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import { esbuild, extname, fromFileUrl } from "../deps.ts";import * as deno from "./deno.ts";import { mediaTypeToLoader, transformRawIntoContent } from "./shared.ts";
export interface LoadOptions {  importMapURL?: URL;}
export async function load(  url: URL,  _options: LoadOptions,): Promise<esbuild.OnLoadResult | null> {  switch (url.protocol) {    case "http:":    case "https:":    case "data:":      return await loadWithFetch(url);    case "file:": {      const res = await loadWithReadFile(url);      res.watchFiles = [fromFileUrl(url.href)];      return res;    }  }  return null;}
async function loadWithFetch(  specifier: URL,): Promise<esbuild.OnLoadResult> {  const specifierRaw = specifier.href;
  // TODO(lucacasonato): redirects!  const resp = await fetch(specifierRaw);  if (!resp.ok) {    throw new Error(      `Encountered status code ${resp.status} while fetching ${specifierRaw}.`,    );  }
  const contentType = resp.headers.get("content-type");  const mediaType = mapContentType(    new URL(resp.url || specifierRaw),    contentType,  );
  const loader = mediaTypeToLoader(mediaType);
  const raw = new Uint8Array(await resp.arrayBuffer());  const contents = transformRawIntoContent(raw, mediaType);
  return { contents, loader };}
async function loadWithReadFile(specifier: URL): Promise<esbuild.OnLoadResult> {  const path = fromFileUrl(specifier);
  const mediaType = mapContentType(specifier, null);  const loader = mediaTypeToLoader(mediaType);
  const raw = await Deno.readFile(path);  const contents = transformRawIntoContent(raw, mediaType);
  return { contents, loader };}
function mapContentType(  specifier: URL,  contentType: string | null,): deno.MediaType {  if (contentType !== null) {    const contentTypes = contentType.split(";");    const mediaType = contentTypes[0].toLowerCase();    switch (mediaType) {      case "application/typescript":      case "text/typescript":      case "video/vnd.dlna.mpeg-tts":      case "video/mp2t":      case "application/x-typescript":        return mapJsLikeExtension(specifier, "TypeScript");      case "application/javascript":      case "text/javascript":      case "application/ecmascript":      case "text/ecmascript":      case "application/x-javascript":      case "application/node":        return mapJsLikeExtension(specifier, "JavaScript");      case "text/jsx":        return "JSX";      case "text/tsx":        return "TSX";      case "application/json":      case "text/json":        return "Json";      case "application/wasm":        return "Wasm";      case "text/plain":      case "application/octet-stream":        return mediaTypeFromSpecifier(specifier);      default:        return "Unknown";    }  } else {    return mediaTypeFromSpecifier(specifier);  }}
function mapJsLikeExtension(  specifier: URL,  defaultType: deno.MediaType,): deno.MediaType {  const path = specifier.pathname;  switch (extname(path)) {    case ".jsx":      return "JSX";    case ".mjs":      return "Mjs";    case ".cjs":      return "Cjs";    case ".tsx":      return "TSX";    case ".ts":      if (path.endsWith(".d.ts")) {        return "Dts";      } else {        return defaultType;      }    case ".mts": {      if (path.endsWith(".d.mts")) {        return "Dmts";      } else {        return defaultType == "JavaScript" ? "Mjs" : "Mts";      }    }    case ".cts": {      if (path.endsWith(".d.cts")) {        return "Dcts";      } else {        return defaultType == "JavaScript" ? "Cjs" : "Cts";      }    }    default:      return defaultType;  }}
function mediaTypeFromSpecifier(specifier: URL): deno.MediaType {  const path = specifier.pathname;  switch (extname(path)) {    case "":      if (path.endsWith("/.tsbuildinfo")) {        return "TsBuildInfo";      } else {        return "Unknown";      }    case ".ts":      if (path.endsWith(".d.ts")) {        return "Dts";      } else {        return "TypeScript";      }    case ".mts":      if (path.endsWith(".d.mts")) {        return "Dmts";      } else {        return "Mts";      }    case ".cts":      if (path.endsWith(".d.cts")) {        return "Dcts";      } else {        return "Cts";      }    case ".tsx":      return "TSX";    case ".js":      return "JavaScript";    case ".jsx":      return "JSX";    case ".mjs":      return "Mjs";    case ".cjs":      return "Cjs";    case ".json":      return "Json";    case ".wasm":      return "Wasm";    case ".tsbuildinfo":      return "TsBuildInfo";    case ".map":      return "SourceMap";    default:      return "Unknown";  }}