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The POSClient has an erc20 method which returns an object of an ERC20 token.

You can then call various methods on the object.

const erc20token = posClient.erc20(<token address>,<isRoot>);

Passing second arguments for isRoot is optional.

Child token

Token on polygon can be initiated by using this syntax -

const childERC20Token = posClient.erc20(<child token address>);

Parent token

Token on ethereum can be initiated by providing the second parameter value as true.

const parentERC20Token = posClient.erc20(<parent token address>, true);