I have a simple ReactJS app based on hooks (no classes) using StrictMode. 

I am using React version 16.13.1 and Material-UI version 4.9.10.

In the Appbar I am using Drawer. 

        &lt;div className={classes.root}&gt;
            &lt;AppBar position=&quot;static&quot;&gt;
                &lt;Toolbar&gt;
                    &lt;IconButton
                        edge=&quot;start&quot;
                        className={classes.menuButton}
                        color=&quot;inherit&quot;
                        aria-label=&quot;menu&quot;
                        onClick={handleDrawerOpen}&gt;
                        &lt;MenuIcon /&gt;
                    &lt;/IconButton&gt;
                    &lt;Typography variant=&quot;h6&quot; className={classes.title}&gt;
                        Online Information
                    &lt;/Typography&gt;
                &lt;/Toolbar&gt;
            &lt;/AppBar&gt;
            &lt;Drawer
                variant=&quot;persistent&quot;
                anchor=&quot;left&quot;
                open={open}
            &gt;&lt;/Drawer&gt;
        &lt;/div&gt;

I notice that when I open the Drawer, I get the following warning.

    Warning: findDOMNode is deprecated in StrictMode. findDOMNode was passed an instance 
    of 
    Transition which is inside StrictMode. Instead, add a ref directly to the element you 
    want to reference. Learn more about using refs safely ....
    in div (created by Transition)
    in Transition (created by ForwardRef(Fade))
    in ForwardRef(Fade) (created by ForwardRef(Backdrop))
    in ForwardRef(Backdrop) (created by WithStyles(ForwardRef(Backdrop)))
    in WithStyles(ForwardRef(Backdrop)) (created by ForwardRef(Modal))
    in div (created by ForwardRef(Modal))
    in ForwardRef(Portal) (created by ForwardRef(Modal))
    in ForwardRef(Modal) (created by ForwardRef(Drawer))
    in ForwardRef(Drawer) (created by WithStyles(ForwardRef(Drawer)))
I found some reference on the web for this issue but still can’t figure out how to resolve this issue.

Can someone please add some workaround for this problem?

Thank you 


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material-ui Drawer - findDOMNode is deprecated in StrictMode