diff --git a/eslint.config.cjs b/eslint.config.cjs
index 76bb9e1..38f99f6 100644
--- a/eslint.config.cjs
+++ b/eslint.config.cjs
@@ -12,7 +12,7 @@ module.exports = [
   ...tseslint.config(eslint.configs.recommended, ...tseslint.configs.recommended),
   {
     rules: {
-      'no-unused-vars': ['warn', { argsIgnorePattern: '^_', varsIgnorePattern: '^_' }],
+      'no-unused-vars': ['off'],
       '@typescript-eslint/no-unused-vars': [
         'warn',
         { argsIgnorePattern: '^_', varsIgnorePattern: '^_' },
diff --git a/src/App.vue b/src/App.vue
index b0ec20e..072517c 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -3,13 +3,15 @@
     <!-- Left sidebar -->
     <NcAppNavigation>
       <template #search>
-        <NcAppNavigationSearch v-model="searchValue" :label="strings.searchLabel"
-          :placeholder="strings.searchPlaceholder" />
+        <NcAppNavigationSearch
+          v-model="searchValue"
+          :label="strings.searchLabel"
+          :placeholder="strings.searchPlaceholder"
+        />
       </template>
 
       <template #list>
-        <NcAppNavigationItem :name="strings.navHome" :to="{ path: '/' }"
-          :open="true">
+        <NcAppNavigationItem :name="strings.navHome" :to="{ path: '/' }" :open="true">
           <template #icon>
             <HomeIcon :size="20" />
           </template>
@@ -20,7 +22,8 @@
             :key="`header-${header.id}`"
             :name="header.name"
             :open="isHeaderOpen(header.id)"
-            @click.native.prevent="toggleHeader(header.id)">
+            @click.native.prevent="toggleHeader(header.id)"
+          >
             <template #icon>
               <FolderIcon :size="20" />
             </template>
@@ -30,7 +33,8 @@
               v-for="category in header.categories"
               :key="`category-${category.id}`"
               :name="category.name"
-              :to="{ path: `/c/${category.slug}` }">
+              :to="{ path: `/c/${category.slug}` }"
+            >
               <template #icon>
                 <ForumIcon :size="20" />
               </template>
@@ -63,7 +67,8 @@
   </NcContent>
 </template>
 
-<script>
+<script lang="ts">
+import { defineComponent } from 'vue'
 import { t } from '@nextcloud/l10n'
 import NcContent from '@nextcloud/vue/components/NcContent'
 import NcAppContent from '@nextcloud/vue/components/NcAppContent'
@@ -76,9 +81,9 @@ import ForumIcon from '@icons/Forum.vue'
 import FolderIcon from '@icons/Folder.vue'
 import PuzzleIcon from '@icons/Puzzle.vue'
 import InfoIcon from '@icons/Information.vue'
-import { useCategories } from '@/composables/useCategories.js'
+import { useCategories } from '@/composables/useCategories'
 
-export default {
+export default defineComponent({
   name: 'AppUserWrapper',
   components: {
     NcContent,
@@ -108,7 +113,7 @@ export default {
     return {
       searchValue: '',
       isRouterLoading: false,
-      openHeaders: {}, // Track which headers are open
+      openHeaders: {} as Record<number, boolean>, // Track which headers are open
       // Mount path for this app section; adjust to your mount.
       basePath: '/apps/forum',
       strings: {
@@ -126,8 +131,8 @@ export default {
         navExamples: t('forum', 'Examples'),
         navAbout: t('forum', 'About'),
       },
-      _removeBeforeEach: null,
-      _removeAfterEach: null,
+      _removeBeforeEach: null as (() => void) | null,
+      _removeAfterEach: null as (() => void) | null,
     }
   },
   async created() {
@@ -136,7 +141,7 @@ export default {
       await this.fetchCategories()
 
