Added the possibility to configure the StyleLoader via the method Enc…

index.js

@@ -965,6 +965,27 @@ class Encore {
         return this;
     }
 
+    /**
+     * Configure the style-loader.
+     *
+     * https://github.com/webpack-contrib/style-loader#Options
+     *
+     * ```
+     * Encore.configureStyleLoader(function(config) {
+     *     // change the config
+     *     // config.injectType = 'styleTag';
+     * });
+     * ```
+     *
+     * @param {function} callback
+     * @returns {Encore}
+     */
+    configureStyleLoader(callback) {
+        webpackConfig.configureStyleLoader(callback);
+
+        return this;
+    }
+
     /**
      * If enabled, the react preset is added to Babel.
      *

lib/WebpackConfig.js

@@ -142,6 +142,7 @@ class WebpackConfig {
         this.babelConfigurationCallback = () => {};
         this.babelPresetEnvOptionsCallback = () => {};
         this.cssLoaderConfigurationCallback = () => {};
+        this.styleLoaderConfigurationCallback = () => {};
         this.splitChunksConfigurationCallback = () => {};
         this.watchOptionsConfigurationCallback = () => {};
         this.devServerOptionsConfigurationCallback = () => {};
@@ -468,6 +469,14 @@ class WebpackConfig {
         this.cssLoaderConfigurationCallback = callback;
     }
 
+    configureStyleLoader(callback) {
+        if (typeof callback !== 'function') {
+            throw new Error('Argument 1 to configureStyleLoader() must be a callback function.');
+        }
+
+        this.styleLoaderConfigurationCallback = callback;
+    }
+
     enableSingleRuntimeChunk() {
         this.shouldUseSingleRuntimeChunk = true;
     }

lib/loaders/css-extract.js

@@ -11,6 +11,7 @@
 
 const WebpackConfig = require('../WebpackConfig'); //eslint-disable-line no-unused-vars
 const MiniCssExtractPlugin = require('mini-css-extract-plugin');
+const applyOptionsCallback = require('../utils/apply-options-callback');
 
 module.exports = {
     /**
@@ -22,13 +23,17 @@ module.exports = {
      */
     prependLoaders(webpackConfig, loaders) {
         if (!webpackConfig.extractCss) {
+
+            const options = {
+                sourceMap: webpackConfig.useSourceMaps,
+            };
+
             // If the CSS extraction is disabled, use the
             // style-loader instead.
             return [{
                 loader: 'style-loader',
-                options: {
-                    sourceMap: webpackConfig.useSourceMaps,
-                }
+                options: applyOptionsCallback(webpackConfig.styleLoaderConfigurationCallback, options)
+
             }, ...loaders];
         }