Function normalizePage

packages/next/src/utils.ts:237–249

(page: string)

}

function normalizePage(page: string): string {
  // Resolve on anything that doesn't start with `/`
  if (!page.startsWith('/')) {
    page = `/${page}`;
  }

  // Replace the `/index` with `/`
  if (page === '/index') {
    page = '/';
  }

  return page;
}

export type Redirect = Omit<Rewrite, 'destination'> & {
  // Redirects can't target a service, so `destination` stays a plain string