refactor(utils::removeDir): remove nodejs 12 workaround

should likely have been done for 9.x

packages/mongodb-memory-server-core/src/util/utils.ts

@@ -318,14 +318,6 @@ export async function createTmpDir(prefix: string, atPath?: string): Promise<str
   return fspromises.mkdtemp(path.join(tmpPath, prefix));
 }
 
-// outsourced instead of () or without, because prettier cant decide which it wants
-type tfsPromises = typeof fspromises;
-
-// workaround for already using @types/node 14 (instead of 12)
-interface RmDir {
-  rmdir: tfsPromises['rmdir'];
-}
-
 /**
  * Removes the given "path", if it is a directory, and does not throw a error if not existing
  * @param dirPath The Directory Path to delete
@@ -342,16 +334,7 @@ export async function removeDir(dirPath: string): Promise<void> {
     throw new Error(`Given Path is not a directory! (Path: "${dirPath}")`);
   }
 
-  if ('rm' in fspromises) {
-    // only since NodeJS 14
-    await fspromises.rm(dirPath, { force: true, recursive: true });
-  } else {
-    // before NodeJS 14
-    // needs the bridge via the interface, because we are using @types/node 14, where this if evaluates to a always "true" in typescript's eyes
-    await (fspromises as RmDir).rmdir(dirPath, {
-      recursive: true,
-    });
-  }
+  await fspromises.rm(dirPath, { force: true, recursive: true });
 }
 
 /**