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

See original GitHub issue

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)

Issue Analytics

State:
Created 5 years ago
Comments:15 (5 by maintainers)

Top GitHub Comments

7reactions

Dodie324commented, Nov 7, 2018

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

5reactions

danjumamilhauscommented, 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.

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