[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.