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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
import { useEffect, useState } from "react";
// Tracks page visibility. New tabs are preloaded and render while hidden, so a
// one-shot effect on mount would spend itself before the user could see it.
export const usePageVisible = () => {
const [isPageVisible, setIsPageVisible] = useState(
typeof document === "undefined" || document.visibilityState === "visible"
);
useEffect(() => {
const onVisibility = () =>
setIsPageVisible(document.visibilityState === "visible");
document.addEventListener("visibilitychange", onVisibility);
return () => document.removeEventListener("visibilitychange", onVisibility);
}, []);
return isPageVisible;
};