diff --git a/src/lib/interfaces.ts b/src/lib/interfaces.ts
index f4a2057..f64597a 100644
--- a/src/lib/interfaces.ts
+++ b/src/lib/interfaces.ts
@@ -1,27 +1,7 @@
+export {};
+
 declare global {
 	interface Window {
-		dataLayer: Array<any>;
+		dataLayer: object[];
 	}
 }
-
-export interface ExternalLinkItem {
-	identifier: string;
-	name: string;
-	url: string;
-	weight: number;
-}
-
-export interface Metadata {
-	name: string;
-	items: Array<MetadataItem>;
-}
-
-export interface MetadataItem {
-	title: string;
-	slug: string;
-	headline: string;
-}
-
-export interface DynamicObject {
-	[key: string]: any;
-}
diff --git a/src/sveltin.d.ts b/src/sveltin.d.ts
new file mode 100644
index 0000000..ed80e2f
--- /dev/null
+++ b/src/sveltin.d.ts
@@ -0,0 +1,36 @@
+declare namespace Sveltin {
+	export interface ContentEntry {
+		resource: string;
+		metadata: YAMLFrontmatter;
+		html?: string;
+	}
+
+	export interface ContentMetadata {
+		name: string;
+		items: Array<YAMLFrontmatter>;
+	}
+
+	export interface YAMLFrontmatter {
+		title: string;
+		slug: string;
+		draft: boolean;
+		headline: string;
+		headings: Array<TOCEntry>;
+		author?: string;
+		created_at?: string;
+		updated_at?: string;
+		cover?: string;
+		[key: string]: string | number | object | [];
+	}
+
+	export interface TOCEntry {
+		id: string;
+		title: string;
+		depth: number;
+		children?: Array<TOCEntry>;
+	}
+
+	export interface DynamicObject {
+		[key: string]: string | number | object | [];
+	}
+}
diff --git a/tsconfig.json b/tsconfig.json
index f57c3b2..2fad6d2 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,16 +1,27 @@
 {
 	"extends": "./.svelte-kit/tsconfig.json",
 	"compilerOptions": {
+		"allowJs": true,
+		"checkJs": true,
+		"esModuleInterop": true,
+		"forceConsistentCasingInFileNames": true,
+		"lib": ["es2020", "DOM"],
+		"moduleResolution": "node",
+		"module": "es2020",
+		"resolveJsonModule": true,
+		"skipLibCheck": true,
+		"sourceMap": true,
+		"target": "es2020",
 		"outDir": "./build",
 		"paths": {
-			"$lib": ["src/lib"],
-			"$lib/*": ["src/lib/*"],
-			"$config": ["config"],
-			"$config/*": ["config/*"],
-			"$content": ["content"],
-			"$content/*": ["content/*"],
-			"$themes": ["themes"],
-			"$themes/*": ["themes/*"]
+			"$lib": ["./src/lib"],
+			"$lib/*": ["./src/lib/*"],
+			"$config": ["./config"],
+			"$config/*": ["./config/*"],
+			"$content": ["./content"],
+			"$content/*": ["./content/*"],
+			"$themes": ["./themes"],
+			"$themes/*": ["./themes/*"]
 		}
 	},
 	"include": [