Add prefix key to an object but excluding some parameters

prefixExamples.ts

type PrefixKey<T, Prefix extends string> = {
  [K in keyof T as `${Prefix}_${string & K}`]: T[K]
}

type OmitPrefixed<
  T,
  Prefix extends string,
  Keys extends Extract<keyof T, string>
> = {
  [K in keyof T as K extends Keys ? never : `${Prefix}_${string & K}`]: T[K]
}

type AddPrefixExcept<
  T,
  Prefix extends string,
  Keys extends Extract<keyof T, string>
> = OmitPrefixed<T, Prefix, Keys> & {
  [K in Keys]: T[K] extends string ? `${Prefix}_${T[K]}` : T[K]
}