Empty string or number

I have this type that I want to reuse:

const number = type("string")
  .pipe((s) => s || "0")
  .to("string.numeric.parse");

const number = type("string")
  .pipe((s) => s || "0")
  .to("string.numeric.parse");

I want to reuse it so if the string is empty, leave it as is, otherwise parse it as the number type. But when I do this, it complains:

type("''").or(number); // An unordered union of a type including a morph and a type with overlapping input is indeterminate

type("''").or(number); // An unordered union of a type including a morph and a type with overlapping input is indeterminate

This works though, so it's no big deal but just curious if it's possible to combine these above?

type("''").or("string.numeric.parse");

type("''").or("string.numeric.parse");

10 Replies

ciscoheatOP•2w ago

I also have a currency type that I may want to apply the same logic to:

type("string | number").pipe((s) => currency(s))

type("string | number").pipe((s) => currency(s))

But same problem there. It could be solved in the pipe function, but it would be nice to just be able to add an empty string type to another type, to avoid rewriting functions.

🌺🇫🇷 Shigu :3 🌺•2w ago

why not apply the number type through another pipe? ie:

type("string").pipe((s) => s.length !== 0 ? number(s) : "");

type("string").pipe((s) => s.length !== 0 ? number(s) : "");

if you want you could put the code adding the pipe into a function and use that instead

ciscoheatOP•2w ago

That works, but I'd like to be able, if possible, to use a type directly so it can be easily chained to existing types

ssalbdivad•2w ago

The key is with overlapping input. You just have to make sure if one branch of the union contains a transform, we can tell they have no overlap:

// make the string non-empty to remove the overlap
const number = type("string > 0")
    .pipe(s => s || "0")
    .to("string.numeric.parse")

// now works fine
number.or("''")

// make the string non-empty to remove the overlap
const number = type("string > 0")
    .pipe(s => s || "0")
    .to("string.numeric.parse")

// now works fine
number.or("''")

In this case I don't think the pipe would ever apply, but hopefully that concept is helpful Or rather, the pipe would never do anything since s will always be truthy

ciscoheatOP•2w ago

Makes sense, thank you! Just started up a Deno project and used Arktype for CSV -> object validation, so incredibly convenient. Thank you again ☺️

ssalbdivad•2w ago

Glad it's been going well! Still have so much I want to build + document

ciscoheatOP•2w ago

Yeah, I'd love to use the JSON Schema feature to improve the adapter for Superforms

ssalbdivad•2w ago

Close on that one and I'm really happy with the API

ssalbdivad•2w ago

Basically you can handle each incompatibility individually or apply a fallback to all of them at once

ciscoheatOP•2w ago

Ohh, great Looking forward to that one!

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Empty string or number

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