remove sass loader and add yarn lock file.

.gitignore

@@ -21,7 +21,6 @@
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
-yarn.lock
 
 # Editor directories and files
 .idea

config/webpack.config.js

@@ -432,51 +432,6 @@ module.exports = function (webpackEnv) {
                 },
               }),
             },
-            // Opt-in support for SASS (using .scss or .sass extensions).
-            // By default we support SASS Modules with the
-            // extensions .module.scss or .module.sass
-            {
-              test: sassRegex,
-              exclude: sassModuleRegex,
-              use: getStyleLoaders(
-                {
-                  importLoaders: 3,
-                  sourceMap: isEnvProduction && shouldUseSourceMap,
-                },
-                {
-                  loader: "sass-loader",
-                  options: {
-                    sourceMap: true,
-                  },
-                }
-              ),
-              // Don't consider CSS imports dead code even if the
-              // containing package claims to have no side effects.
-              // Remove this when webpack adds a warning or an error for this.
-              // See https://github.com/webpack/webpack/issues/6571
-              sideEffects: true,
-            },
-            // Adds support for CSS Modules, but using SASS
-            // using the extension .module.scss or .module.sass
-            {
-              test: sassModuleRegex,
-              use: getStyleLoaders(
-                {
-                  importLoaders: 3,
-                  sourceMap: isEnvProduction && shouldUseSourceMap,
-                  modules: {
-                    getLocalIdent: getCSSModuleLocalIdent,
-                  },
-                },
-                {
-                  loader: "sass-loader",
-                  options: {
-                    sourceMap: true,
-                  },
-                }
-              ),
-            },
-
             // less-loader by zicla
             {
               test: lessRegex,

package.json

@@ -90,7 +90,6 @@
     "prettier": "^2.0.5",
     "resolve": "1.15.0",
     "resolve-url-loader": "3.1.1",
-    "sass-loader": "8.0.2",
     "style-loader": "0.23.1",
     "terser-webpack-plugin": "2.3.5",
     "typescript": "~3.7.2",