All properties for object unions weren't added to the adapter defaults.

Fixes #519

CHANGELOG.md

@@ -5,6 +5,12 @@ Headlines: Added, Changed, Deprecated, Removed, Fixed, Security
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+
+- All properties for object unions weren't added to the adapter defaults.
+
 ## [2.20.1] - 2024-11-15
 
 ### Changed

src/lib/jsonSchema/schemaDefaults.ts

@@ -70,7 +70,7 @@ function _defaultValues(schema: JSONSchema, isOptional: boolean, path: string[])
 		return _multiType.size > 1;
 	};
 
-	let output: Record<string, unknown> = {};
+	let output: Record<string, unknown> | undefined = undefined;
 
 	// Check unions first, so default values can take precedence over nullable and optional
 	if (!objectDefaults && info.union) {
@@ -98,6 +98,7 @@ function _defaultValues(schema: JSONSchema, isOptional: boolean, path: string[])
 
 			// Objects must have default values to avoid setting undefined properties on nested data
 			if (info.union.length && info.types[0] == 'object') {
+				if (output === undefined) output = {};
 				output =
 					info.union.length > 1
 						? merge.withOptions(
@@ -128,9 +129,9 @@ function _defaultValues(schema: JSONSchema, isOptional: boolean, path: string[])
 					: _defaultValues(objSchema, !info.required?.includes(key), [...path, key]);
 
 			//if (def !== undefined) output[key] = def;
+			if (output === undefined) output = {};
 			output[key] = def;
 		}
-		return output;
 	} else if (objectDefaults) {
 		return objectDefaults;
 	}
@@ -159,7 +160,7 @@ function _defaultValues(schema: JSONSchema, isOptional: boolean, path: string[])
 
 	const [formatType] = info.types;
 
-	return defaultValue(formatType, schema.enum);
+	return output ?? defaultValue(formatType, schema.enum);
 }
 
 function formatDefaultValue(type: SchemaType, value: unknown) {

src/tests/zodUnion.test.ts

@@ -0,0 +1,59 @@
+import { zod } from '$lib/adapters/zod.js';
+import { superValidate } from '$lib/superValidate.js';
+import { stringify } from 'devalue';
+import { describe, test } from 'vitest';
+import { z } from 'zod';
+
+const ZodSchema = z.object({
+	addresses: z.object({
+		additional: z.discriminatedUnion('type', [
+			z.object({
+				type: z.literal('poBox'),
+				name: z.string().min(1, 'min len').max(10, 'max len')
+			}),
+			z.object({
+				type: z.literal('none')
+			})
+		])
+	})
+});
+const FormSchema = zod(ZodSchema);
+type FormSchema = (typeof FormSchema)['defaults'];
+
+async function validate(data: unknown) {
+	const formInput = new FormData();
+
+	formInput.set('__superform_json', stringify(data));
+	try {
+		await superValidate(formInput, FormSchema);
+	} catch (err) {
+		console.error(err);
+		//
+		throw err;
+	}
+}
+
+describe('Demo', () => {
+	test('Bad', async () => {
+		const data = {
+			addresses: {
+				additional: {
+					type: 'poBox',
+					name: ''
+				}
+			}
+		} satisfies FormSchema;
+		await validate(data);
+	});
+
+	test('Good', async () => {
+		const data = {
+			addresses: {
+				additional: {
+					type: 'none'
+				}
+			}
+		} satisfies FormSchema;
+		await validate(data);
+	});
+});