Added getAvailableSpellCheckLanguages() methods

src/BasePlatform.ts

@@ -237,6 +237,10 @@ export default abstract class BasePlatform {
 
     setLanguage(preferredLangs: string[]) {}
 
+    getAvailableSpellCheckLanguages(): Promise<string[]> | null {
+        return null;
+    }
+
     protected getSSOCallbackUrl(fragmentAfterLogin: string): URL {
         const url = new URL(window.location.href);
         url.hash = fragmentAfterLogin || "";

src/languageHandler.tsx

@@ -353,6 +353,11 @@ export function setSpellCheckLanguages(preferredLangs: string[]) {
     }
 }
 
+export async function getAvailableSpellCheckLanguages(): Promise<string[]> {
+    const plaf = PlatformPeg.get();
+    return plaf.getAvailableSpellCheckLanguages();
+}
+
 export function getAllLanguagesFromJson() {
     return getLangsJson().then((langsObject) => {
         const langs = [];