/**
 * Starts tracking the Cumulative Layout Shift on the current page and collects the value once
 *
 * - the page visibility is hidden
 * - a navigation span is started (to stop CLS measurement for SPA soft navigations)
 *
 * Once either of these events triggers, the CLS value is sent as a standalone span and we stop
 * measuring CLS.
 */
export declare function trackClsAsStandaloneSpan(): void;
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