diff --git a/package-lock.json b/package-lock.json
index dc9cd61..3e5b8a3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -27,6 +27,7 @@
 				"@sveltejs/vite-plugin-svelte": "^5.0.0",
 				"@testing-library/jest-dom": "^6.6.3",
 				"@testing-library/svelte": "^5.2.4",
+				"@tsconfig/svelte": "^5.0.4",
 				"eslint": "^9.18.0",
 				"eslint-config-prettier": "^10.0.1",
 				"eslint-plugin-svelte": "^3.0.0",
@@ -35,8 +36,9 @@
 				"prettier": "^3.4.2",
 				"prettier-plugin-svelte": "^3.3.3",
 				"svelte": "^5.0.0",
-				"svelte-check": "^4.0.0",
-				"typescript": "^5.0.0",
+				"svelte-check": "^4.2.1",
+				"svelte-preprocess": "^6.0.3",
+				"typescript": "^5.8.3",
 				"typescript-eslint": "^8.20.0",
 				"vite": "^6.2.5",
 				"vitest": "^3.0.0"
@@ -1633,6 +1635,13 @@
 				}
 			}
 		},
+		"node_modules/@tsconfig/svelte": {
+			"version": "5.0.4",
+			"resolved": "https://registry.npmjs.org/@tsconfig/svelte/-/svelte-5.0.4.tgz",
+			"integrity": "sha512-BV9NplVgLmSi4mwKzD8BD/NQ8erOY/nUE/GpgWe2ckx+wIQF5RyRirn/QsSSCPeulVpc3RA/iJt6DpfTIZps0Q==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/@types/aria-query": {
 			"version": "5.0.4",
 			"resolved": "https://registry.npmjs.org/@types/aria-query/-/aria-query-5.0.4.tgz",
@@ -5672,9 +5681,9 @@
 			}
 		},
 		"node_modules/svelte-check": {
-			"version": "4.1.5",
-			"resolved": "https://registry.npmjs.org/svelte-check/-/svelte-check-4.1.5.tgz",
-			"integrity": "sha512-Gb0T2IqBNe1tLB9EB1Qh+LOe+JB8wt2/rNBDGvkxQVvk8vNeAoG+vZgFB/3P5+zC7RWlyBlzm9dVjZFph/maIg==",
+			"version": "4.2.1",
+			"resolved": "https://registry.npmjs.org/svelte-check/-/svelte-check-4.2.1.tgz",
+			"integrity": "sha512-e49SU1RStvQhoipkQ/aonDhHnG3qxHSBtNfBRb9pxVXoa+N7qybAo32KgA9wEb2PCYFNaDg7bZCdhLD1vHpdYA==",
 			"dev": true,
 			"license": "MIT",
 			"dependencies": {
@@ -5734,6 +5743,62 @@
 				}
 			}
 		},
+		"node_modules/svelte-preprocess": {
+			"version": "6.0.3",
+			"resolved": "https://registry.npmjs.org/svelte-preprocess/-/svelte-preprocess-6.0.3.tgz",
+			"integrity": "sha512-PLG2k05qHdhmRG7zR/dyo5qKvakhm8IJ+hD2eFRQmMLHp7X3eJnjeupUtvuRpbNiF31RjVw45W+abDwHEmP5OA==",
+			"dev": true,
+			"hasInstallScript": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">= 18.0.0"
+			},
+			"peerDependencies": {
+				"@babel/core": "^7.10.2",
+				"coffeescript": "^2.5.1",
+				"less": "^3.11.3 || ^4.0.0",
+				"postcss": "^7 || ^8",
+				"postcss-load-config": ">=3",
+				"pug": "^3.0.0",
+				"sass": "^1.26.8",
+				"stylus": ">=0.55",
+				"sugarss": "^2.0.0 || ^3.0.0 || ^4.0.0",
+				"svelte": "^4.0.0 || ^5.0.0-next.100 || ^5.0.0",
+				"typescript": "^5.0.0"
+			},
+			"peerDependenciesMeta": {
+				"@babel/core": {
+					"optional": true
+				},
+				"coffeescript": {
+					"optional": true
+				},
+				"less": {
+					"optional": true
+				},
+				"postcss": {
+					"optional": true
+				},
+				"postcss-load-config": {
+					"optional": true
+				},
+				"pug": {
+					"optional": true
+				},
+				"sass": {
+					"optional": true
+				},
+				"stylus": {
+					"optional": true
+				},
+				"sugarss": {
+					"optional": true
+				},
+				"typescript": {
+					"optional": true
+				}
+			}
+		},
 		"node_modules/svelte/node_modules/is-reference": {
 			"version": "3.0.3",
 			"resolved": "https://registry.npmjs.org/is-reference/-/is-reference-3.0.3.tgz",
diff --git a/package.json b/package.json
index a2f7e26..0c38498 100644
--- a/package.json
+++ b/package.json
@@ -25,6 +25,7 @@
 		"@sveltejs/vite-plugin-svelte": "^5.0.0",
 		"@testing-library/jest-dom": "^6.6.3",
 		"@testing-library/svelte": "^5.2.4",
+		"@tsconfig/svelte": "^5.0.4",
 		"eslint": "^9.18.0",
 		"eslint-config-prettier": "^10.0.1",
 		"eslint-plugin-svelte": "^3.0.0",
@@ -33,8 +34,9 @@
 		"prettier": "^3.4.2",
 		"prettier-plugin-svelte": "^3.3.3",
 		"svelte": "^5.0.0",
-		"svelte-check": "^4.0.0",
-		"typescript": "^5.0.0",
+		"svelte-check": "^4.2.1",
+		"svelte-preprocess": "^6.0.3",
+		"typescript": "^5.8.3",
 		"typescript-eslint": "^8.20.0",
 		"vite": "^6.2.5",
 		"vitest": "^3.0.0"
diff --git a/src/hooks.server.js b/src/hooks.server.ts
similarity index 100%
rename from src/hooks.server.js
rename to src/hooks.server.ts
diff --git a/src/lib/auth.js b/src/lib/auth.ts
similarity index 100%
rename from src/lib/auth.js
rename to src/lib/auth.ts
diff --git a/src/lib/components/ui/Alert.svelte b/src/lib/components/ui/Alert.svelte
index d461847..67d8238 100644
--- a/src/lib/components/ui/Alert.svelte
+++ b/src/lib/components/ui/Alert.svelte
@@ -46,7 +46,7 @@
 	}
 </style>
 
