It is not an answer to this question, but i believe my answer can help some people.
This is due to the settings of chrome, for example in FF this error warnings not happens.
To fix it go to Developer Tools Settings of Chrome, and uncheck:
- “Enable JavaScript source maps”
- “Enable CSS source maps”
Then refresh Chrome.
In order to debug js and scss minified files, this tells the compiler where the source file is actually mapped.
Using last versions of Webpack source-map work well,
I tried to reproduce this bug, but without possibility to run a project, i can’t see what a problem of author of a question.
This warning happening for example using angular, and sourceMap should be set true in angular.json, or other way if you don’t use source-map’ing’ and you don’t want see this warning disable it in browser following my answer.