declare type AnyConfig<T extends Record<string, any>, U extends Record<string, any>> = {
  [V in keyof U]: V extends keyof T
    ? U[V] extends (...args: any[]) => any
      ? (argv: T[V]) => T[V]
      : T[V]
    : U[V]
}
declare type CalculatedConfig<
  T extends Record<string, any>,
  U extends Record<string, any>
> = T &
  {
    [V in keyof U]: V extends keyof T ? T[V] : U[V]
  }
export default function mergeConfig<
  T extends Record<string, any>,
  U extends Record<string, any>
>(
  defaultConfig: T,
  ...configs: (AnyConfig<T, U> | null | undefined)[]
): CalculatedConfig<T, U>
export {}