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React has deprecated isMounted() and recommends migrating this way:
An easy migration strategy for anyone upgrading their code to avoid isMounted() is to track the mounted status yourself. Just set a _isMounted property to true in componentDidMount and set it to false in componentWillUnmount, and use this variable to check your component’s status.
https://reactjs.org/blog/2015/12/16/ismounted-antipattern.html
This also fixes the console warning thrown by React about the deprecated isMounted()