export interface OnHiddenCallback {
    (event: Event): void;
}
/**
 * Sentry-specific change:
 *
 * This function's logic was NOT updated to web-vitals 4.2.4 or 5.x but we continue
 * to use the web-vitals 3.5.2 version due to having stricter browser support.
 *
 * PR with context that made the changes:
 * https://github.com/GoogleChrome/web-vitals/pull/442/files#r1530492402
 *
 * The PR removed listening to the `pagehide` event, in favour of only listening to
 * the `visibilitychange` event. This is "more correct" but some browsers we still
 * support (Safari <14.4) don't fully support `visibilitychange` or have known bugs
 * with respect to the `visibilitychange` event.
 *
 * TODO (v11): If we decide to drop support for Safari 14.4, we can use the logic
 * from web-vitals 4.2.4. In this case, we also need to update the integration tests
 * that currently trigger the `pagehide` event to simulate the page being hidden.
 *
 * @param {OnHiddenCallback} cb - Callback to be executed when the page is hidden or unloaded.
 *
 * @deprecated use `whenIdleOrHidden` or `addPageListener('visibilitychange')` instead
 */
export declare const onHidden: (cb: OnHiddenCallback) => void;
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