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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import type { LoadResponse } from "./types.d.ts";
const hasPermissions = "permissions" in Deno;let readRequested = false;const netRequested = new Set<string>();
async function requestRead(path: URL): Promise<void> {  if (readRequested || !hasPermissions) {    return;  }  readRequested = true;  await Deno.permissions.request({ name: "read", path });}
async function requestNet(host: string): Promise<void> {  if (!hasPermissions || netRequested.has(host)) {    return;  }  netRequested.add(host);  await Deno.permissions.request({ name: "net", host });}
/** A Deno specific loader function that can be passed to the * `createModuleGraph` which will use `Deno.readTextFile` for local files, or * use `fetch()` for remote modules. * * @param specifier The string module specifier from the module graph. */export async function load(  specifier: string,): Promise<LoadResponse | undefined> {  const url = new URL(specifier);  try {    switch (url.protocol) {      case "file:": {        await requestRead(url);        const content = await Deno.readTextFile(url);        return {          kind: "module",          specifier,          content,        };      }      case "http:":      case "https:": {        await requestNet(url.host);        const response = await fetch(String(url), { redirect: "follow" });        if (response.status !== 200) {          // ensure the body is read as to not leak resources          await response.arrayBuffer();          return undefined;        }        const content = await response.text();        const headers: Record<string, string> = {};        for (const [key, value] of response.headers) {          headers[key.toLowerCase()] = value;        }        return {          kind: "module",          specifier: response.url,          headers,          content,        };      }      default:        return undefined;    }  } catch {    return undefined;  }}