Migration guide

There are some breaking changes between v1 and v2 of v9s. First of all, the chain execution direction was changed to the human friendly left-to-right. Second, the default library export (default export) became a function which specifies a type of error messages and the optional default error message. Third, check method returns T | undefined (here T - the error message type) instead of T | boolean.

If you want to preserve of v1 behavior use the simplify wrapper and reverse the rule order:

To receive only a true/false result follow the next pattern (the chain is different):