message: Don't allow relative urls at CLI time.
diff: @@ -36,12 +36,10 @@ import { runPlain } from '../run';
  import ESLintPlugin from 'eslint-webpack-plugin';
  import pickBy from 'lodash/pickBy';
  -const NO_OP_URL = 'http://test-site-asdf.org';
  -
  export function resolveBaseUrl(config: Config): URL {
  const baseUrl = config.getString('app.baseUrl');
  try {
  - return new URL(baseUrl, NO_OP_URL);
  + return new URL(baseUrl);
  } catch (error) {
  throw new Error(`Invalid app.baseUrl, ${error}`);
  }
  @@ -90,7 +88,7 @@ export async function createConfig(
  const externalPkgs = packages.filter(p => !isChildPath(paths.root, p.dir));
  const baseUrl = frontendConfig.getString('app.baseUrl');
  - const validBaseUrl = new URL(baseUrl, NO_OP_URL);
  + const validBaseUrl = new URL(baseUrl);
  const publicPath = validBaseUrl.pathname.replace(/\/$/, '');
  if (checksEnabled) {
  plugins.push(
  