next-app.ts

type Params<T = Record<string, string>> = T

type SearchParams<T = Record<string, string | string[] | undefined>> = T

interface PageProps<P, S> {
  params: Params<P>
  searchParams: SearchParams<S>
}

interface LayoutProps<P> {
  children: React.ReactNode
  params?: Params<P>
}

export interface Page<T = Params, S = SearchParams> extends React.FC<PageProps<T, S>> {}

export interface Layout<T = Params> extends React.FC<LayoutProps<T>> {}