Add enum for media errors

src/types/mediaError.ts

@@ -0,0 +1,9 @@
+/**
+ * Error types used for reporting media playback errors.
+ */
+export enum MediaError {
+    MEDIA_DECODE_ERROR = 'mediadecodeerror',
+    MEDIA_NOT_SUPPORTED = 'medianotsupported',
+    NETWORK_ERROR = 'network',
+    SERVER_ERROR = 'servererror'
+}