import { ProtocolConnection } from 'chrome-debugging-client';
import type { RaceCancellation } from 'race-cancellation';
export declare type WaitForMarkOrLCP = (raceCancellation: RaceCancellation) => Promise<void>;
export default function injectMarkObserver(page: ProtocolConnection, mark: string, variable?: string): Promise<WaitForMarkOrLCP>;
export declare function injectLCPObserver(page: ProtocolConnection, priorMarker?: string, variable?: string): Promise<WaitForMarkOrLCP>;
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