/** `{ ok: true, data }` on `--json`, the human line otherwise. */
export declare function emitSuccess(json: boolean | undefined, data: unknown, text: string): void;
/**
 * `{ ok: false, error, code? }` on `--json`, the message on stderr otherwise.
 * Always marks the run failed — every call site in the playwright verbs is a
 * failure path.
 */
export declare function emitFailure(json: boolean | undefined, message: string, code?: string): void;