import { ErrorContext } from '../errorReporting';

// A deliberate throw, reachable only from the dev server. Every mount site
// guards it with `import.meta.env.DEV &&`, which Vite replaces with `false` in
// a production build so Rollup drops both the element and this module.
//
// The marker is in the thrown message so a production bundle can be grepped for
// it. A gate that is silently always-off looks identical to one that works, so
// this is checked rather than trusted — the same reasoning as #61's coverage
// instrumentation gate.
export const DEV_THROW_MARKER = '__DEV_THROW_BOUNDARY__';

export default function DevThrow({ scope }: Readonly<{ scope: ErrorContext }>) {
  const requested = new URLSearchParams(window.location.search).get('boom');
  if (requested === scope) {
    throw new Error(`${DEV_THROW_MARKER} deliberate throw in ${scope}`);
  }
  return null;
}