-<script>
+<script lang="ts">
 	export let type = 'info';
 	let classNames = '';
 	export { classNames as class };
diff --git a/src/lib/components/ui/Button.svelte b/src/lib/components/ui/Button.svelte
index dd05a7b..17974f3 100644
--- a/src/lib/components/ui/Button.svelte
+++ b/src/lib/components/ui/Button.svelte
@@ -173,7 +173,7 @@
 	}
 </style>
 
-<script>
+<script lang="ts">
 	export let href = null;
 	export let type = 'button';
 	export let size = 'md';
diff --git a/src/lib/components/ui/DeleteIconButton.svelte b/src/lib/components/ui/DeleteIconButton.svelte
index e2ef84c..f0d329f 100644
--- a/src/lib/components/ui/DeleteIconButton.svelte
+++ b/src/lib/components/ui/DeleteIconButton.svelte
@@ -11,7 +11,7 @@
 	}
 </style>
 
-<script>
+<script lang="ts">
 	import { page } from '$app/stores';
 	import Trash from '$lib/icons/Trash.svelte';
 	import Panel from '$lib/components/ui/Panel.svelte';
diff --git a/src/lib/components/ui/Modal/Modal.svelte b/src/lib/components/ui/Modal/Modal.svelte
index 44334c8..8023b79 100644
--- a/src/lib/components/ui/Modal/Modal.svelte
+++ b/src/lib/components/ui/Modal/Modal.svelte
@@ -41,7 +41,7 @@
 	}
 </style>
 
-<script>
+<script lang="ts">
 	import { fade } from 'svelte/transition';
 	export let size = 'xl'; // https://tailwindcss.com/docs/max-width#class-reference
 	export let open = false;
diff --git a/src/lib/components/ui/Modal/ModalContent.svelte b/src/lib/components/ui/Modal/ModalContent.svelte
index e386bc8..75e84c4 100644
--- a/src/lib/components/ui/Modal/ModalContent.svelte
+++ b/src/lib/components/ui/Modal/ModalContent.svelte
@@ -15,7 +15,7 @@
 	}
 </style>
 
-<script>
+<script lang="ts">
 	export let scroll = true;
 	export let padding = true;
 
diff --git a/src/lib/components/ui/Notification.svelte b/src/lib/components/ui/Notification.svelte
index 247e902..e8870fb 100644
--- a/src/lib/components/ui/Notification.svelte
+++ b/src/lib/components/ui/Notification.svelte
@@ -1,4 +1,4 @@
-<script>
+<script lang="ts">
 	export let title = 'Erfolgreich';
 	export let show = false;
 
diff --git a/src/lib/components/ui/Panel.svelte b/src/lib/components/ui/Panel.svelte
index ab1a807..fe1a64f 100644
--- a/src/lib/components/ui/Panel.svelte
+++ b/src/lib/components/ui/Panel.svelte
@@ -5,7 +5,7 @@
 	}
 </style>
 
