Cannot read property 'forwardRef' of undefined

[Anjali99fusion]

Using ReactBigCalenar which has react Overlays as dependency.
React is included as external dependency in my webpack config. so, React.ForwardRef is defined in the browser but the error still appears.
Screenshot for reference 👍 : http://prntscr.com/pdcwgj

[taion]

this sounds like a bug in your webpack config, then