# Functions

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

##  on

▸ **on**(self: *[MockState](_mock_types_d_.md#mockstate)*, type: *[ProviderInterface$Emitted](_types_d_.md#providerinterface_emitted)*, sub: *[ProviderInterface$EmitCb](_types_d_.md#providerinterface_emitcb)*): `void`

*Defined in [mock/on.ts:8](https://github.com/polkadot-js/api/blob/e9030fa/packages/api-provider/src/mock/on.ts#L8)*

**Parameters:**

| Param | Type |
| ------ | ------ |
| self | [MockState](_mock_types_d_.md#mockstate) |
| type | [ProviderInterface$Emitted](_types_d_.md#providerinterface_emitted) |
| sub | [ProviderInterface$EmitCb](_types_d_.md#providerinterface_emitcb) |

**Returns:** `void`

___