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The approveMax method can be used to approve max amount on the root token. 
const erc20RootToken = posClient.erc20(<root token address>, true);

const approveResult = await erc20RootToken.approveMax();

const txHash = await approveResult.getTransactionHash();

const txReceipt = await approveResult.getReceipt();

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spenderAddress

The address on which approval is given is called spenderAddress. It is a third-party user or a smart contract which can transfer your token on your behalf. By default spenderAddress value is erc20 predicate address. You can specify spender address value manually. 
const erc20RootToken = posClient.erc20(<root token address>,true);

// approve 100 amount
const approveResult = await erc20Token.approveMax({
    spenderAddress: <spender address value>
});

const txHash = await approveResult.getTransactionHash();

const txReceipt = await approveResult.getReceipt();