Validate Enum at a low level about typebox HOT 4 CLOSED

const A = Type.Object({ x: Type.Number(), y: Type.Number() })
const B = Type.Object({ x: Type.String(), y: Type.String() })
const C = Type.Object({ x: Type.Boolean(), y: Type.Boolean() })
const U = Type.Union([A, B, C])

// ...

const E = [...Value.Errors(U, { })] // no properties

// Current (top level only)
//
// [
//  { message: 'Expected union value', path: '' }
// ]
//
// -----
//
// Yielded sub variant errors (not supported)
// [
//  { message: 'Required property', path: '/x' },  // For variant A
//  { message: 'Required property', path: '/y' },
//  { message: 'Required property', path: '/z' },
//
//  { message: 'Required property', path: '/x' },  // For variant B (duplicated)
//  { message: 'Required property', path: '/y' },
//  { message: 'Required property', path: '/z' },
//
//  { message: 'Required property', path: '/x' },  // For variant C (duplicated)
//  { message: 'Required property', path: '/y' },
//  { message: 'Required property', path: '/z' },
//
//   ...
// ]

import { SetErrorFunction, DefaultErrorFunction } from '@sinclair/typebox/errors'
import { Type } from '@sinclair/typebox'
import { Value } from '@sinclair/typebox/value'

// Overrides the default error function to intercept schemas with 
// a errorMessage property. This enable you to assign specific
// errors to types and have them generate in error messages.
SetErrorFunction((param) => ('errorMessage' in param.schema) 
  ? param.schema.errorMessage
  : DefaultErrorFunction(param)
)

const Color = Type.Union([
  Type.Literal('Red'),
  Type.Literal('Blue'),
  Type.Literal('Green'),
], {
  errorMessage: "Expected either 'Red', 'Blue' or 'Green'"
})

// ...

const R = [...Value.Errors(Color, 'Orange')]

console.log(R) // [
               //   {
               //     type: 62,
               //     schema: {
               //       errorMessage: "Expected either 'Red', 'Blue' or 'Green'",
               //       anyOf: [Array],
               //     },
               //     path: '',
               //     value: 'Orange',
               //     message: "Expected either 'Red', 'Blue' or 'Green'"
               //   }
               // ]