import { zfd } from 'zod-form-data'

const validationSchema = zfd.formData({
  isBoolean: zfd.checkbox(),
});

console.log(
  validationSchema.parse({
    isBoolean: true,
  })
);

ZodError: [
  {
    "code": "invalid_union",
    "errors": [
      [
        {
          "code": "invalid_value",
          "values": [
            "on"
          ],
          "path": [],
          "message": "Invalid input: expected \"on\""
        }
      ],
      [
        {
          "code": "invalid_value",
          "values": [
            null
          ],
          "path": [],
          "message": "Invalid input: expected undefined"
        }
      ]
    ],
    "path": [
      "isBoolean"
    ],
    "message": "Invalid input"
  }
]