fix(dpip): [PKG-DPIP-04] preserve factory type and export compatibility

refactor/fixtures/consumers/dpip-published.ts

@@ -0,0 +1,16 @@
+import Artplayer from 'artplayer'
+import dpip from 'artplayer-plugin-document-pip'
+
+const options: Parameters<typeof dpip>[0] = { width: 640, height: 360, placeholder: 'Active', fallbackToVideoPiP: true }
+const art = new Artplayer({ container: '#player', url: 'video.mp4', plugins: [dpip(options)] })
+const result = dpip(options)(art)
+const returned: void = result.open()
+result.open = () => {}
+result.close = () => {}
+const fake: ReturnType<ReturnType<typeof dpip>> = { name: 'artplayerPluginDocumentPip', isSupported: true, isActive: false, open() {}, close() {}, toggle() {} }
+fake.isActive = true
+fake.isSupported = false
+const initializer: ReturnType<typeof dpip> = () => fake
+const inferredInitializer = dpip(options)
+const oldReplacement: typeof inferredInitializer = () => fake
+void [returned, initializer, inferredInitializer, oldReplacement]