       // Initialize all headers as open by default
-      const openState = {}
+      const openState: Record<number, boolean> = {}
       this.categoryHeaders.forEach((header) => {
         openState[header.id] = true
       })
@@ -160,23 +165,23 @@ export default {
     if (typeof this._removeAfterEach === 'function') this._removeAfterEach()
   },
   methods: {
-    isPrefixRoute(prefix) {
+    isPrefixRoute(prefix: string): boolean {
       return this.$route.path.startsWith(prefix)
     },
 
-    toggleHeader(headerId) {
+    toggleHeader(headerId: number): void {
       // Vue 3 doesn't need $set - direct assignment works with reactivity
       this.openHeaders = {
         ...this.openHeaders,
-        [headerId]: !this.openHeaders[headerId]
+        [headerId]: !this.openHeaders[headerId],
       }
     },
 
-    isHeaderOpen(headerId) {
+    isHeaderOpen(headerId: number): boolean {
       return this.openHeaders[headerId] !== false
     },
   },
-}
+})
 </script>
 
 <style scoped lang="scss">
diff --git a/src/components/CategoryCard.vue b/src/components/CategoryCard.vue
index 5bde064..4b093c1 100644
--- a/src/components/CategoryCard.vue
+++ b/src/components/CategoryCard.vue
@@ -19,14 +19,16 @@
   </div>
 </template>
 
-<script>
+<script lang="ts">
+import { defineComponent, type PropType } from 'vue'
 import { t } from '@nextcloud/l10n'
+import type { Category } from '@/types'
 
-export default {
+export default defineComponent({
   name: 'CategoryCard',
   props: {
     category: {
-      type: Object,
+      type: Object as PropType<Category>,
       required: true,
     },
   },
@@ -39,7 +41,7 @@ export default {
       },
     }
   },
-}
+})
 </script>
 
 <style scoped lang="scss">
diff --git a/src/components/PostCard.vue b/src/components/PostCard.vue
index 0eb8e12..dbed8b9 100644
--- a/src/components/PostCard.vue
+++ b/src/components/PostCard.vue
@@ -47,7 +47,8 @@
   </div>
 </template>
 
-<script>
+<script lang="ts">
+import { defineComponent, type PropType } from 'vue'
 import NcAvatar from '@nextcloud/vue/components/NcAvatar'
 import NcDateTime from '@nextcloud/vue/components/NcDateTime'
 import NcActions from '@nextcloud/vue/components/NcActions'
@@ -57,8 +58,9 @@ import PencilIcon from '@icons/Pencil.vue'
 import DeleteIcon from '@icons/Delete.vue'
 import { t } from '@nextcloud/l10n'
 import { getCurrentUser } from '@nextcloud/auth'
+import type { Post } from '@/types'
 
-export default {
+export default defineComponent({
   name: 'PostCard',
   components: {
     NcAvatar,
@@ -71,7 +73,7 @@ export default {
   },
   props: {
     post: {
-      type: Object,
+      type: Object as PropType<Post>,
       required: true,
     },
     isFirstPost: {
@@ -94,22 +96,21 @@ export default {
     currentUser() {
       return getCurrentUser()
     },
-    canEdit() {
-      return this.currentUser && this.currentUser.uid === this.post.authorId
+    canEdit(): boolean {
+      return this.currentUser !== null && this.currentUser.uid === this.post.authorId
     },
-    canDelete() {
+    canDelete(): boolean {
       // For now, only author can delete. Later add admin/moderator check
-      return this.currentUser && this.currentUser.uid === this.post.authorId
+      return this.currentUser !== null && this.currentUser.uid === this.post.authorId
     },
-    formattedContent() {
+    formattedContent(): string {
       // Content is already parsed by BBCodeService on the backend
       // BBCodeService handles HTML escaping before parsing BBCodes
       return this.post.content
     },
   },
-  methods: {
-  },
-}
+  methods: {},
+})
 </script>
 
 <style scoped lang="scss">
diff --git a/src/components/ThreadCard.vue b/src/components/ThreadCard.vue
index 048c694..6f52254 100644
--- a/src/components/ThreadCard.vue
+++ b/src/components/ThreadCard.vue
@@ -47,15 +47,17 @@
   </div>
 </template>
 
