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import type { Middleware } from "../core/server.ts";
export interface Options {  redirects: Record<string, string | Redirect>;}
export interface Redirect {  to: string;  code: 301 | 302 | 303 | 307 | 308 | 200;}
/** Implements redirects */export default function redirects(options: Options): Middleware {  const redirects = new Map<string, Redirect>();
  for (const [from, to] of Object.entries(options.redirects)) {    redirects.set(from, buildRedirects(to));  }
  return async (request, next) => {    const url = new URL(request.url);    const redirect = redirects.get(url.pathname) || redirects.get(url.href);
    if (!redirect) {      return await next(request);    }
    switch (redirect.code) {      case 301:      case 302:      case 307:      case 308:        return new Response(null, {          status: redirect.code,          headers: {            location: redirect.to,          },        });
      case 200:        url.pathname = redirect.to;        request = new Request(url.href, {          ...request,        });    }
    return await next(request);  };}
function buildRedirects(redirect: string | Redirect): Redirect {  if (typeof redirect === "string") {    return {      to: redirect,      code: 301,    };  }
  return redirect;}