Optimize the typewriterMode code logic about the game

client/src/state/progress.ts

@@ -27,7 +27,7 @@ export interface GameProgressState {
   difficulty: number,
   openedIntro: boolean,
   data: WorldProgressState,
-  typewriterMode: boolean
+  typewriterMode?: boolean
 }
 
 /**
@@ -54,7 +54,7 @@ const initalLevelProgressState: LevelProgressState = {code: "", completed: false
 /** Add an empty skeleton with progress for the current game */
 function addGameProgress (state: ProgressState, action: PayloadAction<{game: string}>) {
   if (!state.games[action.payload.game]) {
-    state.games[action.payload.game] = {inventory: [], openedIntro: true, data: {}, difficulty: DEFAULT_DIFFICULTY, typewriterMode: true}
+    state.games[action.payload.game] = {inventory: [], openedIntro: true, data: {}, difficulty: DEFAULT_DIFFICULTY}
   }
   if (!state.games[action.payload.game].data) {
     state.games[action.payload.game].data = {}
@@ -100,7 +100,7 @@ export const progressSlice = createSlice({
     },
     /** delete all progress for this game */
     deleteProgress(state: ProgressState, action: PayloadAction<{game: string}>) {
-      state.games[action.payload.game] = {inventory: [], data: {}, openedIntro: true, difficulty: DEFAULT_DIFFICULTY, typewriterMode: true}
+      state.games[action.payload.game] = {inventory: [], data: {}, openedIntro: true, difficulty: DEFAULT_DIFFICULTY}
     },
     /** delete progress for this level */
     deleteLevelProgress(state: ProgressState, action: PayloadAction<{game: string, world: string, level: number}>) {
@@ -127,6 +127,7 @@ export const progressSlice = createSlice({
       addGameProgress(state, action)
       state.games[action.payload.game].openedIntro = action.payload.openedIntro
     },
+    /** set the typewriter mode */
     changeTypewriterMode(state: ProgressState, action: PayloadAction<{game: string, typewriterMode: boolean}>) {
       addGameProgress(state, action)
       state.games[action.payload.game].typewriterMode = action.payload.typewriterMode
@@ -201,10 +202,10 @@ export function selectOpenedIntro(game: string) {
   }
 }
 
-/** return whether the intro has been read */
+/** return typewriter mode for the current game if it exists */
 export function selectTypewriterMode(game: string) {
   return (state) => {
-    return state.progress.games[game] ? state.progress.games[game].typewriterMode : true
+    return state.progress.games[game]?.typewriterMode ?? true
   }
 }