User state types and validations

[idoros]

pseudo classes with parameters offers a number of built-in types and validations for the argument input of the pseudo-class:

.root {
    -st-states: size( enum(small, medium, large) )
                      fieldName( 
                          string("^user-", maxLength(10) )
                      );
}

We would like to add the ability to extend the parameter system and add custom user types and validations.

:import {
    -st-from: "./user-types.ts";
    -st-named: languageType;
}
.root {
    -st-states: lang( languageType);
}

.root:lang(en) {
    /* will give warnings for unknown language strings 
    and transform the selector into a native selector */
}

To Do: add details of what such a user type extension interface looks like, build in optional validations and options, custom transform...

[idoros]

may revisit in the future, but closing for now