-<script>
+<script lang="ts">
+import { defineComponent, type PropType } from 'vue'
 import NcDateTime from '@nextcloud/vue/components/NcDateTime'
 import PinIcon from '@icons/Pin.vue'
 import LockIcon from '@icons/Lock.vue'
 import CommentIcon from '@icons/Comment.vue'
 import EyeIcon from '@icons/Eye.vue'
 import { t } from '@nextcloud/l10n'
+import type { Thread } from '@/types'
 
-export default {
+export default defineComponent({
   name: 'ThreadCard',
   components: {
     NcDateTime,
@@ -66,7 +68,7 @@ export default {
   },
   props: {
     thread: {
-      type: Object,
+      type: Object as PropType<Thread>,
       required: true,
     },
   },
@@ -81,7 +83,7 @@ export default {
       },
     }
   },
-}
+})
 </script>
 
 <style scoped lang="scss">
diff --git a/src/composables/useCategories.js b/src/composables/useCategories.js
deleted file mode 100644
index 9ed2908..0000000
--- a/src/composables/useCategories.js
+++ /dev/null
@@ -1,92 +0,0 @@
-import { ref, computed } from 'vue'
-import { ocs } from '@/axios'
-
-// Shared state - will persist across components
-// The API returns an array of headers, each with a nested 'categories' array
-const categoryHeaders = ref([])
-const loading = ref(false)
-const error = ref(null)
-const loaded = ref(false)
-
-/**
- * Composable for managing categories
- * Provides shared state across components to avoid redundant API calls
- */
-export function useCategories() {
-	/**
-	 * Fetch categories from the API
-	 * Uses cached data if already loaded
-	 */
-	const fetchCategories = async (force = false) => {
-		// Return cached data if already loaded and not forcing refresh
-		if (loaded.value && !force) {
-			return categoryHeaders.value
-		}
-
-		try {
-			loading.value = true
-			error.value = null
-
-			const response = await ocs.get('/categories')
-			categoryHeaders.value = response.data || []
-			loaded.value = true
-
-			return categoryHeaders.value
-		} catch (e) {
-			console.error('Failed to fetch categories:', e)
-			error.value = e.message || 'Failed to load categories'
-			throw e
-		} finally {
-			loading.value = false
-		}
-	}
-
-	/**
-	 * Get all categories as a flat list (extracted from all headers)
-	 * Useful for sidebar navigation
-	 */
-	const categoriesList = computed(() => {
-		const allCategories = []
-
-		categoryHeaders.value.forEach((header) => {
-			if (header.categories && Array.isArray(header.categories)) {
-				allCategories.push(...header.categories)
-			}
-		})
-
-		// Sort by sortOrder
-		return allCategories.sort((a, b) => a.sortOrder - b.sortOrder)
-	})
-
-	/**
-	 * Refresh categories from the API
-	 */
-	const refresh = () => {
-		return fetchCategories(true)
-	}
-
-	/**
-	 * Clear cached categories
-	 */
-	const clear = () => {
-		categoryHeaders.value = []
-		loaded.value = false
-		error.value = null
-	}
-
-	return {
-		// State
-		categoryHeaders,
-		loading,
-		error,
-		loaded,
-
-		// Computed
-		categoriesList,
-
-		// Methods
-		fetchCategories,
-		refresh,
-		clear,
-	}
-}
diff --git a/src/composables/useCategories.ts b/src/composables/useCategories.ts
new file mode 100644
index 0000000..8547a5a
--- /dev/null
+++ b/src/composables/useCategories.ts
@@ -0,0 +1,73 @@
+import { ref, type Ref } from 'vue'
+import { ocs } from '@/axios'
+import type { CategoryHeader } from '@/types'
+
+// Shared state - will persist across components
+// The API returns an array of headers, each with a nested 'categories' array
+const categoryHeaders = ref<CategoryHeader[]>([])
+const loading = ref<boolean>(false)
+const error = ref<string | null>(null)
+const loaded = ref<boolean>(false)
+
+/**
+ * Composable for managing categories
+ * Provides shared state across components to avoid redundant API calls
+ */
+export function useCategories() {
+  /**
+   * Fetch categories from the API
+   * Uses cached data if already loaded
+   */
+  const fetchCategories = async (force = false): Promise<CategoryHeader[]> => {
+    // Return cached data if already loaded and not forcing refresh
