formkit-validation-helper · 
This helper utility creates a FormKit validation string or array from an object containing key/label pairs.
See the FormKit validation page regarding validating fields with the string or array syntax.
Usage
<script setup>
import { generateValidationString, generateValidationArray } from 'formkit-validation-helper';
const selectOptions = { dog: 'Dog', cat: 'Cat', mouse: 'Mouse' };
const validationString = generateValidationString(selectOptions); //=> 'dog,cat,mouse'
const validationArray = generateValidationArray(selectOptions); //=> ['dog', 'cat', 'mouse']
</script>
<template>
<FormKit
type="select"
name="first_animal"
label="Animal"
placeholder="Select first animal"
:options="selectOptions"
:validation="`required|is:${validationString}`"
/>
<!-- OR -->
<FormKit
type="select"
name="second_animal"
label="Animal"
placeholder="Select second animal"
:options="selectOptions"
:validation="[['required'], ['is', ...validationArray]]"
/>
</template>Note
Only uses the object keys and not the values.
{ dog: 'Dog', cat: 'Fox' } //=> 'dog,cat'