monitor.isDragging() throws error in collect function

Describe the bug Hello, banging my head around this problem for half of the day already. Any help very appreciated

monitor.isDragging() throws error

My DragSource looks like that

const ResizeHandler = DragSource(
    "RESIZE_TYPE",
    {
        beginDrag: ({id}) => ({id}),
        endDrag: (props, monitor) => {
            console.log(props, monitor.getDifferenceFromInitialOffset().x);
        },
    },
    (connectDnd, monitor) => ({
        connectDragSource: connectDnd.dragSource(),
        isDragging: monitor.isDragging(), // fatal here
    }),
)(({isDragging, connectDragSource}: {isDragging: boolean, connectDragSource: Function}) => (
    connectDragSource(
        <div
            className={styles.resizeHandler}
            style={{
                background: isDragging ? `blue` : null,
            }}
        />,
    )
));

And at the moment of calling monitor.isDragging() everything fails as it doesn’t have sourceId (equals to null).

Context is created by using DragDropContext(backend) and for backend is used some extended version of https://github.com/zyzo/react-dnd-mouse-backend

Expected behavior monitor.isDragging() should work without exceptions

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: Mac OS 10.14.3
• Browser: chrome 72.0.3626.121 (Official Build) (64-bit)
• Version: 7.3.1

Additional context Add any other context about the problem here.

Thanks in advance

[darthtrevino]

Oh right, that’s a known issue. I’ll spend some time on that today

On Mon, Mar 11, 2019, 9:39 AM Mikhail Yermolayev [e-mail] wrote:

Currently I’m away of my laptop. Will try later One more thing to note: Everything works when I use Ref Callbacks. But when I pass ref from createRef API or useRef - it throws fatal

— You are receiving this because you were assigned. Reply to this email directly, view it on GitHub https://github.com/react-dnd/react-dnd/issues/1262#issuecomment-471619550, or mute the thread https://github.com/notifications/unsubscribe-auth/AAG7iOVUTFRCeL07KRgsG5U7TNPKHT0Kks5vVoavgaJpZM4boyji .

[darthtrevino]

What a PITA, I’m glad you found the issue though. Thanks @MikeYermolayev !