v1 The type after transition transform has changed

[yanskun]

import {
  object,
  string,
  optional,
  pipe,
  transform,
  InferOutput,
} from "valibot";

const SchemaA = object({
  key: pipe(
    optional(string()),
    transform((input) => (input === undefined ? "empty" : input)),
  ),
});
type SchemaAType = InferOutput<typeof SchemaA>;

const SchemaB = pipe(
  object({
    key: optional(string()),
  }),
  transform((input) => ({
    key: input.key === undefined ? "empty" : input.key,
  })),
);
type SchemaBType = InferOutput<typeof SchemaB>;

When defined as above

At 0.42.1, both were like SchemaBTyoe.
Is it a specification from v1 or a problem?

[fabian-hiller]

See #1095

[fabian-hiller]

Depending on your goal you can define a default value via the second argument of optional or replace optional with undefinedable.

[yanskun]

Thank you!

I didn't know about undefinedable. That's helpful.