diff --git a/frontend/components/build/Viewer.vue b/frontend/components/build/Viewer.vue
index 0c46c3d..e05ff7c 100644
--- a/frontend/components/build/Viewer.vue
+++ b/frontend/components/build/Viewer.vue
@@ -54,7 +54,7 @@ function selectBuild(index: number): void {
         v-for="(build, i) in builds"
         :key="i"
         :keystone-id="build.runeKeystone"
-        :item-id="build.items.children[0].data"
+        :item-id="build.items.children[0].data!"
         :keystore="perks"
         :item-map="itemMap"
         :pickrate="build.pickrate"
diff --git a/frontend/composables/useItemMap.ts b/frontend/composables/useItemMap.ts
index c154199..be4b49b 100644
--- a/frontend/composables/useItemMap.ts
+++ b/frontend/composables/useItemMap.ts
@@ -1,3 +1,5 @@
+import type { Item } from '~/types/cdragon'
+
 /**
  * Composable for fetching and managing item data from CDragon API
  * Returns a reactive Map of item ID to item data
diff --git a/frontend/composables/useRuneStyles.ts b/frontend/composables/useRuneStyles.ts
index c3404c5..e5b9cd6 100644
--- a/frontend/composables/useRuneStyles.ts
+++ b/frontend/composables/useRuneStyles.ts
@@ -1,3 +1,5 @@
+import type { Perk, PerkStyle } from '~/types/cdragon'
+
 /**
  * Composable for fetching and managing rune styles and keystones
  * Transforms rune data into format needed for display components
diff --git a/frontend/composables/useSummonerSpellMap.ts b/frontend/composables/useSummonerSpellMap.ts
index 811c2cd..8e18e6e 100644
--- a/frontend/composables/useSummonerSpellMap.ts
+++ b/frontend/composables/useSummonerSpellMap.ts
@@ -1,3 +1,5 @@
+import type { SummonerSpell } from '~/types/cdragon'
+
 /**
  * Composable for fetching and managing summoner spell data from CDragon API
  * Returns a reactive Map of spell ID to spell data