rxjs 6 requires directory imports which are not support in ES modules. Disabling `fullySpecified` allows Webpack to ignore cases such as this until the package can be updated to use package exports.
With Webpack 5, the `raw-loader` is no longer needed and its functionality is provided via configuration options within the Webpack configuration via asset modules. Asset modules (https://webpack.js.org/guides/asset-modules/) provide a built-in way to provide `raw-loader`, `url-loader`, and `file-loader` functionality without additional dependencies.
