feat: improved types, changes coming

MusicKitAPI.d.ts

@@ -0,0 +1,15 @@
+declare namespace MusicKit {
+    interface MusicKitAPI {
+        'music': (
+            path: string,
+            params: {
+                [key: string]: string
+            },
+            opts: {
+                'fetchOptions': RequestInit
+            }
+        ) => Promise<{
+            'data': unknown
+        }>
+    }
+}