How to use the pouchdb-adapter-utils.isDeleted function in pouchdb-adapter-utils

tx.executeSql(sql, [], function (tx, result) {

          var deleted = [];
          var local = [];

          for (var i = 0; i < result.rows.length; i++) {
            var item = result.rows.item(i);
            var seq = item.seq;
            var metadata = JSON.parse(item.metadata);
            if (isDeleted(metadata)) {
              deleted.push(seq);
            }
            if (isLocalId(metadata.id)) {
              local.push(metadata.id);
            }
          }
          tx.executeSql('UPDATE ' + DOC_STORE + 'SET local = 1 WHERE id IN ' +
            qMarks(local.length), local, function () {
            tx.executeSql('UPDATE ' + BY_SEQ_STORE +
              ' SET deleted = 1 WHERE seq IN ' +
              qMarks(deleted.length), deleted, callback);
          });
        });
      });

function getIsDeleted(metadata, winningRev) {
  return 'deleted' in metadata ?
    metadata.deleted : pouchdbAdapterUtils.isDeleted(metadata, winningRev);
}

function getIsDeleted(metadata, winningRev) {
  return 'deleted' in metadata ?
    metadata.deleted : isDeleted(metadata, winningRev);
}

function getIsDeleted(metadata, winningRev) {
  return 'deleted' in metadata ?
    metadata.deleted : pouchdbAdapterUtils.isDeleted(metadata, winningRev);
}

function getIsDeleted(metadata, winningRev) {
  return 'deleted' in metadata ?
    metadata.deleted : isDeleted(metadata, winningRev);
}

function getIsDeleted (metadata, winningRev) {
  return 'deleted' in metadata
    ? metadata.deleted
    : isDeleted(metadata, winningRev)
}