/**
 * Polls `http://localhost:<port>/` until it answers or `timeoutMs` elapses. Shared by `verify`
 * (waiting on its throwaway vite instance) and `dev` (announcing its own once it's ready) — kept
 * dependency-free so importing it doesn't pull playwright-core into `dev`, which never touches a
 * browser.
 */
export declare function waitForServer(port: number, timeoutMs: number): Promise<void>;
/**
 * Confirm the server answering on `port` is serving THIS project, not some other one.
 *
 * `waitForServer` proves something answered; it cannot prove it was the vite this run spawned.
 * When another project's dev server holds the same port on the other loopback family, our own
 * vite dies on `--strictPort` a beat AFTER the first poll already got a 200 from the neighbour —
 * and the run then measures, screenshots and grades a different game, reporting success for one
 * it never loaded. Every scaffolded project serves its `bitmagic.json` from its vite root, so the
 * `gameId` in it is the identity check: cheap, and wrong only when the server really is wrong.
 */
export declare function assertServesGame(port: number, gameId: string): Promise<void>;