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import type { HttpMetadata, WorkerStorage, WorkerStorageKV } from "../types/index";import { targets } from "esm-compat";import { fixedPkgVersions } from "./consts.ts";
export function hasTargetSegment(path: string) {  const parts = path.slice(1).split("/");  return parts.length >= 2 && parts.some((p) => targets.has(p));}
export function asKV(  storage?: R2Bucket | WorkerStorage,): WorkerStorageKV | undefined {  if (!storage) {    return undefined;  }  return globalThis.__AS_KV__ ?? (globalThis.__AS_KV__ = {    async getWithMetadata(      key: string,      _type: "stream",    ): Promise<      { value: ReadableStream | null; metadata: HttpMetadata | null }    > {      const ret = await storage.get(key);      if (ret === null) {        return { value: null, metadata: null };      }      return {        value: ret.body,        metadata: ret.customMetadata as HttpMetadata | undefined ?? null,      };    },    async put(      key: string,      value: ArrayBuffer | Uint8Array | ReadableStream,      options?: { metadata?: HttpMetadata },    ): Promise<void> {      await storage.put(key, value, { customMetadata: options?.metadata });    },  });}
export function fixPkgVersion(pkg: string, version: string) {  for (const [k, v] of Object.entries(fixedPkgVersions)) {    if (`${pkg}@${version}`.startsWith(k)) {      return v;    }  }  return version;}
export function trimPrefix(s: string, prefix: string): string {  if (prefix !== "" && s.startsWith(prefix)) {    return s.slice(prefix.length);  }  return s;}
export function splitBy(  s: string,  searchString: string,  fromLast = false,): [string, string] {  const i = fromLast ? s.lastIndexOf(searchString) : s.indexOf(searchString);  if (i >= 0) {    return [s.slice(0, i), s.slice(i + searchString.length)];  }  return [s, ""];}
/** create redirect response. */export function redirect(  url: URL | string,  status: 301 | 302,  cacheMaxAge = 600,) {  const headers = corsHeaders();  headers.set("Location", url.toString());  if (status === 301) {    headers.set("Cache-Control", "public, max-age=31536000, immutable");  } else {    headers.set(      "Cache-Control",      `public, max-age=${cacheMaxAge}`,    );  }  return new Response(null, { status, headers });}
export function err(message: string, status: number = 500) {  return new Response(    message,    { status, headers: corsHeaders() },  );}
export function errPkgNotFound(pkg: string) {  const headers = corsHeaders();  headers.set("Content-Type", "application/javascript; charset=utf-8");  headers.set("Cache-Control", "private, no-cache, no-store, must-revalidate");  return new Response(    [      `/* esm.sh - error */`,      `throw new Error("[esm.sh] " + "npm: package '${pkg}' not found");`,      `export default null;`,    ].join("\n"),    { status: 404, headers },  );}
export function checkPreflight(req: Request): Response | undefined {  if (req.method === "OPTIONS" && req.headers.has("Origin")) {    const headers = new Headers({      "Access-Control-Allow-Origin": "*",      "Access-Control-Allow-Methods": req.headers.get(        "Access-Control-Request-Method",      )!,      "Access-Control-Allow-Headers": req.headers.get(        "Access-Control-Request-Headers",      )!,    });    headers.append("Vary", "Origin");    headers.append("Vary", "Access-Control-Request-Method");    headers.append("Vary", "Access-Control-Request-Headers");    return new Response(null, { headers });  }  return void 0;}
export function corsHeaders() {  return new Headers({    "Access-Control-Allow-Origin": "*",    "Access-Control-Allow-Methods": "*",    "Vary": "Origin",  });}
export function copyHeaders(dst: Headers, src: Headers, ...keys: string[]) {  for (const k of keys) {    if (src.has(k)) {      dst.set(k, src.get(k)!);    }  }}
export async function hashText(s: string): Promise<string> {  const buffer = await crypto.subtle.digest(    "SHA-1",    new TextEncoder().encode(s),  );  return Array.from(new Uint8Array(buffer)).map((b) => b.toString(16).padStart(2, "0")).join("");}