@ieigen/zkzru/src/txTree.js

An implementation of [ZK-ZKRollup](https://github.com/ieigen/ZKZRU) in which the relayer **does not** publish transaction data to the main chain, but only publishes the new Merkle root at every update. This provides gas savings but not data availability g

const Tree = require("./tree.js");

module.exports = class TxTree extends Tree {
  constructor(
      _txs
  ) {
    super(_txs.map((x) => x.hashTx()))
    this.txs = _txs
  }

  checkTxExistence(tx, txProof) {
    const txIdx = this.findTxIdx(tx.hash);
    if (!this.verifyProof(tx.hash, txIdx, txProof)) {
      throw new Error("tx does not exist")
    }
  }

  getTxProofAndProofPos(tx) {
    const txIdx = this.findTxIdx(tx.hash)
    const proofObj = this.getProof(txIdx)
    return [proofObj.proof, proofObj.proofPos]
  }

  findTxIdx(txHash) {
    const txIdx = this.txs.findIndex((tx) => tx.hash == txHash)
    return txIdx
  }
}