To reproduce, in any JavaScript file: ```js require('./foo.json'); ``` As there is no loader configured for `.json` files, you'll get an error: > This relative module was not found: > * ./foo.json in ./app/Resources/assets/js/app.js This makes it appear that the file wasn't found. The bug is actually inside of friendly-errors-webpack-plugin: https://github.com/geowarin/friendly-errors-webpack-plugin/pull/32