message: set plugin Context.customState: unknown
diff: @@ -137,7 +137,7 @@ export class PluginContext {
  * Used to store application specific custom state which is then available
  * to State Actions and similar constructs via the PluginContext.
  */
  - readonly customState: any = Object.create(null);
  + readonly customState: unknown = Object.create(null);
  initViewer(canvas: HTMLCanvasElement, container: HTMLDivElement) {
  try {
  