-<script>
+<script lang="ts">
 	export let padding = 'p-6';
 	export let shadow = true;
 	let classNames = '';
diff --git a/src/lib/components/ui/Select.svelte b/src/lib/components/ui/Select.svelte
index d5752f3..7296d64 100644
--- a/src/lib/components/ui/Select.svelte
+++ b/src/lib/components/ui/Select.svelte
@@ -6,7 +6,7 @@
 	}
 </style>
 
-<script>
+<script lang="ts">
 	import { clickOutside } from '$lib/helpers/clickOutside.js';
 	import Check from '$lib/icons/Check.svelte';
 	import Selector from '$lib/icons/Selector.svelte';
diff --git a/src/lib/config.js b/src/lib/config.ts
similarity index 100%
rename from src/lib/config.js
rename to src/lib/config.ts
diff --git a/src/lib/helper/caseNumberOccupied.js b/src/lib/helper/caseNumberOccupied.ts
similarity index 100%
rename from src/lib/helper/caseNumberOccupied.js
rename to src/lib/helper/caseNumberOccupied.ts
diff --git a/src/lib/helper/shortenFileSize.js b/src/lib/helper/shortenFileSize.ts
similarity index 100%
rename from src/lib/helper/shortenFileSize.js
rename to src/lib/helper/shortenFileSize.ts
diff --git a/src/lib/helper/timeElapsed.js b/src/lib/helper/timeElapsed.ts
similarity index 100%
rename from src/lib/helper/timeElapsed.js
rename to src/lib/helper/timeElapsed.ts
diff --git a/src/lib/minio.js b/src/lib/minio.ts
similarity index 100%
rename from src/lib/minio.js
rename to src/lib/minio.ts
diff --git a/src/routes/(angemeldet)/+layout.server.js b/src/routes/(angemeldet)/+layout.server.ts
similarity index 100%
rename from src/routes/(angemeldet)/+layout.server.js
rename to src/routes/(angemeldet)/+layout.server.ts
diff --git a/src/routes/(angemeldet)/+layout.svelte b/src/routes/(angemeldet)/+layout.svelte
index a2c875c..77dd926 100644
--- a/src/routes/(angemeldet)/+layout.svelte
+++ b/src/routes/(angemeldet)/+layout.svelte
@@ -1,4 +1,4 @@
-<script>
+<script lang="ts">
 	import Chevron from '$lib/icons/Chevron-right.svelte';
 	import Login from '$lib/icons/Login.svelte';
 
diff --git a/src/routes/(angemeldet)/+page.svelte b/src/routes/(angemeldet)/+page.svelte
index 9974847..6148a0b 100644
--- a/src/routes/(angemeldet)/+page.svelte
+++ b/src/routes/(angemeldet)/+page.svelte
@@ -1,7 +1,7 @@
 <style>
 </style>
 
-<script>
+<script lang="ts">
 	import Panel from '$lib/components/ui/Panel.svelte';
 
