feature #603 Allow to configure the resolve-url-loader (diegocardoso93, Diego)

This PR was merged into the master branch.

Discussion
----------

Allow to configure the resolve-url-loader

This PR solve the error below, occuring on some cases:
```
Error: resolve-url-loader: CSS error
  source-map information is not available at url() declaration (found orphan CR, try removeCR option)
```
See discussion: bholloway/resolve-url-loader#107

Commits
-------

b7c7e66 Add documentation for resolveUrlLoaderOptions
4671016 Fix lint job
392d32b Merge branch 'master' of https://github.com/diegocardoso93/webpack-encore
a52bb05 Add optional resolve-url-loader options
01e1da7 Add optional resolve-url-loader options
906ae9b Fix "found orphan CR, try removeCR option"
988e5d1 Update resolve-url-loader to v3.1.0

Author: weaverryan

index.js

@@ -754,6 +754,9 @@ class Encore {
      *              when disabled, all url()'s are resolved relative
      *              to the original entry file... not whatever file
      *              the url() appears in.
+     *      * {object} resolveUrlLoaderOptions (default={})
+     *              Options parameters for resolve-url-loader
+     *              // https://www.npmjs.com/package/resolve-url-loader#options
      *
      * @param {function} sassLoaderOptionsCallback
      * @param {object} encoreOptions

lib/WebpackConfig.js

@@ -115,7 +115,8 @@ class WebpackConfig {
         // Features/Loaders options
         this.copyFilesConfigs = [];
         this.sassOptions = {
-            resolveUrlLoader: true
+            resolveUrlLoader: true,
+            resolveUrlLoaderOptions: {}
         };
         this.preactOptions = {
             preactCompat: false

lib/loaders/sass.js

@@ -30,9 +30,12 @@ module.exports = {
             // entry file, not the file that contains the url()
             sassLoaders.push({
                 loader: 'resolve-url-loader',
-                options: {
-                    sourceMap: webpackConfig.useSourceMaps
-                }
+                options: Object.assign(
+                    {
+                        sourceMap: webpackConfig.useSourceMaps
+                    },
+                    webpackConfig.sassOptions.resolveUrlLoaderOptions
+                )
             });
         }
 

test/loaders/sass.js

@@ -65,6 +65,26 @@ describe('loaders/sass', () => {
         cssLoader.getLoaders.restore();
     });
 
+    it('getLoaders() with resolve-url-loader options', () => {
+        const config = createConfig();
+        config.enableSassLoader(() => {}, {
+            resolveUrlLoaderOptions: {
+                removeCR: true
+            }
+        });
+
+        // make the cssLoader return nothing
+        sinon.stub(cssLoader, 'getLoaders')
+            .callsFake(() => []);
+
+        const actualLoaders = sassLoader.getLoaders(config);
+        expect(actualLoaders).to.have.lengthOf(2);
+        expect(actualLoaders[0].loader).to.equal('resolve-url-loader');
+        expect(actualLoaders[0].options.removeCR).to.be.true;
+
+        cssLoader.getLoaders.restore();
+    });
+
     it('getLoaders() without resolve-url-loader', () => {
         const config = createConfig();
         config.enableSassLoader(() => {}, {