toZod.ts

import { z, ZodObject, ZodTuple } from 'https://deno.land/x/zod/mod.ts'

export type ToZod<T> = T extends string
  ? z.ZodString
  : T extends number
  ? z.ZodNumber
  : T extends boolean
  ? z.ZodBoolean
  : T extends null
  ? z.ZodNull
  : T extends readonly any[]
  ? ZodTuple<{ -readonly [K in keyof T]: ToZod<T[K]> }>
  : T extends Record<string, any>
  ? ZodObject<{ [K in keyof T]: ToZod<T[K]> }>
  : z.ZodAny

export const toZod = <T>(obj: T): ToZod<T> => {
  if (typeof obj === 'string') return z.string() as ToZod<T>
  else if (typeof obj === 'number') return z.number() as ToZod<T>
  else if (typeof obj === 'boolean') return z.boolean() as ToZod<T>
  else if (obj === null) return z.null() as ToZod<T>
  else if (Array.isArray(obj))
    return z.tuple(obj.map(item => toZod(item))) as ToZod<T>
  else if (typeof obj === 'object')
    return z.object(
      Object.fromEntries(Object.entries(obj).map(([k, v]) => [k, toZod(v)])),
    ) as ToZod<T>
  else return z.any() as ToZod<T>
}