I am writing a simple wrapper around fetch.

async function apiCall(
  endpoint: string,
  {
    data,
    headers: customHeaders,
    ...customConfig
  }: { data?: Object; headers?: Object } = {}
) {
  const config = {
    method: data ? 'POST' : 'GET',
    body: data ? JSON.stringify(data) : undefined,
    headers: {
      'content-type': data ? 'application/json' : undefined,
      ...customHeaders,
    },
    ...customConfig,
  }

  return fetch(endpoint, config as any).then(async (response) => {
    if (response.ok) {
      const json = await response.json() //