/**
 * Preflight Playwright Chromium binary install.
 *
 * Run before any `chromium.launch(...)` to make sure the Playwright Chromium
 * binary exists on disk. The package ships a `postinstall` hook that fetches
 * Chromium at install time, but that step can be silently skipped on some
 * setups (CI caches, monorepos, npm scripts) — and any Playwright version
 * bump downstream invalidates the existing binary too. Catching this once at
 * run start avoids the famously confusing "Executable doesn't exist at …"
 * launch failure mid-capture.
 *
 * Cross-platform: uses `npx playwright install chromium` (works on macOS,
 * Linux, Windows). Output is streamed inherit so the user sees the
 * download progress.
 */
export declare function ensureChromiumInstalled(): Promise<void>;