Zod 2 - parseAsync breaks unions of objects

import * as z from 'zod';

const Schema = z.union([
    z.object({
        ty: z.literal('A'),
    }),
    z.object({
        ty: z.literal('B'),
    }),
]);

(async () => {
  const obj = { ty: 'A' };
  console.log(Schema.parse(obj));  // Works
  console.log(await Schema.parseAsync(obj));  // Works with 1.11.10, breaks with 2.0.0-beta.21
})();

With Zod 2.0.0-beta.21, the parseAsync call fails with

{
  "code": "invalid_literal_value",
  "expected": "B",
  "path": [
    "ty"
  ],
  "message": "Input must be \"B\""
}

The objects wrapping the literals are important. A schema of z.union([z.literal('A'), z.literal('B')]) worked fine.

[colinhacks]

Looks like there were multiple bugs in play here. I fixed one problem with how objects get parsed but there was another issue with unions. I can confirm the original snippet now runs correctly with beta 25 (and it’s been added to the test suite!).

[colinhacks]

This is working for me on v2 beta 29. Are you sure you’re using the latest beta?

To answer your other question, I’m planning to skip v2 and release v3 into beta shortly. I recommend using v3 for your project, it’s as stable as v2 since very few changes were made. The only reason its a major version bump is because there are some breaking changes to transformers. v3 will be in beta for a short time (perhaps a month) before a general release.