metalabdesign / css-split-webpack-plugin

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Handle case where there are no source maps.

This turns out to be really hard to do in practice. Generally speaking any time you use `ExtractTextPlugin` you get a `ConcatSource` which always has `sourceAndMap` available. The only case you don't get a source map is when another plugin generates a CSS file that uses `RawSource` or something similar. One such plugin is `optimize-css-assets-webpack-plugin` when you don't tell the CSS processor to generate a source map (e.g. `cssProcessorOptions` has no `map` entry).

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