fix(zui): no dupplicated titles in nullable json-schema

zui/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@bpinternal/zui",
-  "version": "1.2.1",
+  "version": "1.2.2",
   "description": "A fork of Zod with additional features",
   "type": "module",
   "source": "./src/index.ts",

zui/src/transforms/zui-to-json-schema/index.test.ts

@@ -2,6 +2,9 @@ import * as errs from '../common/errors'
 import z from '../../z'
 import { describe, test, expect } from 'vitest'
 import { toJSONSchema } from './index'
+import { JSONSchema7 } from 'json-schema'
+
+const asJsonSchema7 = <T extends JSONSchema7>(schema: T): T => schema
 
 describe('zuiToJSONSchemaNext', () => {
   test('should map ZodString to StringSchema', () => {
@@ -374,4 +377,21 @@ describe('zuiToJSONSchemaNext', () => {
     const schema = toJSONSchema(z.ref('foo'))
     expect(schema).toEqual({ $ref: 'foo' })
   })
+
+  test('should preserve title and description of nullable schemas', () => {
+    const title = 'My Title'
+    const description = 'My Description'
+    const expected = asJsonSchema7({
+      anyOf: [{ type: 'string', description, 'x-zui': { title: title } }, { type: 'null' }],
+      'x-zui': {
+        def: { typeName: 'ZodNullable' },
+      },
+    })
+
+    const schema1 = toJSONSchema(z.string().nullable().title(title).describe(description))
+    expect(schema1).toEqual(expected)
+
+    const schema2 = toJSONSchema(z.string().title(title).describe(description).nullable())
+    expect(schema2).toEqual(expected)
+  })
 })

zui/src/transforms/zui-to-json-schema/index.ts

@@ -221,7 +221,7 @@ export function toJSONSchema(schema: z.Schema): json.Schema {
       return {
         anyOf: [toJSONSchema(def.innerType), nullSchema()],
         'x-zui': {
-          ...def['x-zui'],
+          // ...def['x-zui'],
           def: { typeName: z.ZodFirstPartyTypeKind.ZodNullable },
         },
       } satisfies json.NullableSchema