@converse/localforage-getitems/lib/idbKeyRange.js

Adds getItems method to localForage.

function getIDBKeyRange() {
    /* global IDBKeyRange, webkitIDBKeyRange, mozIDBKeyRange */
    if (typeof IDBKeyRange !== 'undefined') {
        return IDBKeyRange;
    }
    if (typeof webkitIDBKeyRange !== 'undefined') {
        return webkitIDBKeyRange;
    }
    if (typeof mozIDBKeyRange !== 'undefined') {
        return mozIDBKeyRange;
    }
}

var idbKeyRange = getIDBKeyRange();
export default idbKeyRange;