Warning: findDOMNode is deprecated in StrictMode. findDOMNode was passed an instance of Transition which is inside StrictMode

The setState call looks like it’s being written to the wrong place. Make sure it’s on the editTodo object:

    handleChange = (event) => {
        this.setState(state => ({
          editTodo: {
            ...state.editTodo,
            title: event.target.value,
          },
        }));
    }

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