deposit
The deposit
method can be used to deposit required amount from root token to child token.
const erc20RootToken = posClient.erc20(<root token address>, true);
//deposit 100 to user address
const result = await erc20Token.deposit(100, <user address>);
const txHash = await result.getTransactionHash();
const txReceipt = await result.getReceipt();
It might take some time to see the deposited amount on polygon chain. You can use isDeposited method for checking status.