vdl 0.1.6 

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export class ApiError extends Error {}

export async function api(method, path, body) {
  const init = { method };
  if (body !== undefined) {
    init.headers = { 'content-type': 'application/json' };
    init.body = JSON.stringify(body);
  }
  const res = await fetch(path, init);
  let data = null;
  try {
    data = await res.json();
  } catch {
    /* empty body */
  }
  if (!res.ok) {
    throw new ApiError((data && data.error) || `Request failed (${res.status})`);
  }
  return data;
}