.md) / Validator

# Type Alias: Validator()

> **Validator** = (`value`) => `void` \| `string`

Defined in: [packages/framework/esm-config/src/types.ts:69](https://github.com/openmrs/openmrs-esm-core/blob/main/packages/framework/esm-config/src/types.ts#L69)

## Parameters

### value

`any`

## Returns

`void` \| `string`