z.input
When using zod with refinements like .refine, .transform or .preprocess, there are two available types of the schema, the input and output.
z.infer by default uses the output type.
The output is the schema after any effects.
The input is the schema before any effects.
ts
// Only apples are fruits. That's it.
const isValidFruit = (name: string) => name === "Apple";
const fruitSchema = z.object({
name: z.string().refine(isValidFruit),
});
// { name: string; }
type FruitInput = z.input<typeof fruitSchema>;
// { name: "Apple"; }
type FruitOutput = z.infer<typeof fruitSchema>;