let params = {
  TableName:  'xxx',
  Limit: 50 // Configure based on needs
};
let aItems = [];
const recursiveScan = (params) => {
    return client.scan(params).promise().then((data) => {
        //  Simple Changes to input, optional
        let newItems = data.Items.map((item) => {
            return item;
        });
        aItems = aItems.concat(newItems);
        if(data.LastEvaluatedKey != null){
            params.ExclusiveStartKey = data.LastEvaluatedKey;
            //  Recursive call, as deep as we can loop !
            return recursiveScan(params);
        }
        return Promise.resolve(aItems);
    }).then((items) => {
        if(items != null && items.length != null)
            console.log("Final List : " + items.length);
    }).catch((error) => {
        console.log(error);
        console.log(JSON.stringify(error));
    });
};