applying transfer to react app

node_modules/optimize-css-assets-webpack-plugin/test/util/default.css

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+html{display:none}

node_modules/optimize-css-assets-webpack-plugin/test/util/helpers.js

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+import fs from "fs";
+import path from "path";
+import ExtractTextPlugin from "extract-text-webpack-plugin";
+
+export function readFileOrEmpty(path) {
+  try {
+    return fs.readFileSync(path, "utf-8");
+  } catch (e) {
+    return "";
+  }
+}
+
+export const defaultConfig = {
+  entry: "./index",
+  module: {
+    rules: [
+      {
+        test: /\.css$/,
+        use: ExtractTextPlugin.extract({
+          fallback: { loader: "style-loader" },
+          use: {
+            loader: "css-loader"
+          }
+        })
+      }
+    ]
+  },
+  plugins: [],
+  context: __dirname,
+  output: {
+    filename: "destination.js",
+    path: path.resolve(__dirname, "../", "js", "default-exports")
+  }
+};
+
+export function checkForWebpackErrors({ err, stats, done }) {
+  if (err) return done(err);
+  if (stats.hasErrors()) return done(new Error(stats.toString()));
+}

node_modules/optimize-css-assets-webpack-plugin/test/util/index.js

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+require('./default.css');