omit JS code in bundle, add note about extraction

Author: sokra

src/index.js

@@ -3,7 +3,7 @@ import path from 'path';
 import webpack from 'webpack';
 import sources from 'webpack-sources';
 
-const { RawSource, ConcatSource } = sources;
+const { ConcatSource } = sources;
 const { Template } = webpack;
 
 const NS = path.dirname(fs.realpathSync(__filename));
@@ -38,10 +38,7 @@ class CssModule extends webpack.Module {
     this.sourceMap = dependency.sourceMap;
   }
 
-  source() {
-    // TODO add webpack support for omitting js source
-    return new RawSource('// extracted by mini-css-extract-plugin');
-  }
+  // no source() so webpack doesn't do add stuff to the bundle
 
   size() {
     return 0;

src/loader.js

@@ -107,7 +107,7 @@ export function pitch(request) {
     } catch (e) {
       return callback(e);
     }
-    let resultSource = '';
+    let resultSource = '// extracted by mini-css-extract-plugin';
     if (text.locals && typeof resultSource !== 'undefined') {
       resultSource = `module.exports = ${JSON.stringify(text.locals)};`;
     }