diff --git a/app/src/components/QuestPart.vue b/app/src/components/QuestPart.vue
index 17020b3..f4cae70 100644
--- a/app/src/components/QuestPart.vue
+++ b/app/src/components/QuestPart.vue
@@ -3,8 +3,14 @@ import { computed } from 'vue'
 import MarkdownText from './MarkdownText.vue'
 import sessionStore from '../store/session'
 
+interface Task {
+  id: number
+  name: string
+  completed: boolean
+}
+
 const tasks = computed(() => {
-  return sessionStore.session.tasks.map((task: any) => {
+  return sessionStore.session.tasks.map((task: Task) => {
     const prefix = task.completed ? '✓' : '➤'
     const color = task.completed ? 'text-text-primary' : 'text-text'
     return {
diff --git a/app/src/components/VisualizationPart.vue b/app/src/components/VisualizationPart.vue
index bbbafe4..aa5fea6 100644
--- a/app/src/components/VisualizationPart.vue
+++ b/app/src/components/VisualizationPart.vue
@@ -5,7 +5,7 @@ import TreeChart from './TreeChart.vue'
 const treeRef = ref<HTMLElement | null>(null)
 let pos = { top: 0, left: 0, x: 0, y: 0 }
 
-function mouseMoveHandler(e: any) {
+function mouseMoveHandler(e: MouseEvent) {
   const dx = e.clientX - pos.x
   const dy = e.clientY - pos.y
 
@@ -23,7 +23,7 @@ function mouseUpHandler() {
   document.removeEventListener('mouseup', mouseUpHandler)
 }
 
-function mouseDownHandler(e: any) {
+function mouseDownHandler(e: MouseEvent) {
   if (treeRef.value === null) return
   treeRef.value.style.cursor = 'grabbing'
   treeRef.value.style.userSelect = 'none'
diff --git a/app/src/store/session.ts b/app/src/store/session.ts
index a0a01b7..395a5d3 100644
--- a/app/src/store/session.ts
+++ b/app/src/store/session.ts
@@ -24,7 +24,21 @@ function newSession() {
   }
 }
 
-const store: any = reactive({
+interface Session {
+  status: string
+  graph: FileGraph
+  pwd: string
+  hints: string[]
+  tasks: string[]
+}
+
+interface Store {
+  session: Session
+  questId: string
+  quest: any // 这里需要根据实际情况定义 quest 属性的类型
+}
+
+const store: Store = reactive({
   session: newSession(),
   questId: '',
   quest: null,
@@ -40,7 +54,7 @@ function setQuest(questId: string) {
   })
 }
 
-async function setSession(session: any) {
+async function setSession(session: Session) {
   try {
     console.log('Setting session...', session)
     store.session = session
@@ -50,7 +64,11 @@ async function setSession(session: any) {
     term.focus()
   } catch (err: any) {
     console.error(err)
-    toast.error(err.message)
+    if (err instanceof Error) {
+      toast.error(err.message)
+    } else {
+      toast.error('Failed to connect to the session. Please try again later.')
+    }
     throw err
   }
 }
@@ -67,7 +85,7 @@ export async function createSession() {
   }
 }
 
-async function getActiveSession(questId: any) {
+async function getActiveSession(questId: string) {
   try {
     const res = await api.post('/sessions/active', { questId })
     await setSession(res.data)
@@ -128,10 +146,10 @@ export async function init(questId: string) {
 }
 
 function setup() {
-  socket.on('terminal', (data: any) => {
+  socket.on('terminal', (data: string) => {
     term.write(data)
   })
-  term.onData((data: any) => {
+  term.onData((data: string) => {
     socket.emit('terminal', data)
   })
   socket.on('graph', (event: { discover: FileObject[]; pwd: string }) => {
diff --git a/app/src/utils/errors.ts b/app/src/utils/errors.ts
index 0f94185..2c78434 100644
--- a/app/src/utils/errors.ts
+++ b/app/src/utils/errors.ts
@@ -1,28 +1,28 @@
 /* eslint-disable max-classes-per-file */
 export class TooManyRequestsError extends Error {
-  constructor(message: string | undefined) {
+  constructor(message: string) {
     super(message)
     this.name = 'TooManyRequestsError'
   }
 }
 
 export class ValidationError extends Error {
-  constructor(message: string | undefined) {
+  constructor(message: string) {
     super(message)
     this.name = 'ValidationError'
   }
 }
 
 export class UnauthorizedError extends Error {
-  constructor(message: string | undefined) {
+  constructor(message: string) {
     super(message)
     this.name = 'UnauthorizedError'
   }
 }
 
 export class LoadQuestError extends Error {
-  questId: any
-  constructor(message: string | undefined, questId: any) {
+  questId: string
+  constructor(message: string, questId: string) {
     super(message)
     this.name = 'LoadQuestError'
     this.questId = questId
@@ -30,8 +30,8 @@ export class LoadQuestError extends Error {
 }
 
 export class LoadSessionError extends Error {
-  questId: any
-  constructor(message: string | undefined, questId: any) {
+  questId: string
+  constructor(message: string, questId: string) {
     super(message)
     this.name = 'LoadSessionError'
     this.questId = questId
diff --git a/app/src/views/ChooseUsernamePage.vue b/app/src/views/ChooseUsernamePage.vue
index ff54dea..d344183 100644
--- a/app/src/views/ChooseUsernamePage.vue
+++ b/app/src/views/ChooseUsernamePage.vue
@@ -5,7 +5,14 @@ import Background from '../components/DynamicBackground.vue'
 import { TooManyRequestsError, ValidationError } from '../utils/errors'
 import { checkUsername, chooseUsername } from '../utils/auth'
 
-async function check({ username, error }: { username: string; error: any }) {
+async function check({
+  username,
+  error,
+}: {
+  username: string
+  // eslint-disable-next-line no-unused-vars
+  error: (msg: string) => void
+}) {
   if (username) {
     if (!isValidUsername(username)) {
       error('無效的帳號名稱')