Could not freeze filename

[mitrey]

Recently I've updated Next to version 7 and now when i run "npm run dev" and start changing and saving my files I see notifications in console "Could not freeze ./pages/_app.js: Cannot read property hash of undefined".

The same notification are about several another files. What does it mean?

[danielr18]

It has happened to me, deleting the cache solved it.

rm -rf node_modules/.cache

[mitrey]

@danielr18 thank you. It works for me.
Why did this happen after update to version 7?

[tusbar]

Related to #5213

[timneutkens]

Will probably be fixed when mzgoddard/hard-source-webpack-plugin/pull/419 lands

[timneutkens]

Closing this as we removed hard-source due to above issues.