refactor(multiple-subtitles): [PKG-MULTI-SUB-04] type runtime modules and vendor boundaries

packages/artplayer-plugin-multiple-subtitles/src/index.ts

@@ -0,0 +1,44 @@
+import type Artplayer from 'artplayer'
+import type { Option, Result, Track } from './types'
+import createLifetime from './lifetime'
+import { parseTracks, serializeTracks } from './merge'
+import createRenderer from './render'
+import loadVtt from './request'
+
+export default function artplayerPluginMultipleSubtitles({ subtitles = [] }: Option) {
+  return async (art: Artplayer): Promise<Result> => {
+    const { unescape, getExt, srtToVtt, assToVtt } = (art.constructor as typeof Artplayer).utils
+    const lifetime = createLifetime(art)
+    const render = createRenderer(art, lifetime, unescape)
+    let trees: Track[] = []
+    function setTracks(selected: readonly (Track | undefined)[]): void {
+      if (!lifetime.closed)
+        render(serializeTracks(selected))
+    }
+    const result: Result = {
+      name: 'multipleSubtitles',
+      tracks(names = []) {
+        if (!lifetime.closed)
+          setTracks(names.map(name => trees.find(tree => tree.name === name)))
+      },
+      reset() {
+        setTracks(trees)
+      },
+    }
+    try {
+      if (lifetime.closed)
+        return result
+      const vtts = await Promise.all(subtitles.map(option => loadVtt(option, { getExt, srtToVtt, assToVtt }, lifetime)))
+      if (lifetime.closed)
+        return result
+      // A live completed request yields text; cancellation was checked above.
+      trees = parseTracks(vtts as string[], subtitles)
+      setTracks(trees)
+      return result
+    }
+    catch (error) {
+      lifetime.dispose()
+      throw error
+    }
+  }
+}