Remove backward compatibility.

assets/style.css

@@ -3,7 +3,6 @@
   flex-direction: column;
 }
 
-/* For Peertube >= 3.2.0 */
 #plugin-placeholder-player-next #peertube-plugin-livechat-container {
   height: 100%;
 }

client/videowatch-client-plugin.ts

@@ -1,11 +1,9 @@
 import { videoHasWebchat } from 'shared/lib/video'
 
-interface VideoCache {[key: string]: Video}
-
 interface VideoWatchLoadedHookOptions {
   videojs: any
-  video?: Video // comes with Peertube 3.2.0
-  playlist?: any // comes with Peertube 3.2.0
+  video: Video
+  playlist?: any
 }
 
 function register ({ registerHook, peertubeHelpers }: RegisterOptions): void {
@@ -16,10 +14,6 @@ function register ({ registerHook, peertubeHelpers }: RegisterOptions): void {
     warn: (s: string) => console.warn('[peertube-plugin-livechat] ' + s)
   }
 
-  // This is for backward compatibility with Peertube < 3.2.0.
-  const videoCache: VideoCache = {}
-  let lastUUID: string | null = null
-
   let settings: any = {}
 
   function getBaseRoute (): string {
@@ -178,10 +172,7 @@ function register ({ registerHook, peertubeHelpers }: RegisterOptions): void {
       logger.error('No video provided')
       return
     }
-    // Peertube >= 3.2.0 provide #plugin-placeholder-player-next
-    const placeholder =
-      document.getElementById('plugin-placeholder-player-next') ??
-      document.getElementById('video-wrapper')
+    const placeholder = document.getElementById('plugin-placeholder-player-next')
     if (!placeholder) {
       logger.error('The required placeholder div is not present in the DOM.')
       return
@@ -220,16 +211,6 @@ function register ({ registerHook, peertubeHelpers }: RegisterOptions): void {
     })
   }
 
-  registerHook({
-    target: 'filter:api.video-watch.video.get.result',
-    handler: (video: Video) => {
-      // For Peertube < 3.2.0, hooks for action:video-watch... did not receive the video object
-      // So we store video objects in videoCache
-      videoCache[video.uuid] = video
-      lastUUID = video.uuid
-      return video
-    }
-  })
   registerHook({
     target: 'action:video-watch.video.loaded',
     handler: ({
@@ -237,17 +218,8 @@ function register ({ registerHook, peertubeHelpers }: RegisterOptions): void {
       playlist
     }: VideoWatchLoadedHookOptions) => {
       if (!video) {
-        logger.info('It seems we are using Peertube < 3.2.0. Using a cache to get the video object')
-        const uuid = lastUUID
-        if (!uuid) {
-          logger.error('There is no lastUUID.')
-          return
-        }
-        video = videoCache[uuid]
-        if (!video) {
-          logger.error('Can\'t find the video ' + uuid + ' in the videoCache')
-          return
-        }
+        logger.error('No video argument in hook action:video-watch.video.loaded')
+        return
       }
       if (playlist) {
         logger.info('We are in a playlist, we will not use the webchat')