+    if (loaded.value && !force) {
+      return categoryHeaders.value
+    }
+
+    try {
+      loading.value = true
+      error.value = null
+
+      const response = await ocs.get<CategoryHeader[]>('/categories')
+      categoryHeaders.value = response.data || []
+      loaded.value = true
+
+      return categoryHeaders.value
+    } catch (e) {
+      console.error('Failed to fetch categories:', e)
+      error.value = (e as Error).message || 'Failed to load categories'
+      throw e
+    } finally {
+      loading.value = false
+    }
+  }
+
+  /**
+   * Refresh categories from the API
+   */
+  const refresh = (): Promise<CategoryHeader[]> => {
+    return fetchCategories(true)
+  }
+
+  /**
+   * Clear cached categories
+   */
+  const clear = (): void => {
+    categoryHeaders.value = []
+    loaded.value = false
+    error.value = null
+  }
+
+  return {
+    // State
+    categoryHeaders: categoryHeaders as Ref<CategoryHeader[]>,
+    loading: loading as Ref<boolean>,
+    error: error as Ref<string | null>,
+    loaded: loaded as Ref<boolean>,
+
+    // Methods
+    fetchCategories,
+    refresh,
+    clear,
+  }
+}
diff --git a/src/types/index.ts b/src/types/index.ts
new file mode 100644
index 0000000..9005805
--- /dev/null
+++ b/src/types/index.ts
@@ -0,0 +1,5 @@
+/**
+ * Central export for all TypeScript types
+ */
+
+export * from './models'
diff --git a/src/types/models.ts b/src/types/models.ts
new file mode 100644
index 0000000..47254e5
--- /dev/null
+++ b/src/types/models.ts
@@ -0,0 +1,125 @@
+/**
+ * Forum TypeScript Models
+ * These interfaces match the backend JSON responses
+ */
+
+export interface Category {
+  id: number
+  headerId: number
+  name: string
+  description: string | null
+  slug: string
+  sortOrder: number
+  threadCount: number
+  postCount: number
+  createdAt: number
+  updatedAt: number
+}
+
+export interface CategoryHeader {
+  id: number
+  name: string
+  sortOrder: number
+  createdAt: number
+  categories?: Category[]
+}
+
+export interface Thread {
+  id: number
+  categoryId: number
+  authorId: string
+  title: string
+  slug: string
+  viewCount: number
+  postCount: number
+  lastPostId: number | null
+  isLocked: boolean
+  isPinned: boolean
+  isHidden: boolean
+  createdAt: number
+  updatedAt: number
+  // Enriched fields (added by Thread::enrichThreadAuthor)
+  authorDisplayName?: string
+  authorIsDeleted?: boolean
+}
+
+export interface Post {
+  id: number
+  threadId: number
+  authorId: string
+  content: string
+  contentRaw: string
+  slug: string
+  isEdited: boolean
+  editedAt: number | null
+  createdAt: number
+  updatedAt: number
+  // Enriched fields (added by Post::enrichPostContent)
+  authorDisplayName?: string
+  authorIsDeleted?: boolean
+}
+
+export interface ForumUser {
+  id: number
+  userId: string
+  postCount: number
+  createdAt: number
+  updatedAt: number
+  deletedAt: number | null
+  isDeleted: boolean
+}
+
+export interface BBCode {
+  id: number
+  tag: string
+  replacement: string
+  description: string | null
+  enabled: boolean
+  parseInner: boolean
+  createdAt: number
+}
+
+export interface ReadMarker {
+  id: number
+  userId: string
+  threadId: number
+  lastReadPostId: number
+  readAt: number
+}
+
+export interface Role {
+  id: number
+  name: string
+  description: string | null
+  createdAt: number
+}
+
+export interface UserRole {
+  id: number
+  userId: string
+  roleId: number
+  createdAt: number
+}
+
+export interface Reaction {
+  id: number
+  postId: number
+  userId: string
+  reactionType: string
+  createdAt: number
+}
+
+export interface Attachment {
+  id: number
+  postId: number
+  fileid: number
+  filename: string
+  createdAt: number
+}
+
+export interface CatHeader {
+  id: number
+  name: string
+  sortOrder: number
+  createdAt: number
+}
diff --git a/src/views/CategoriesView.vue b/src/views/CategoriesView.vue
index 94611f9..c4693d1 100644
--- a/src/views/CategoriesView.vue
+++ b/src/views/CategoriesView.vue
@@ -18,8 +18,12 @@
     </div>
 
