[Home](./index.md) > [@empathyco/x-components](./x-components.md) > [XBus](./x-components.xbus.md) ## XBus interface Event bus to emit and subscribe to events. **Signature:** ```typescript export interface XBus ``` ## Properties | Property | Modifiers | Type | Description | | --- | --- | --- | --- | | [emit](./x-components.xbus.emit.md) | | (<SomeEvent extends keyof SomeEvents>(event: SomeEvent) => Promise<[EmittedData](./x-components.emitteddata.md)<SomeEvents, SomeEvent, SomeEventMetadata>>) \| (<SomeEvent extends keyof SomeEvents>(event: SomeEvent, payload: [EventPayload](./x-components.eventpayload.md)<SomeEvents, SomeEvent>, metadata?: SomeEventMetadata) => Promise<[EmittedData](./x-components.emitteddata.md)<SomeEvents, SomeEvent, SomeEventMetadata>>) | Emits an event with the void type associated as payload. | | [on](./x-components.xbus.on.md) | | <SomeEvent extends keyof SomeEvents>(event: SomeEvent, withMetadata?: boolean) => typeof withMetadata extends true ? Observable<[SubjectPayload](./x-components.subjectpayload.md)<[EventPayload](./x-components.eventpayload.md)<SomeEvents, SomeEvent>, SomeEventMetadata>> : Observable<[EventPayload](./x-components.eventpayload.md)<SomeEvents, SomeEvent>> | Retrieves an observable for an event. |