refactor(jassub): [PKG-JASSUB-03] isolate registration and fix adapter cleanup

packages/artplayer-plugin-jassub/src/index.js

@@ -1,21 +1,5 @@
-import JASSUB from './jassub.es.js'
+import { registerJassub } from './registration.js'
 
 export default function artplayerPluginJassub(option) {
-  return (art) => {
-    const instance = new JASSUB({
-      video: art.video,
-      ...option,
-    })
-
-    instance._canvasParent.style.zIndex = 20
-
-    art.on('destroy', () => {
-      instance.destroy()
-    })
-
-    return {
-      name: 'artplayerPluginJassub',
-      instance,
-    }
-  }
+  return art => registerJassub(art, option)
 }

packages/artplayer-plugin-jassub/src/registration.js

@@ -0,0 +1,39 @@
+import JASSUB from './jassub.es.js'
+
+export function registerJassub(art, option) {
+  const instance = new JASSUB({ video: art.video, ...option })
+  let disposed = false
+  const dispose = () => {
+    if (disposed || instance._destroyed)
+      return
+    disposed = true
+    try {
+      instance.destroy()
+    }
+    catch (error) {
+      disposed = false
+      throw error
+    }
+  }
+
+  try {
+    if (instance._canvasParent)
+      instance._canvasParent.style.zIndex = 20
+    art.on('destroy', dispose)
+  }
+  catch (error) {
+    // Registration may throw after attaching its listener. Keep the original
+    // error while independently attempting listener and instance rollback.
+    try {
+      art.off('destroy', dispose)
+    }
+    catch {}
+    try {
+      dispose()
+    }
+    catch {}
+    throw error
+  }
+
+  return { name: 'artplayerPluginJassub', instance }
+}