     <!-- Empty state -->
-    <NcEmptyContent v-else-if="categoryHeaders.length === 0" :title="strings.emptyTitle"
-      :description="strings.emptyDesc" class="mt-16" />
+    <NcEmptyContent
+      v-else-if="categoryHeaders.length === 0"
+      :title="strings.emptyTitle"
+      :description="strings.emptyDesc"
+      class="mt-16"
+    />
 
     <!-- Categories list -->
     <section v-else class="mt-16">
@@ -28,8 +32,12 @@
 
         <!-- Categories grid -->
         <div v-if="header.categories && header.categories.length > 0" class="categories-grid">
-          <CategoryCard v-for="category in header.categories" :key="category.id" :category="category"
-            @click="navigateToCategory(category)" />
+          <CategoryCard
+            v-for="category in header.categories"
+            :key="category.id"
+            :category="category"
+            @click="navigateToCategory(category)"
+          />
         </div>
 
         <!-- Empty state for header with no categories -->
@@ -39,16 +47,17 @@
   </div>
 </template>
 
-<script>
+<script lang="ts">
+import { defineComponent } from 'vue'
 import NcButton from '@nextcloud/vue/components/NcButton'
 import NcEmptyContent from '@nextcloud/vue/components/NcEmptyContent'
 import NcLoadingIcon from '@nextcloud/vue/components/NcLoadingIcon'
 import CategoryCard from '@/components/CategoryCard.vue'
-import { useCategories } from '@/composables/useCategories.js'
-
+import { useCategories } from '@/composables/useCategories'
+import type { Category } from '@/types'
 import { t } from '@nextcloud/l10n'
 
-export default {
+export default defineComponent({
   name: 'CategoriesView',
   components: {
     NcButton,
@@ -94,11 +103,11 @@ export default {
       }
     },
 
-    navigateToCategory(category) {
+    navigateToCategory(category: Category) {
       this.$router.push(`/c/${category.slug}`)
     },
   },
-}
+})
 </script>
 
 <style scoped lang="scss">
diff --git a/src/views/CategoryView.vue b/src/views/CategoryView.vue
index 168526a..fa7be77 100644
--- a/src/views/CategoryView.vue
+++ b/src/views/CategoryView.vue
@@ -3,12 +3,12 @@
     <!-- Toolbar -->
     <div class="toolbar">
       <div class="toolbar-left">
-        <NcButton type="tertiary" @click="goBack">{{ strings.back }}</NcButton>
+        <NcButton @click="goBack">{{ strings.back }}</NcButton>
       </div>
 
       <div class="toolbar-right">
         <NcButton @click="refresh" :disabled="loading">{{ strings.refresh }}</NcButton>
-        <NcButton type="primary" @click="createThread" :disabled="loading || category?.isLocked">
+        <NcButton @click="createThread" :disabled="loading">
           {{ strings.newThread }}
         </NcButton>
       </div>
@@ -46,7 +46,7 @@
       class="mt-16"
     >
       <template #action>
-        <NcButton type="primary" @click="createThread">{{ strings.newThread }}</NcButton>
+        <NcButton @click="createThread">{{ strings.newThread }}</NcButton>
       </template>
     </NcEmptyContent>
 
