validate

Adds a custom validator for the configuration field.

Validators are lambda functions that perform additional validation on the field's value. If the validation fails, the validator should throw an exception (typically IllegalArgumentException).

Multiple validators can be added by calling this method multiple times.

Example:

field(AppConfig::port)
    .validate { require(it > 0) { "Port must be positive" } }
    .validate { require(it < 65536) { "Port must be less than 65536" } }

Parameters