Using Packages

import { TaskContext } from "compose";

import {
  concat,
  keccak256,
  Address,
  Hex,
  pad,
  stringToHex,
  numberToHex,
} from "viem";

export async function main({ evm, env }: TaskContext) {
  // do some logic that calls viem utilities
  const resultId = keccak256(
    concat([
      stringToHex(assetPair === AssetPair.TEST ? "TEST1" : CHAINLINK_CANDLE_IDENTIFIER, { size: 32 }),
      stringToHex(assetPair, { size: 32 }),
      numberToHex(durationInSeconds, { size: 32 }),
      numberToHex(startTimestamp, { size: 32 }),
    ])
  );

  console.log(resultId);
}