Improve Redux types part 4 (#26003)

* Fix return type of addUsersToChannel

* Fix type of TeamInviteWithError.error

* Change Constants.Integrations.PAGE_SIZE into a number"

webapp/platform/client/src/client4.ts

@@ -1535,7 +1535,7 @@ export default class Client4 {
     sendEmailGuestInvitesToChannelsGracefully = async (teamId: string, channelIds: string[], emails: string[], message: string) => {
         this.trackEvent('api', 'api_teams_invite_guests', {team_id: teamId, channel_ids: channelIds});
 
-        return this.doFetch<TeamInviteWithError>(
+        return this.doFetch<TeamInviteWithError[]>(
             `${this.getTeamRoute(teamId)}/invite-guests/email?graceful=true`,
             {method: 'post', body: JSON.stringify({emails, channels: channelIds, message})},
         );

webapp/platform/types/src/teams.ts

@@ -109,5 +109,10 @@ export type NotPagedTeamSearchOpts = {
 
 export type TeamInviteWithError = {
     email: string;
-    error: ServerError;
+
+    // Unlike ServerError, error uses field names directly from model.AppError on the server
+    error: {
+        id: string;
+        message: string;
+    };
 };