Function createMetadata

packages/unpkg-esm/src/request-handler.ts:239–279

(
  env: Env,
  origin: string,
  packageName: string,
  version: string,
  filename: string | undefined,
  packageJson: PackageJson,
  searchParams: URLSearchParams
)

}

async function createMetadata(
  env: Env,
  origin: string,
  packageName: string,
  version: string,
  filename: string | undefined,
  packageJson: PackageJson,
  searchParams: URLSearchParams
): Promise<Metadata | { response: Response }> {
  let subpath = getEsmPackageSubpath(filename);
  let target = searchParams.get("target") ?? "es2022";
  let artifactSearchParams = new URLSearchParams(searchParams);
  artifactSearchParams.delete("meta");
  let artifactSearch = normalizeSearch(artifactSearchParams);
  let modulePath = `/${packageName}@${version}${filename ?? ""}${artifactSearch}`;
  let module = new URL(modulePath, origin).toString();
  let types = getPackageTypesUrl(origin, packageName, version, filename, packageJson);
  let integrity = await getBuildIntegrity(env, origin, packageName, version, filename, artifactSearchParams);
  if ("response" in integrity) {
    return integrity;
  }

  return {
    name: packageName,
    version,
    specifier: `${packageName}@${version}`,
    subpath,
    target,
    module,
    types,
    integrity: integrity.value,
    dependencies: packageJson.dependencies ?? {},
    peerDependencies: packageJson.peerDependencies ?? {},
    exports: listExportSubpaths(packageJson),
    build: {
      bundle: searchParams.has("standalone") ? "standalone" : searchParams.has("bundle") ? "bundle" : "smart",
      minify: searchParams.has("min"),
      sourcemap: searchParams.has("sourcemap"),
    },
  };
}

async function getBuildIntegrity(
  env: Env,