DynamoDB JS FilterExpression with IN clause

example.js

function generateParametersList (name = '', params) {
  return _.chain(params)
    .uniq()
    .map((param, i) => ({ [`:${name}${i}`]: param }))
    .reduce((acc, curr) => ({ ...acc, ...curr }))
    .value()
}

const typesMapping = generateParametersList('type', types)
  
const params = {
  TableName: 'MyTable',
  KeyConditionExpression: '#da = :date AND #lo = :location',
  IndexName: 'location-date-index',
  FilterExpression: `#ty IN (${Object.keys(typesMapping).join(', ')})`,
  ExpressionAttributeNames: {
    '#da': 'date',
    '#lo': 'location',
    '#ty': 'type'
  },
  ExpressionAttributeValues: {
    ':date': date,
    ':location': parseInt(location),
    ...typesMapping
  }
}

Wanted to share this as it took quite a while to decipher dynamoDB's documentation and understand that you cannot pass an array as an ExpressionAttributeValues, even tho there are no errors showing up (the results will be always empty)