@@ -69,16 +69,17 @@
   </div>
 </template>
 
-<script>
+<script lang="ts">
+import { defineComponent } from 'vue'
 import NcButton from '@nextcloud/vue/components/NcButton'
 import NcEmptyContent from '@nextcloud/vue/components/NcEmptyContent'
 import NcLoadingIcon from '@nextcloud/vue/components/NcLoadingIcon'
 import ThreadCard from '@/components/ThreadCard.vue'
-
+import type { Category, Thread } from '@/types'
 import { ocs } from '@/axios'
 import { t, n } from '@nextcloud/l10n'
 
-export default {
+export default defineComponent({
   name: 'CategoryView',
   components: {
     NcButton,
@@ -89,9 +90,9 @@ export default {
   data() {
     return {
       loading: false,
-      category: null,
-      threads: [],
-      error: null,
+      category: null as Category | null,
+      threads: [] as Thread[],
+      error: null as string | null,
       limit: 50,
       offset: 0,
 
@@ -104,18 +105,19 @@ export default {
         emptyTitle: t('forum', 'No threads yet'),
         emptyDesc: t('forum', 'Be the first to start a discussion in this category.'),
         retry: t('forum', 'Retry'),
-        showingThreads: (count) => n('forum', 'Showing %n thread', 'Showing %n threads', count),
+        showingThreads: (count: number) =>
+          n('forum', 'Showing %n thread', 'Showing %n threads', count),
       },
     }
   },
   computed: {
-    categoryId() {
-      return this.$route.params.id ? parseInt(this.$route.params.id) : null
+    categoryId(): number | null {
+      return this.$route.params.id ? parseInt(this.$route.params.id as string) : null
     },
-    categorySlug() {
-      return this.$route.params.slug || null
+    categorySlug(): string | null {
+      return (this.$route.params.slug as string) || null
     },
-    sortedThreads() {
+    sortedThreads(): Thread[] {
       // Sort pinned threads first, then by updatedAt descending
       return [...this.threads].sort((a, b) => {
         if (a.isPinned !== b.isPinned) {
@@ -143,7 +145,7 @@ export default {
         }
       } catch (e) {
         console.error('Failed to refresh', e)
-        this.error = e.message || t('forum', 'An unexpected error occurred')
+        this.error = (e as Error).message || t('forum', 'An unexpected error occurred')
       } finally {
         this.loading = false
       }
@@ -153,9 +155,9 @@ export default {
       try {
         let resp
         if (this.categorySlug) {
-          resp = await ocs.get(`/categories/slug/${this.categorySlug}`)
+          resp = await ocs.get<Category>(`/categories/slug/${this.categorySlug}`)
         } else if (this.categoryId) {
-          resp = await ocs.get(`/categories/${this.categoryId}`)
+          resp = await ocs.get<Category>(`/categories/${this.categoryId}`)
         } else {
           throw new Error(t('forum', 'No category ID or slug provided'))
         }
@@ -168,7 +170,7 @@ export default {
 
     async fetchThreads() {
       try {
-        const resp = await ocs.get(`/categories/${this.category.id}/threads`, {
+        const resp = await ocs.get<Thread[]>(`/categories/${this.category!.id}/threads`, {
           params: {
             limit: this.limit,
             offset: this.offset,
@@ -181,7 +183,7 @@ export default {
       }
     },
 
-    navigateToThread(thread) {
+    navigateToThread(thread: Thread) {
       this.$router.push(`/t/${thread.slug}`)
     },
 
@@ -194,7 +196,7 @@ export default {
       this.$router.back()
     },
   },
-}
+})
 </script>
 
