text: const flatMap = require('lodash.flatmap')
  const BaseFilter = require('./base-filter')
  const getBlocksForRange = require('./getBlocksForRange')
  const { incrementHexInt } = require('./hexUtils')
  
  class TxFilter extends BaseFilter {
  
    constructor ({ provider, params }) {
      super()
      this.type = 'tx'
      this.provider = provider
    }
  
    async update ({ oldBlock, newBlock }) {
      const toBlock = oldBlock
      const fromBlock = incrementHexInt(oldBlock)
      const blocks = await getBlocksForRange({ provider: this.provider, fromBlock, toBlock })
      const blockTxHashes = flatMap(blocks, (block) => block.transactions)
      // add to results
      this.addResults(blockTxHashes)
    }
  
  }
  
  module.exports = TxFilter
  