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import { readableStreamFromReader } from "https://deno.land/std@0.136.0/streams/conversion.ts";import log from "../lib/log.ts";import type { AlephConfig } from "./types.ts";
export default {  fetch: async (req: Request): Promise<Response> => {    const config: AlephConfig | undefined = Reflect.get(globalThis, "__ALEPH_CONFIG");    const outputDir = config?.build?.outputDir ?? "dist";    const { pathname, searchParams } = new URL(req.url);    try {      let filePath = `./${outputDir}${pathname}`;      let ctype = "application/javascript; charset=utf-8";      if (searchParams.has("module") || pathname.startsWith("/-/esm.sh/")) {        filePath += `.js`;      }      if (pathname.endsWith(".css") && !searchParams.has("module")) {        ctype = "text/css; charset=utf-8";      }      const stat = await Deno.lstat(filePath);      if (stat.isFile) {        const { mtime } = stat;        const etag = mtime ? mtime.getTime().toString(16) + "-" + stat.size.toString(16) : null;        if (etag && req.headers.get("If-None-Match") === etag) {          return new Response(null, { status: 304 });        }        const file = await Deno.open(filePath, { read: true });        const headers = new Headers({ "Content-Type": ctype });        if (mtime) {          headers.set("Etag", etag!);          headers.set("Last-Modified", mtime.toUTCString());        }        return new Response(readableStreamFromReader(file), { headers });      }    } catch (err) {      if (!(err instanceof Deno.errors.NotFound)) {        log.error(err);        return new Response("Internal Server Error", { status: 500 });      }    }    return new Response("Not Found", { status: 404 });  },};