 <style scoped lang="scss">
diff --git a/src/views/ThreadView.vue b/src/views/ThreadView.vue
index 05d623a..0cf9340 100644
--- a/src/views/ThreadView.vue
+++ b/src/views/ThreadView.vue
@@ -3,12 +3,12 @@
     <!-- Toolbar -->
     <div class="toolbar">
       <div class="toolbar-left">
-        <NcButton type="tertiary" @click="goBack">{{ strings.back }}</NcButton>
+        <NcButton @click="goBack">{{ strings.back }}</NcButton>
       </div>
 
       <div class="toolbar-right">
         <NcButton @click="refresh" :disabled="loading">{{ strings.refresh }}</NcButton>
-        <NcButton type="primary" @click="replyToThread" :disabled="loading || thread?.isLocked">
+        <NcButton @click="replyToThread" :disabled="loading || thread?.isLocked">
           {{ strings.reply }}
         </NcButton>
       </div>
@@ -21,7 +21,12 @@
     </div>
 
     <!-- Error state -->
-    <NcEmptyContent v-else-if="error" :title="strings.errorTitle" :description="error" class="mt-16">
+    <NcEmptyContent
+      v-else-if="error"
+      :title="strings.errorTitle"
+      :description="error"
+      class="mt-16"
+    >
       <template #action>
         <NcButton @click="refresh">{{ strings.retry }}</NcButton>
       </template>
@@ -64,8 +69,15 @@
     <!-- Posts list -->
     <section v-if="!loading && !error && posts.length > 0" class="mt-16">
       <div class="posts-list">
-        <PostCard v-for="(post, index) in posts" :key="post.id" :post="post" :is-first-post="index === 0"
-          @reply="handleReply" @edit="handleEdit" @delete="handleDelete" />
+        <PostCard
+          v-for="(post, index) in posts"
+          :key="post.id"
+          :post="post"
+          :is-first-post="index === 0"
+          @reply="handleReply"
+          @edit="handleEdit"
+          @delete="handleDelete"
+        />
       </div>
 
       <!-- Pagination info -->
@@ -75,16 +87,21 @@
     </section>
 
     <!-- Empty posts state (thread exists but no posts) -->
-    <NcEmptyContent v-else-if="!loading && !error && thread && posts.length === 0" :title="strings.emptyPostsTitle"
-      :description="strings.emptyPostsDesc" class="mt-16">
+    <NcEmptyContent
+      v-else-if="!loading && !error && thread && posts.length === 0"
+      :title="strings.emptyPostsTitle"
+      :description="strings.emptyPostsDesc"
+      class="mt-16"
+    >
       <template #action>
-        <NcButton type="primary" @click="replyToThread">{{ strings.reply }}</NcButton>
+        <NcButton @click="replyToThread">{{ strings.reply }}</NcButton>
       </template>
     </NcEmptyContent>
   </div>
 </template>
 
 <script lang="ts">
+import { defineComponent } from 'vue'
 import NcButton from '@nextcloud/vue/components/NcButton'
 import NcEmptyContent from '@nextcloud/vue/components/NcEmptyContent'
 import NcLoadingIcon from '@nextcloud/vue/components/NcLoadingIcon'
@@ -93,11 +110,11 @@ import PostCard from '@/components/PostCard.vue'
 import PinIcon from '@icons/Pin.vue'
 import LockIcon from '@icons/Lock.vue'
 import EyeIcon from '@icons/Eye.vue'
-
+import type { Thread, Post } from '@/types'
 import { ocs } from '@/axios'
 import { t, n } from '@nextcloud/l10n'
 
-export default {
+export default defineComponent({
   name: 'ThreadView',
   components: {
     NcButton,
@@ -112,9 +129,9 @@ export default {
   data() {
     return {
       loading: false,
-      thread: null,
-      posts: [],
-      error: null,
+      thread: null as Thread | null,
+      posts: [] as Post[],
+      error: null as string | null,
       limit: 50,
       offset: 0,
 
