[feature] remove code smells

src/main/services/bs-local-version.service.ts

@@ -15,7 +15,7 @@ import { copyDirectoryWithJunctions, deleteFolder, getFoldersInFolder, pathExist
 import { FolderLinkerService } from "./folder-linker.service";
 import { ReadStream, createReadStream } from "fs-extra";
 import readline from "readline";
-import { BehaviorSubject, Observable, Subject } from "rxjs";
+import { Observable, Subject } from "rxjs";
 
 export class BSLocalVersionService {
     private static instance: BSLocalVersionService;

src/main/services/liv/liv.service.ts

@@ -24,7 +24,7 @@ export class LivService {
         return execOnOs({
             win32: async () => {
                 const regRes = await regedit.promisified.list([this.livRegeditKey]).then(res => res[this.livRegeditKey]);
-                return regRes !== undefined && regRes.exists;
+                return regRes?.exists;
             }
         });
     }