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docs: add documentation about events

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Signed-off-by: Philip Molares <philip.molares@udo.edu>
Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>
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Philip Molares 2022-09-24 18:52:02 +02:00 • committed by David Mehren
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In HedgeDoc 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 defintion 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