approve

approve method can be used to approve required amount on root token.

approve is required in order to deposit amount on polygon chain.

const erc20RootToken = plasmaClient.erc20(<root token address>, true);

// approve 100 amount
const approveResult = await erc20Token.approve(100);

const txHash = await approveResult.getTransactionHash();

const txReceipt = await approveResult.getReceipt();