arktype•2w ago

is there a mustNotBe

currently I am using this as a workaround but I'd rather not implement the (was actual) part myself I would like maybe a mustNotBe or maybe a problem variant that doesn't overwrite the was stuff in the error string

const formSchema = type({
    name: type('string.trim').narrow((name, ctx) => {
        if (!name.endsWith('.project')) return true;
        return ctx.reject({
            problem: `cannot end with .project (was "${name}")`
        });
    }),
    id: type('string | undefined').pipe((v) => v ?? nanoid()),
    parentId: type('string')
});

const formSchema = type({
    name: type('string.trim').narrow((name, ctx) => {
        if (!name.endsWith('.project')) return true;
        return ctx.reject({
            problem: `cannot end with .project (was "${name}")`
        });
    }),
    id: type('string | undefined').pipe((v) => v ?? nanoid()),
    parentId: type('string')
});

Thanks for any help 🙂

9 Replies

ssalbdivad•2w ago

Hmm, I think the best way to make it composable would be to try and find a way to fit into must be ___. In a lot of cases, it wasn't the first thing I thought of but I found a reasonable way to make it work for various messages. In this case, maybe something like ctx.mustBe("a string not ending in .project") or similar

Raqueebuddin AzizOP•2w ago

Thats what I thought as well but "a string" isnt a nice message for like showing form errors for example sicne most people wouldn't know what a string is

ssalbdivad•2w ago

"non-project suffixed"

Raqueebuddin AzizOP•2w ago

And error summaries in ark already so good that they can be show verbatim on a form so I'd rather not implement custom formatters just for this case

ssalbdivad•2w ago

Yeah, the problem is the way it composes though that's why generally it's valuable to use must be ___ Because if some errors are must not be it adds a ton of complexity to the logic for union messages So you might be stuck between a rock and hard place in terms of a creative solution for the positive version or having to respecify actual

Raqueebuddin AzizOP•2w ago

Got it, thanks for the insights

ssalbdivad•2w ago

Sorry I don't have a better answer! Hopefully you find something acceptable

Raqueebuddin AzizOP•2w ago

Yeah I think interpolating actual isnt that bad, just kinda annoying

ssalbdivad•2w ago

not ending in .project or ending in something other than .project I don't know lol maybe there's something good out there

Gaming

Programming

is there a mustNotBe

Did you find this page helpful?