 	export let data;
diff --git a/src/routes/(angemeldet)/list/[vorgang]/+server.js b/src/routes/(angemeldet)/list/[vorgang]/+server.ts
similarity index 100%
rename from src/routes/(angemeldet)/list/[vorgang]/+server.js
rename to src/routes/(angemeldet)/list/[vorgang]/+server.ts
diff --git a/src/routes/(angemeldet)/list/[vorgang]/[tatort]/+server.js b/src/routes/(angemeldet)/list/[vorgang]/[tatort]/+server.ts
similarity index 100%
rename from src/routes/(angemeldet)/list/[vorgang]/[tatort]/+server.js
rename to src/routes/(angemeldet)/list/[vorgang]/[tatort]/+server.ts
diff --git a/src/routes/(angemeldet)/tatorte/+page.server.js b/src/routes/(angemeldet)/tatorte/+page.server.ts
similarity index 100%
rename from src/routes/(angemeldet)/tatorte/+page.server.js
rename to src/routes/(angemeldet)/tatorte/+page.server.ts
diff --git a/src/routes/(angemeldet)/tatorte/+page.svelte b/src/routes/(angemeldet)/tatorte/+page.svelte
index f7c5dbd..2920917 100644
--- a/src/routes/(angemeldet)/tatorte/+page.svelte
+++ b/src/routes/(angemeldet)/tatorte/+page.svelte
@@ -1,4 +1,4 @@
-<script>
+<script lang="ts">
 	import Alert from '$lib/components/ui/Alert.svelte';
 	import Button from '$lib/components/ui/Button.svelte';
 	import Modal from '$lib/components/ui/Modal/Modal.svelte';
diff --git a/src/routes/(angemeldet)/upload/+page.server.js b/src/routes/(angemeldet)/upload/+page.server.ts
similarity index 100%
rename from src/routes/(angemeldet)/upload/+page.server.js
rename to src/routes/(angemeldet)/upload/+page.server.ts
diff --git a/src/routes/(angemeldet)/upload/+page.svelte b/src/routes/(angemeldet)/upload/+page.svelte
index fb6104e..ae8c820 100644
--- a/src/routes/(angemeldet)/upload/+page.svelte
+++ b/src/routes/(angemeldet)/upload/+page.svelte
@@ -1,4 +1,4 @@
-<script>
+<script lang="ts">
 	import { deserialize, enhance } from '$app/forms';
 	import Alert from '$lib/components/ui/Alert.svelte';
 	import Button from '$lib/components/ui/Button.svelte';
diff --git a/src/routes/(angemeldet)/view/+page.server.js b/src/routes/(angemeldet)/view/+page.server.ts
similarity index 100%
rename from src/routes/(angemeldet)/view/+page.server.js
rename to src/routes/(angemeldet)/view/+page.server.ts
diff --git a/src/routes/(angemeldet)/view/+page.svelte b/src/routes/(angemeldet)/view/+page.svelte
index 997ba49..4a84169 100644
--- a/src/routes/(angemeldet)/view/+page.svelte
+++ b/src/routes/(angemeldet)/view/+page.svelte
@@ -1,4 +1,4 @@
-<script>
+<script lang="ts">
 	import Alert from '$lib/components/ui/Alert.svelte';
 	import Button from '$lib/components/ui/Button.svelte';
 	import Modal from '$lib/components/ui/Modal/Modal.svelte';
diff --git a/src/routes/(angemeldet)/view/[vorgang]/[tatort]/+page.server.js b/src/routes/(angemeldet)/view/[vorgang]/[tatort]/+page.server.ts
similarity index 100%
rename from src/routes/(angemeldet)/view/[vorgang]/[tatort]/+page.server.js
rename to src/routes/(angemeldet)/view/[vorgang]/[tatort]/+page.server.ts
diff --git a/src/routes/(angemeldet)/view/[vorgang]/[tatort]/+page.svelte b/src/routes/(angemeldet)/view/[vorgang]/[tatort]/+page.svelte
index 37b0678..06e5408 100644
--- a/src/routes/(angemeldet)/view/[vorgang]/[tatort]/+page.svelte
+++ b/src/routes/(angemeldet)/view/[vorgang]/[tatort]/+page.svelte
@@ -11,7 +11,7 @@
 
 </style>
 
-<script>
+<script lang="ts">
 	import { preloadCode } from '$app/navigation';
 	import Panel from '$lib/components/ui/Panel.svelte';
 	import { onMount } from 'svelte';
diff --git a/src/routes/+layout.svelte b/src/routes/+layout.svelte
index 2e511e0..f87b35e 100644
--- a/src/routes/+layout.svelte
+++ b/src/routes/+layout.svelte
@@ -1,4 +1,4 @@
-<script>
+<script lang="ts">
 	import '../app.css';
 </script>
 
diff --git a/src/routes/anmeldung/+page.server.js b/src/routes/anmeldung/+page.server.ts
similarity index 100%
rename from src/routes/anmeldung/+page.server.js
rename to src/routes/anmeldung/+page.server.ts
diff --git a/src/routes/anmeldung/+page.svelte b/src/routes/anmeldung/+page.svelte
index d953f3b..3823376 100644
--- a/src/routes/anmeldung/+page.svelte
+++ b/src/routes/anmeldung/+page.svelte
@@ -1,4 +1,4 @@
-<script>
+<script lang="ts">
 	import Panel from '$lib/components/ui/Panel.svelte';
 	import Button from '$lib/components/ui/Button.svelte';
 	import Alert from '$lib/components/ui/Alert.svelte';
diff --git a/src/routes/api/list/[[vorgang]]/+server.js b/src/routes/api/list/[[vorgang]]/+server.ts
similarity index 100%
rename from src/routes/api/list/[[vorgang]]/+server.js
rename to src/routes/api/list/[[vorgang]]/+server.ts
diff --git a/src/routes/api/tatort/+server.js b/src/routes/api/tatort/+server.ts
similarity index 100%
rename from src/routes/api/tatort/+server.js
rename to src/routes/api/tatort/+server.ts
diff --git a/src/routes/api/upload/+server.js b/src/routes/api/upload/+server.ts
similarity index 100%
rename from src/routes/api/upload/+server.js
rename to src/routes/api/upload/+server.ts
diff --git a/tsconfig.json b/tsconfig.json
index 0b2d886..b0f348d 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -10,7 +10,9 @@
 		"sourceMap": true,
 		"strict": true,
 		"moduleResolution": "bundler"
-	}
+	},
+	"include": ["src/**/*", "src/node_modules"],
+	"exclude": ["node_modules/*", "__sapper__/*", "public/*"]
 	// Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
 	// except $lib which is handled by https://svelte.dev/docs/kit/configuration#files
 	//