added a simple test code

types/youtube-player/tsconfig.json

@@ -5,7 +5,6 @@
             "es6",
             "dom"
         ],
-        "jsx": "react",
         "noImplicitAny": true,
         "noImplicitThis": true,
         "strictNullChecks": true,

types/youtube-player/youtube-player-tests.ts

@@ -0,0 +1,48 @@
+import youTubePlayerFactory from 'youtube-player';
+import PlayerStates from 'youtube-player/dist/constants/PlayerStates';
+import { YouTubePlayer } from 'youtube-player/dist/types';
+
+youTubePlayerFactory('foo');
+const player: YouTubePlayer = youTubePlayerFactory(
+    document.getElementById('bar'),
+    {
+        width: 640,
+        height: 300,
+        videoId: 'aaaaaaaaaa',
+        playerVars: {
+            autoplay: 1,
+            cc_lang_pref: 'en_US',
+            cc_load_policy: 1,
+            color: 'white',
+            controls: 1,
+            disablekb: 0,
+            enablejsapi: 1,
+            end: 60,
+            fs: 0,
+            hl: 'fooBar',
+            iv_load_policy: 3,
+            list: 'bbbbbbbbbb',
+            listType: 'search',
+            loop: 0,
+            modestbranding: 1,
+            origin: 'https://definitelytyped.org/',
+            playlist: 'cccccccccc',
+            playsinline: 0,
+            rel: 1,
+            start: 3,
+            widget_referrer: 'nothing',
+        },
+        events: {
+            ready: (event: CustomEvent): void => {},
+            stateChange: (event: CustomEvent): void => {
+                console.log(player.getPlayerState() === PlayerStates.PLAYING);
+            },
+            playbackQualityChange: (event: CustomEvent): void => {},
+            playbackRateChange: (event: CustomEvent): void => {},
+            error: (event: CustomEvent): void => {},
+            apiChange: (event: CustomEvent): void => {},
+            volumeChange: (event: CustomEvent): void => {},
+        },
+    },
+    true,
+);