refactor(jassub): [PKG-JASSUB-04] migrate owned TypeScript and preserve public types

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

@@ -1,5 +0,0 @@
-import { registerJassub } from './registration.js'
-
-export default function artplayerPluginJassub(option) {
-  return art => registerJassub(art, option)
-}

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

@@ -0,0 +1,7 @@
+import type { RuntimeOption } from '../types/runtime-api.js'
+import type { JassubHost } from './registration.js'
+import { registerJassub } from './registration.js'
+
+export default function artplayerPluginJassub(option?: RuntimeOption) {
+  return (art: JassubHost) => registerJassub(art, option)
+}

packages/artplayer-plugin-jassub/src/jassub.es.d.ts

@@ -0,0 +1,12 @@
+import type { RuntimeInstance, RuntimeOption } from '../types/runtime-api.js'
+
+interface VendorInstance extends RuntimeInstance {
+  _destroyed?: boolean
+  // Minimal write contract: the DOM setter coerces the historical numeric 20.
+  _canvasParent?: { style: { zIndex: string | number } }
+}
+
+declare const JASSUB: {
+  new (option: RuntimeOption): VendorInstance
+}
+export default JASSUB

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

@@ -1,6 +1,13 @@
+import type { RuntimeOption, RuntimeResult } from '../types/runtime-api.js'
 import JASSUB from './jassub.es.js'
 
-export function registerJassub(art, option) {
+export interface JassubHost {
+  video: HTMLVideoElement
+  on: (name: 'destroy', callback: () => void) => unknown
+  off: (name: 'destroy', callback: () => void) => unknown
+}
+
+export function registerJassub(art: JassubHost, option?: RuntimeOption): RuntimeResult {
   const instance = new JASSUB({ video: art.video, ...option })
   let disposed = false
   const dispose = () => {