refactor: more TS code

src/app/slices/channels.ts

@@ -9,7 +9,7 @@ interface StoredChannel extends Channel {
 
 interface State {
   ids: number[];
-  byId: { [id: number]: StoredChannel | undefined };
+  byId: { [id: number]: StoredChannel };
 }
 
 const initialState: State = {

src/app/slices/footprint.ts

@@ -6,8 +6,8 @@ export interface State {
   afterMid: number;
   readUsers: { [uid: number]: number };
   readChannels: { [gid: number]: number };
-  muteUsers: { [uid: number]: { expired_in: number } | undefined };
-  muteChannels: { [gid: number]: { expired_in: number } | undefined };
+  muteUsers: { [uid: number]: { expired_in?: number } | undefined };
+  muteChannels: { [gid: number]: { expired_in?: number } | undefined };
 }
 
 const initialState: State = {

src/app/slices/ui.ts

@@ -16,7 +16,7 @@ export interface State {
       type: string;
     }[];
   };
-  selectMessages: { [key: string]: any };
+  selectMessages: { [key: string]: number[] };
   draftMarkdown: { [key: string]: any };
   draftMixedText: { [key: string]: any };
   rememberedNavs: {

src/app/slices/users.ts

@@ -11,7 +11,7 @@ export interface StoredUser extends User {
 
 export interface State {
   ids: number[];
-  byId: { [id: number]: StoredUser | undefined };
+  byId: { [id: number]: StoredUser };
 }
 
 const initialState: State = {