@@ -128,26 +145,26 @@ export default {
         emptyPostsDesc: t('forum', 'Be the first to post in this thread.'),
         retry: t('forum', 'Retry'),
         by: t('forum', 'by'),
-        views: (count: string) => n('forum', '%n view', '%n views', count),
+        views: (count: number) => n('forum', '%n view', '%n views', count),
         pinned: t('forum', 'Pinned thread'),
         locked: t('forum', 'Locked thread'),
-        showingPosts: (count) => n('forum', 'Showing %n post', 'Showing %n posts', count),
+        showingPosts: (count: number) => n('forum', 'Showing %n post', 'Showing %n posts', count),
       },
     }
   },
   computed: {
-    threadId() {
-      return this.$route.params.id ? parseInt(this.$route.params.id) : null
+    threadId(): number | null {
+      return this.$route.params.id ? parseInt(this.$route.params.id as string) : null
     },
-    threadSlug() {
-      return this.$route.params.slug || null
+    threadSlug(): string | null {
+      return (this.$route.params.slug as string) || null
     },
   },
   created() {
     this.refresh()
   },
   methods: {
-    async refresh() {
+    async refresh(): Promise<void> {
       try {
         this.loading = true
         this.error = null
@@ -161,19 +178,19 @@ export default {
         }
       } catch (e) {
         console.error('Failed to refresh', e)
-        this.error = e.message || t('forum', 'An unexpected error occurred')
+        this.error = (e as Error).message || t('forum', 'An unexpected error occurred')
       } finally {
         this.loading = false
       }
     },
 
-    async fetchThread() {
+    async fetchThread(): Promise<void> {
       try {
         let resp
         if (this.threadSlug) {
-          resp = await ocs.get(`/threads/slug/${this.threadSlug}`)
+          resp = await ocs.get<Thread>(`/threads/slug/${this.threadSlug}`)
         } else if (this.threadId) {
-          resp = await ocs.get(`/threads/${this.threadId}`)
+          resp = await ocs.get<Thread>(`/threads/${this.threadId}`)
         } else {
           throw new Error(t('forum', 'No thread ID or slug provided'))
         }
@@ -184,9 +201,9 @@ export default {
       }
     },
 
-    async fetchPosts() {
+    async fetchPosts(): Promise<void> {
       try {
-        const resp = await ocs.get(`/threads/${this.thread.id}/posts`, {
+        const resp = await ocs.get<Post[]>(`/threads/${this.thread!.id}/posts`, {
           params: {
             limit: this.limit,
             offset: this.offset,
@@ -204,7 +221,7 @@ export default {
       }
     },
 
-    async markAsRead() {
+    async markAsRead(): Promise<void> {
       try {
         // Get the last post ID from the current view
         const lastPost = this.posts[this.posts.length - 1]
@@ -223,19 +240,19 @@ export default {
       }
     },
 
-    handleReply(post) {
+    handleReply(post: Post): void {
       console.log('Reply to post:', post.id)
       // TODO: Implement reply functionality
       // Could open a reply form or navigate to a reply page
     },
 
-    handleEdit(post) {
+    handleEdit(post: Post): void {
       console.log('Edit post:', post.id)
       // TODO: Implement edit functionality
       // Could open an edit dialog or navigate to edit page
     },
 
-    async handleDelete(post) {
+    async handleDelete(post: Post): Promise<void> {
       console.log('Delete post:', post.id)
       // TODO: Implement delete functionality with confirmation
       // if (confirm(t('forum', 'Are you sure you want to delete this post?'))) {
@@ -244,17 +261,17 @@ export default {
       // }
     },
 
-    replyToThread() {
+    replyToThread(): void {
       console.log('Reply to thread:', this.thread?.id)
       // TODO: Implement reply to thread functionality
       // Could open a reply form at the bottom or navigate to a reply page
     },
 
-    goBack() {
+    goBack(): void {
       this.$router.back()
     },
   },
-}
+})
 </script>
 
 <style scoped lang="scss">