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// @ts-check
import { getFreePort } from "free_port/mod.ts";import { Status, STATUS_TEXT } from "std/http/http_status.ts";import { serve } from "std/http/server.ts";
import publicFileResponse from "../publicFileResponse.mjs";
const publicDir = new URL("../", import.meta.url);
/** * Serves the files of this project on a free port so the modules can be * imported and tested in a headless browser environment. * @param {AbortSignal} [signal] Abort signal to close the file server. * @returns {Promise<{ port: number, close: Promise<void> }>} Port the file *   server is listening on, and a promise that resolves once the server closes. */export default async function serveProjectFiles(signal) {  if (signal !== undefined && !(signal instanceof AbortSignal)) {    throw new TypeError(      "Argument 1 `signal` must be an `AbortSignal` instance.",    );  }
  const port = await getFreePort(3000);
  return {    port,    close: serve(      async (request) => {        try {          return await publicFileResponse(            request,            publicDir,            customizeResponseInit,          );        } catch (error) {          const headers = new Headers();          return new Response(            null,            await customizeResponseInit(              request,              error instanceof Deno.errors.NotFound                ? {                  status: Status.NotFound,                  statusText: STATUS_TEXT[Status.NotFound],                  headers,                }                : {                  status: Status.InternalServerError,                  statusText: STATUS_TEXT[Status.InternalServerError],                  headers,                },            ),          );        }      },      { port, signal },    ),  };}
/** @type {NonNullable<Parameters<publicFileResponse>[2]>} */function customizeResponseInit(_request, responseInit) {  responseInit.headers.set("access-control-allow-origin", "*");  return responseInit;}