ohif-viewer/platform/ui/src/contextProviders/ImageViewerProvider.jsx

import React, { createContext, useContext, useReducer, useMemo } from 'react';

// export const IMAGE_VIEWER_DEFAULT_VALUE = {
//   StudyInstanceUIDs: [],
//   setImageViewer: () => {},
// };

export const ImageViewerContext = createContext();

export function ImageViewerProvider({
  StudyInstanceUIDs,
  reducer,
  initialState,
  children,
}) {
  const value = useMemo(() => {
    return { StudyInstanceUIDs };
  }, [StudyInstanceUIDs]);

  return (
    <ImageViewerContext.Provider value={value}>
      {children}
    </ImageViewerContext.Provider>
  );
}

export const useImageViewer = () => useContext(ImageViewerContext);