feat: basic initial types

MusicKit.d.ts

@@ -0,0 +1,38 @@
+declare namespace MusicKit {
+    interface MusicKitConfiguration {
+        /**
+         * See https://js-cdn.music.apple.com/musickit/v3/docs/iframe.html?path=/story/get-started--page#configuring-musickit-on-the-web
+         */
+        'developerToken': string;
+
+        /**
+         * Your application configuration
+         */
+        'app': {
+            /**
+             * The name of your application
+             */
+            'name': string;
+
+            /**
+             * Build or version number of application
+             */
+            'build'?: string;
+
+            /**
+             * A URL to your application logo. Should be square at 152x152px
+             */
+            'icon'?: string;
+        };
+
+        'bitrate'?: PlaybackBitrate;
+
+        /**
+         * Set the storefront, which is set for the API requests.
+         * If unset, then the authenticated user's storefrontId will be used.
+         */
+        'storefrontId'?: string;
+    }
+
+    function configure ( config: MusicKitConfiguration ): Promise<MusicKitInstance>;
+}