Save auth state

Returns storage state for this browser context, contains current cookies and local storage snapshot as a JSON object. This snapshot can be saved to the test context and used to restore the browser state later using the Load auth state step, or shared with other tests using module caching.

The JSON object returned by this step will conform to the following schema:

{
  cookies: CookieSetting[],
  origins: LocalStorageByOrigins[],
  idb: Record<string, IndexDbDump>,
}