api/event: Describe stream events.

Author: gnprice

src/actionTypes.js

@@ -66,8 +66,7 @@ import {
   EVENT,
 } from './actionConstants';
 
-import { EventTypes } from './api/eventTypes';
-import type { MessageEvent, PresenceEvent } from './api/eventTypes';
+import type { MessageEvent, PresenceEvent, StreamEvent } from './api/eventTypes';
 
 import type {
   Dimensions,
@@ -304,40 +303,9 @@ type EventSubscriptionPeerRemoveAction = {|
   user_id: number,
 |};
 
-type EventStreamCreate = {|
-  ...ServerEvent,
-  type: typeof EventTypes.stream,
-  op: 'create',
-  streams: Stream[],
-|};
-
-type EventStreamDelete = {|
-  ...ServerEvent,
-  type: typeof EventTypes.stream,
-  op: 'delete',
-  streams: Stream[],
-|};
-
-type EventStreamUpdate = {|
-  ...ServerEvent,
-  type: typeof EventTypes.stream,
-  op: 'update',
-  stream_id: number,
-  name: string,
-  property: string,
-  value: string,
-|};
-
-type EventStreamOccupy = {|
-  ...ServerEvent,
-  type: typeof EventTypes.stream,
-  op: 'occupy',
-  streams: Stream[],
-|};
-
 type GenericEventAction = {|
   type: typeof EVENT,
-  event: EventStreamCreate | EventStreamDelete | EventStreamUpdate | EventStreamOccupy,
+  event: StreamEvent,
 |};
 
 type EventNewMessageAction = {|

src/api/eventTypes.js

@@ -10,7 +10,7 @@
  * @flow strict-local
  */
 
-import type { Message } from './apiTypes';
+import type { Message, Stream } from './apiTypes';
 
 //
 // First, types used inside events.
@@ -110,6 +110,27 @@ export type PresenceEvent = {|
   presence: UserPresence,
 |};
 
+type StreamListEvent = {|
+  ...EventCommon,
+  type: typeof EventTypes.stream,
+  streams: Stream[],
+|};
+
+// prettier-ignore
+export type StreamEvent =
+  | {| ...StreamListEvent, op: 'create', |}
+  | {| ...StreamListEvent, op: 'delete', |}
+  | {| ...StreamListEvent, op: 'occupy', |}
+  | {|
+      ...EventCommon,
+      type: typeof EventTypes.stream,
+      op: 'update',
+      stream_id: number,
+      name: string,
+      property: string,
+      value: string,
+    |};
+
 export type UpdateMessageFlagsEvent = {|
   ...EventCommon,
   type: typeof EventTypes.update_message_flags,