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

# Type Alias: Key

> **Key** = `string` \| [`ArgumentsTuple`](ArgumentsTuple.md) \| `undefined` \| `null`

Defined in: [packages/framework/esm-react-utils/src/useOpenmrsSWR.ts:9](https://github.com/openmrs/openmrs-esm-core/blob/main/packages/framework/esm-react-utils/src/useOpenmrsSWR.ts#L9)