Add styled-components to Codepen

Question

Try to use styled-components in my pen https://codepen.io/mxshrv/pen/aMXvQd, but get error

Cannot use 'in' operator to search for 'default' in undefined

styled is not defined

How to add a library correctly for my pen?

Answer 1

Looks like Styled Components v5 has added a new requirement. You now also need react-is to be able to use SC.

So in your pen, under external scripts, search for react-is and add it.

I would also recommend moving it up to be just after react and react-dom and before your styled-components script.