react-dates: Uncaught TypeError: Super expression must either be null or a function, not undefined

Getting error this in a production environment, while local dev works without issues. Using react-dates ~~18.2.0~~ 18.2.1

Uncaught TypeError: Super expression must either be null or a function, not undefined
    at withStyles.js:44
    at withStyles.js:44
    at withStyles.js:158
    at Object.<anonymous> (CalendarDay.js:276)
    at o (bootstrap:78)
    at Object.<anonymous> (index.js:207)
    at o (bootstrap:78)
    at Object.<anonymous> (index.js:2)
    at o (bootstrap:78)
    at Object.<anonymous> (sn.hd.product.js:53)

About this issue

Original URL
State: closed
Created 6 years ago
Comments: 15 (5 by maintainers)

Most upvoted comments

We’re also experiencing this error in our application code base.

Dodie324 on Nov 7, 2018

So, I seem to have solved this in our case at least.

In our production webpack task, we are using the uglify-webpackjs-plugin.

Adding the lines:

uglifyOptions: {
  keep_fnames: true
},

keep this error from happening in that environment.

Possibly some food for thought on why this issue is happening in the future.

danjumamilhaus on Nov 7, 2018

Ultimately, upgrading uglifyjs-webpack-plugin to v2.0.1 from v1.2.7 solved this issue. Found the info I needed starting here: https://github.com/facebook/react/issues/13987#issuecomment-436509006 in case some lone traveler is interested.

danjumamilhaus on Nov 7, 2018

It’s excluded from babel.

danjumamilhaus on Nov 7, 2018