CSS urls are broken when using sourcemaps

[filipesilva]

Fixing sourcemaps for global css in #4222 introduced a new bug due to webpack/css-loader#232.

While --sourcemap is enabled (default for dev) and --extract-css is disabled (default for dev), urls in css can become incorrect. See webpack/css-loader#232 for more details.

Temporary workaround is to serve with either --no-sourcemap or --extract-css.

[filipesilva]

The note on style-loader might be the real issue here: https://github.com/webpack-contrib/style-loader#recommended-configuration

Note about source maps support and assets referenced with url: when style loader is used with ?sourceMap option, the CSS modules will be generated as Blobs, so relative paths don't work (they would be relative to chrome:blob or chrome:devtools). In order for assets to maintain correct paths setting output.publicPath property of webpack configuration must be set, so that absolute paths are generated.

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