Function headersWith

telemetry-dashboard/src/index.ts:68–74

* Builds the response headers. Extras go through `new Headers(...)` rather than * an object spread: spreading a `Headers` instance silently yields `{}`, and * losing a `set-cookie` that way would be a very quiet bug.

(defaults: Record<string, string>, extra?: HeadersInit)

 * losing a `set-cookie` that way would be a very quiet bug.
 */
function headersWith(defaults: Record<string, string>, extra?: HeadersInit): Headers {
  const headers = new Headers(defaults);
  if (extra) {
    for (const [name, value] of new Headers(extra)) headers.set(name, value);
  }
  return headers;
}

function html(body: string, init: ResponseInit & { nonce?: string } = {}): Response {
  const { nonce, headers, ...rest } = init;