refactor: update export syntax to default for ASR and VAST plugins

docs/assets/ts/artplayer-plugin-asr.d.ts

@@ -1,6 +1,3 @@
-export = artplayerPluginAsr
-export as namespace artplayerPluginAsr;
-
 interface AudioChunk {
   pcm: ArrayBuffer
   wav: ArrayBuffer
@@ -23,5 +20,7 @@ interface AsrPluginInstance {
 
 declare function artplayerPluginAsr(option?: AsrPluginOption): (art: Artplayer) => AsrPluginInstance
 
+export default artplayerPluginAsr
+
 export = artplayerPluginAsr;
 export as namespace artplayerPluginAsr;

docs/assets/ts/artplayer-plugin-vast.d.ts

@@ -1,6 +1,3 @@
-export = artplayerPluginVast
-export as namespace artplayerPluginVast;
-
 declare global {
   interface Window {
     artplayerPluginVast?: typeof artplayerPluginVast
@@ -12,7 +9,7 @@ type PlayResFn = (res: string) => void
 
 interface VastPluginContext {
   art: Artplayer
-  ima: typeof google.ima
+  ima: any // Replace 'any' with a more specific type if available, or declare google.ima type above
   imaPlayer: Player
   playUrl: PlayUrlFn
   playRes: PlayResFn
@@ -30,5 +27,7 @@ declare function artplayerPluginVast(
   option: ArtplayerPluginVastOption,
 ): (art: Artplayer) => ArtplayerPluginVastInstance
 
+export default artplayerPluginVast
+
 export = artplayerPluginVast;
 export as namespace artplayerPluginVast;