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# Events
!!! info "Design Document"
This is a design document, explaining the design and vision for a HedgeDoc 2
feature. It is not a user guide and may or may not be fully implemented.
In HedgeDoc 2, we use an event system based on [EventEmitter2][eventemitter2].
It's used to reduce circular dependencies between different services and inform these services
about changes.
HedgeDoc's system is basically [the system NestJS offers][nestjs/eventemitter].
The config for the `EventEmitterModule` is stored in `events.ts` and
exported as `eventModuleConfig`. In the same file enums for the event keys are defined.
Each of these events is expected to be sent with an additional value.
In the enum definition a comment should tell you what exactly this value should be.
[eventemitter2]: https://github.com/EventEmitter2/EventEmitter2
[nestjs/eventemitter]: https://docs.nestjs.com/techniques/events