.

Author: gsimone

packages/leva/src/plugins/Select/select-plugin.ts

@@ -1,7 +1,14 @@
 import type { SelectInput, InternalSelectSettings } from './select-types'
 import { z } from 'zod'
 
-const zValidPrimitive = z.union([z.string(), z.number(), z.boolean(), z.function()])
+// Use z.custom() for functions instead of z.function() to preserve function identity.
+// z.function() wraps values in zod proxies, changing their references.
+const zValidPrimitive = z.union([
+  z.string(),
+  z.number(),
+  z.boolean(),
+  z.custom<Function>((v) => typeof v === 'function'),
+])
 
 /**
  * Schema for the usecase

packages/leva/stories/inputs/Select.stories.tsx

@@ -1,7 +1,6 @@
 import React from 'react'
 import type { Meta, StoryObj } from '@storybook/react'
 import { expect, within, userEvent, waitFor } from 'storybook/test'
-import { vi } from 'vitest'
 
 import Reset from '../components/decorator-reset'