packages/node_modules/sublevel-pouchdb/src/batch.js

function addOperation(type, key, value, options) {
  var operation = {
    type: type,
    key: key,
    value: value,
    options: options
  };

  if (options && options.prefix) {
    operation.prefix = options.prefix;
    delete options.prefix;
  }

  this._operations.push(operation);

  return this;
}

function Batch(sdb) {
  this._operations = [];
  this._sdb = sdb;

  this.put = addOperation.bind(this, 'put');
  this.del = addOperation.bind(this, 'del');
}

var B = Batch.prototype;

B.clear = function () {
  this._operations = [];
};

B.write = function (cb) {
  this._sdb.batch(this._operations, cb);
};

export default Batch;