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fix: discriminated union for Zod v4 mini #784

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Merged
jorisre merged 1 commit into from
Jul 29, 2025
Merged

fix: discriminated union for Zod v4 mini #784

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14 changes: 14 additions & 0 deletions zod/src/__tests__/__fixtures__/data-v4-mini.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,15 @@ export const schema = z
message: 'Invalid date',
}),
),
auth: z.discriminatedUnion('type', [
z.object({
type: z.literal('registered'),
passwordHash: z.string(),
}),
z.object({
type: z.literal('guest'),
}),
]),
})
.check(
z.refine((obj) => obj.password === obj.repeatPassword, {
Expand All @@ -68,6 +77,10 @@ export const validData = {
},
],
dateStr: '2020-01-01',
auth: {
type: 'registered',
passwordHash: 'hash',
},
} satisfies z.input<typeof schema>;

export const invalidData = {
Expand All @@ -76,6 +89,7 @@ export const invalidData = {
birthYear: 'birthYear',
like: [{ id: 'z' }],
url: 'abc',
auth: { type: 'invalid' },
} as unknown as z.input<typeof schema>;

export const fields: Record<InternalFieldName, Field['_f']> = {
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2 changes: 1 addition & 1 deletion zod/src/zod.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -91,7 +91,7 @@ function parseZod4Issues(
const _path = path.join('.');

if (!errors[_path]) {
if (error.code === 'invalid_union') {
if (error.code === 'invalid_union' && error.errors.length > 0) {
const unionError = error.errors[0][0];

errors[_path] = {
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