ReferenceError: undefinedcreateProvider is not defined

Question

I have a problem with my react project. after 5 months of developing this project, I get this error a lot. undefinedcreateProvider is not defined and I have to reinstall node_modules. But I get this error again after a few changes in the project. I don't know why this error appears!

Answer 1

I had the same issue and also important to notice that I use hard-source-webpack-plugin. There are two ways to solve this problem (at least for me):

1. Downgrade webpack to v4.18.1; or
2. Disable hard-source-webpack-plugin in webpack config, though the webpack builds are slower now.

Deleting .cache folder didn't help me.