I was advised to find a well-maintained React library because well-maintained code tends to be more reliable.

My coworker found this React library: Idle Timer.

Here are the considerations we had when implementing a user logout feature for inactivity:

The user should be logged out if they remain inactive after being shown a modal warning. Multiple tabs must be synchronized. For example, if the user is active in one browser tab, they shouldn't be logged out just because another tab is idle. If the user's computer goes into sleep mode, JavaScript timers will pause. When the user returns, the system must detect if they've been away too long and either prompt them to refresh the page or automatically log them out, requiring them to log back in.