refactor(multiple-subtitles): [PKG-MULTI-SUB-04] expose compatible runtime type entry

refactor/fixtures/consumers/multiple-subtitles-commonjs.ts

@@ -0,0 +1,11 @@
+import type Artplayer from 'artplayer'
+// eslint-disable-next-line ts/no-require-imports -- Exercise historical export-assignment consumers.
+import plugin = require('artplayer-plugin-multiple-subtitles')
+
+const vtt = plugin
+declare const art: Artplayer
+const options: Parameters<typeof vtt>[0] = { subtitles: [] }
+const result: ReturnType<ReturnType<typeof vtt>> = { name: 'multipleSubtitles' }
+const replacement: typeof vtt = (_option: Parameters<typeof vtt>[0]) => (_art: Artplayer) => result
+void vtt(options)(art).name
+void replacement