Function noBrowser

frameworks/lit/web-test-runner.config.js:79–81

(b)

// Prepend BROWSERS=x,y to `npm run test` to run a subset of browsers
// e.g. `BROWSERS=chromium,firefox npm run test`
const noBrowser = (b) => {
  throw new Error(`No browser configured named '${b}'; using defaults`);
};
let commandLineBrowsers;
try {
  commandLineBrowsers = process.env.BROWSERS?.split(',').map(