async setupFSOutput() {
    // Create directory if not exists
    xfs.mkdirpSync(this.targetDir);

    // Verify target directory if forceWrite is not enabled
    if (!this.forceWrite) {
      await this.verifyTargetDir(this.targetDir);
    }
  }
Sets up the file system (FS) output configuration.

This function creates the target directory if it does not exist and verifies
the target directory if forceWrite is not enabled.

@async
@returns {Promise<void>} A promise that fulfills when the setup is complete.

@throws {Error} If verification of the target directory fails and forceWrite is not enabled.