# Type aliases

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##  HeaderAndValidators

**Ƭ HeaderAndValidators**: *[`Header`, `Array`<`AccountId`>]*

*Defined in [chain/subscribeNewHead.ts:13](https://github.com/polkadot-js/api/blob/9373e5d/packages/api-derive/src/chain/subscribeNewHead.ts#L13)*

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# Functions

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##  subscribeNewHead

▸ **subscribeNewHead**(api: *`ApiInterface$Rx`*): `(Anonymous function)`

*Defined in [chain/subscribeNewHead.ts:18](https://github.com/polkadot-js/api/blob/9373e5d/packages/api-derive/src/chain/subscribeNewHead.ts#L18)*

Subscribe to block headers and extend it with the author

**Parameters:**

| Name | Type |
| ------ | ------ |
| api | `ApiInterface$Rx` |

**Returns:** `(Anonymous function)`

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