InferNonNullishOutput

// Create nullish sting schema
const NullishStringSchema = v.nullish(
  v.pipe(
    v.string(),
    v.transform((input) => input.length)
  )
);

// Infer non nullish string output type
type NonNullishStringOutput = v.InferNonNullishOutput<
  typeof NullishStringSchema
>; // number