ZodCatch Rethrow

[samchungy]

I was working on my library: https://github.com/samchungy/zod-openapi and was trying to simplify how I determine if a schema should be "required".

ZodCatch I initially thought I could handle as if nothing happened, however, it seems to accept undefined which makes it technically optional. I believe consumers should be able to mark this as a required schema since we have .default() to be able to handle undefined values.

I think it would be helpful for consumers to be able to catch the error, and to rethrow/or return a ZodError if they think it should be still flagged as invalid.

eg.

const schema = z.string().min(1).catch((ctx) => {
  if (ctx.input === undefined) {
    throw ctx.error;
  }
  return 'foo'
})

schema.safeParse(undefined); // Does not throw
schema.isOptional() // false

It would be akin to z.string().optional() with .refine() but your input boundary would be introspectable as non optional