# Functions

<a id="on"></a>

##  on

▸ **on**(self: *`MockState`*, type: *`ProviderInterface$Emitted`*, sub: *`ProviderInterface$EmitCb`*): `void`

*Defined in [mock/on.ts:8](https://github.com/polkadot-js/api/blob/2b88a8f/packages/rpc-provider/src/mock/on.ts#L8)*

**Parameters:**

| Param | Type |
| ------ | ------ |
| self | `MockState` |
| type | `ProviderInterface$Emitted` |
| sub | `ProviderInterface$EmitCb` |

**Returns:** `void`

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