Use require('resize-observer-polyfill').default || require('resize-observer-polyfill')

> I think we need to do: require('resize-observer-polyfill').default || require('resize-observer-polyfill'), to support both the transpiled version of its ES module format and its CommonJS format. A bit like we did here (although for a different related reason): https://github.com/transloadit/uppy/blob/4684a3e1f3bb43ed59c4ffcda73093cdbe1ddf0d/packages/%40uppy/form/src/index.js#L3-L5

packages/@uppy/dashboard/src/index.js

@@ -8,7 +8,7 @@ const ThumbnailGenerator = require('@uppy/thumbnail-generator')
 const findAllDOMElements = require('@uppy/utils/lib/findAllDOMElements')
 const toArray = require('@uppy/utils/lib/toArray')
 const prettyBytes = require('prettier-bytes')
-const ResizeObserver = require('resize-observer-polyfill')
+const ResizeObserver = require('resize-observer-polyfill').default || require('resize-observer-polyfill')
 const { defaultTabIcon } = require('./components/icons')
 
 // Some code for managing focus was adopted from https://github.com/ghosh/micromodal