#434

frontend/src/lib/queryKeys.ts

@@ -157,6 +157,15 @@ export const sessionKeys = {
     settings: (id: number) => ['session', id, 'settings'] as const,
     themeSlots: (id: number) => ['session', id, 'themeSlots'] as const }
 
+export const isAuthorityDependentQuery = (key: readonly unknown[]): boolean => {
+  // Only the public locale catalogue and the explicitly synchronised session survive.
+  const publicLocaleFlg = key.length === 2
+      && key[0] === localesKeys.index[0] && key[1] === localesKeys.index[1]
+  const currentSessionFlg = key.length === 2
+      && key[0] === sessionKeys.current[0] && key[1] === sessionKeys.current[1]
+  return !publicLocaleFlg && !currentSessionFlg
+}
+
 export const theatresKeys = {
     show: (id: string, locale: LocaleCode) => ['theatres', locale, id] as const,
     programmes: (id: string, locale: LocaleCode) =>