diff --git a/src/lib/AbstractChatCompletionRunner.ts b/src/lib/AbstractChatCompletionRunner.ts
index c8be63ab3..60b1e5602 100644
--- a/src/lib/AbstractChatCompletionRunner.ts
+++ b/src/lib/AbstractChatCompletionRunner.ts
@@ -252,6 +252,8 @@ export abstract class AbstractChatCompletionRunner<
         return message.function_call;
       }
     }
+
+    return;
   }
 
   /**
@@ -270,6 +272,8 @@ export abstract class AbstractChatCompletionRunner<
         return message.content as string;
       }
     }
+
+    return;
   }
 
   async finalFunctionCallResult(): Promise<string | undefined> {
diff --git a/tsconfig.json b/tsconfig.json
index 4bc150677..9908b2c80 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -27,6 +27,7 @@
     "strictBindCallApply": true,
     "strictPropertyInitialization": true,
     "noImplicitThis": true,
+    "noImplicitReturns": true,
     "alwaysStrict": true,
     "exactOptionalPropertyTypes": true,
     "noUncheckedIndexedAccess": true,