How to start using data validation in kv?

import Post from '@/modules/post/model.ts'

import { setData, getData, listData, removeData } from '@/helpers/data.ts'

type PostParams = {
    blogSlug?: string
    postSlug?: string
    postInput?: Post
}

class PostRepository {
    static async createPost({ postInput, blogSlug }: PostParams) {
        const key = ['blog', blogSlug as string, 'post', postInput?.slug as string]
        const result = await setData({ key, value: postInput })
        if (result.ok) return await getData({ key })
    }

    static async listPosts({ blogSlug }: PostParams) {
        const prefix = ['blog', blogSlug as string, 'post']
        return await listData({ prefix })
    }

    static async showPost({ blogSlug, postSlug }: PostParams) {
        const key = ['blog', blogSlug as string, 'post', postSlug as string]
        return await getData({ key })
    }

    static async updatePost({ postInput, blogSlug, postSlug }: PostParams) {
        const key = ['blog', blogSlug as string, 'post', postSlug as string]
        return await setData({ key, value: postInput })
    }

    static async deletePost({ blogSlug, postSlug }: PostParams) {
        const key = ['blog', blogSlug as string, 'post', postSlug as string]
        await removeData({ key })
    }
}

export default PostRepository