prepareDB1.js

const database = new AWS.DynamoDB()
const neededTables = TABLES_PARAMS.map(({ TableName }) => TableName)
const existingTables = await database
  .listTables()
  .promise()
  .then(data => data.TableNames)

const dbsToDelete = _.without(existingTables, ...neededTables)
const dbsToCreate = _.without(neededTables, ...existingTables)

await Promise.all(
  dbsToDelete.map(TableName =>
    database.deleteTable({ TableName }).promise()
  )
)
await Promise.all(
  dbsToCreate.map(TableName =>
    database
      .createTable(TABLES_PARAMS.find(t => t.TableName === TableName))
      .promise()
  )
)