withdrawExit method can be used to exit the withdraw process by using the txHash from
Note- withdrawStart transaction must be checkpointed in order to exit the withdraw.
const erc20RootToken = posClient.erc20(<root token address>, true);
const result = await erc20Token.withdrawExit(<burn tx hash>);
const txHash = await result.getTransactionHash();
const txReceipt = await result.getReceipt();
This method does multiple RPC calls to generate the proof and process exit. So it is recommended to use withdrawExitFaster method.