@swapper-finance/sdk/src/utils/getTokenAmountOut.ts

JavaScript SDK form Swapper

import { ContractReceipt, ethers } from "ethers"; // Import necessary types from ethers

const getTokenAmountOut = async (
  contractReceipt: ContractReceipt, // The receipt after transaction
  tokenAddress: string, // The address of the token being transferred
  receiverAddress: string, // The address that receives the tokens
): Promise<string> => {
  // Loop through the logs to find the correct token transfer event
  for (const log of contractReceipt.logs) {
    // Check if this is a Transfer event
    const topics = log.topics || [];
    const isCallsExecutedEvent =
      topics[0] ===
      ethers.utils.id("CallsExecuted(address,address,uint256,address,uint256)");
    if (isCallsExecutedEvent) {
      try {
        const tokenReceiver = ethers.utils.getAddress(
          "0x" + topics[1]?.substring(26),
        );
        const tokenOut = ethers.utils.defaultAbiCoder
          .decode(["address", "uint256", "address", "uint256"], log.data)[2]
          .toString();
        if (
          tokenReceiver.toLowerCase() === receiverAddress.toLowerCase() &&
          tokenOut.toLowerCase() === tokenAddress.toLowerCase()
        ) {
          const tokenOutReceived = ethers.utils.defaultAbiCoder
            .decode(["address", "uint256", "address", "uint256"], log.data)[3]
            .toString();
          return tokenOutReceived;
        }
      } catch (err) {
        console.error("Error parsing log:", err);
      }
    }
  }

  return "0";
};

export default getTokenAmountOut;