nl_tokens: Deletes the backup directory .
pl_tokens: function deleteBackup ( config ) { return new Promise ( ( resolve , reject ) => { const backupPath = path . <mask> ( process . cwd ( ) , ( config . backup !== undefined ) ? config . backup : ".backup" ) ; fs . remove ( backupPath , ( error ) => { ( error === null ) ? resolve ( config ) : reject ( error ) ; } ) ; } ) ; }