Function fetchJson

next/lib/useSession.ts:8–19

(
  input: RequestInfo,
  init?: RequestInit,
)

const sessionApiRoute = '/session'

async function fetchJson<JSON = unknown>(
  input: RequestInfo,
  init?: RequestInit,
): Promise<JSON> {
  return fetch(input, {
    headers: {
      accept: 'application/json',
      'content-type': 'application/json',
    },
    ...init,
  }).then((res) => res.json())
}

function doLogin(url: string, { arg }: { arg: string }) {
  return fetchJson<SessionData>(url, {