feat: add canBeUsed to TTSModule

src/modules/tts-modes/azure.ts

@@ -32,6 +32,10 @@ class AzureTTS implements TTSModule {
 
 		return { data: Buffer.concat(buffers) };
 	}
+
+	async canBeUsed(): Promise<boolean> {
+		return true;
+	}
 }
 
 export default new AzureTTS();

src/modules/tts-modes/google.ts

@@ -41,6 +41,10 @@ const ttsGoogle: TTSModule = {
 				resolve({ error: 'timed out' });
 			});
 		});
+	},
+
+	async canBeUsed(): Promise<boolean> {
+		return true;
 	}
 };
 

src/modules/tts.ts

@@ -13,6 +13,7 @@ export interface TTSModule {
 	name: string;
 	getVoices: () => Promise<Array<string> | undefined>;
 	generate: (voice: string, text: string) => Promise<TTSResponse>;
+	canBeUsed: () => Promise<boolean>;
 }
 
 export class TTSManager {