Allow default values for empty strings

[zomars]

I'm trying to assign a default value when string is empty without any luck.

import { z } from "zod";

const stringWithDefault = z.string().optional().default("tuna")

const result = stringWithDefault.parse(""); // => Should be "tuna" instead is ""
//      ^ ?

console.log(result);

How could I achieve this?

const result = stringWithDefault.parse(undefined) // => returns "tuna"; 
const result = stringWithDefault.parse("") // => returns ""; 

Basically I want both cases to use the default value.

[rcnespoli]

Same issue here.

[zomars]

A workaround is using a transform:

const stringWithDefault = z.string().optional().transform((val) => val || "tuna")
const result = stringWithDefault.parse("") // => returns "tuna"; 

[rcnespoli]

Thanks. There is another issue related transform>

const stringToNumber = z.string().transform((val) => parseInt(val, 10))
const result = stringToNumber.parse("10") // Type 'string' is not assignable to type 'number'.

[colinhacks]

@zomars approach would be the recommended way to do this

const stringWithDefault = z.string().optional().transform((val) => val || "tuna")