/**
 * @param {function} cb - called when a visibility change occurs with the vis state at that time
 * @param {boolean} [toHiddenOnly=false] - only execute the 'cb' when the vis is changing to the hidden state; no arg is passed to 'cb' if used
 * @returns void
 */
export function subscribeToVisibilityChange(cb: Function, toHiddenOnly?: boolean, capture: any, abortSignal: any): void;
export function subscribeToPageUnload(cb: any, capture: any, abortSignal: any): void;
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