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export function json(data: unknown, init?: ResponseInit): Response {  const headers = new Headers(init?.headers);  headers.append("content-type", "application/json; charset=utf-8");  return new Response(JSON.stringify(data), { ...init, headers });}
export type CacheControlOptions = {  maxAge?: number;  sMaxAge?: number;  public?: boolean;  private?: boolean;  immutable?: boolean;  mustRevalidate?: boolean;};
export function content(  body: BodyInit,  init?: ResponseInit & {    contentType?: string;    cacheControl?: CacheControlOptions | "immutable" | "no-cache";  },): Response {  const headers = new Headers(init?.headers);
  const contentType = init?.contentType;  if (contentType) {    headers.set("Content-Type", contentType);  }
  const cacheControl = init?.cacheControl;  if (cacheControl) {    if (cacheControl === "no-cache") {      headers.set("Cache-Control", "no-cache, no-store, must-revalidate");    } else if (cacheControl === "immutable") {      headers.set("Cache-Control", "public, max-age=31536000, immutable");    } else {      const { maxAge, sMaxAge, immutable, mustRevalidate } = cacheControl;      headers.set(        "Cache-Control",        [          cacheControl.public && "public",          cacheControl.private && "private",          maxAge && `max-age=${maxAge}`,          sMaxAge && `s-maxage=${sMaxAge}`,          immutable && "immutable",          mustRevalidate && "must-revalidate",        ].filter(Boolean).join(", "),      );    }  }
  return new Response(body, { ...init, headers });}